{"id":769,"date":"2026-10-02T13:11:11","date_gmt":"2026-10-02T11:11:11","guid":{"rendered":"https:\/\/www.valfonta.com\/valvules-alleujament-de-pressio\/"},"modified":"2026-10-20T10:18:58","modified_gmt":"2026-10-20T08:18:58","slug":"valvules-alleujament-de-pressio","status":"publish","type":"page","link":"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/","title":{"rendered":"V\u00e0lvules d'alleujament de pressi\u00f3"},"content":{"rendered":"<div class=\"wp-block-group vf-raiz vf-pl-hub is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-cat-wrap is-layout-flow wp-block-group-is-layout-flow\"><article class=\"wp-block-group vf-pdp vf-cat vf-c2 is-layout-flow wp-block-group-is-layout-flow\"><nav class=\"wp-block-group vf-breadcrumbs vfa-aria-label--Ruta%20de%20navegaci%C3%B3 is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"\/ca\/\">Inici<\/a><span class=\"vf-sep\">\u203a<\/span><span aria-current=\"page\">V\u00e0lvules d'alleujament de pressi\u00f3<\/span><\/p><\/nav><div class=\"wp-block-group vf-cat-hero vf-c2-hero is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-pdp-eyebrow wp-block-paragraph\">Disseny i fabricaci\u00f3 a Badalona des de 1962<\/p><h1 class=\"wp-block-heading\">V\u00e0lvules d'alleujament de pressi\u00f3<\/h1><p class=\"vf-lead wp-block-paragraph\">Mantenen la pressi\u00f3 aig\u00fces amunt al valor de tarat: quan se supera, s'obren en proporci\u00f3 a l'augment i descarreguen l'exc\u00e9s, sense energia auxiliar. Tamb\u00e9 s'anomenen <strong>v\u00e0lvules d'exc\u00e9s de pressi\u00f3<\/strong>. Sis models de molla, pist\u00f3, membrana o manxa per a vapor, aigua, oli, aire comprimit i gasos.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Di\u00e0metres<\/span><b>DN15 a DN150<\/b><\/li><li><span>Pressi\u00f3 de tarat<\/span><b>0,01 a 20 barg<\/b><\/li><li><span>Pressi\u00f3 nominal<\/span><b>PN25 \u2013 PN40<\/b><\/li><li><span>Temperatura<\/span><b>fins a 220 \u00b0C<\/b><\/li><\/ul><div class=\"wp-block-group vf-pdp-cta is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Sol\u00b7licitar oferta<\/a><a class=\"vf-btn vf-btn--sec\" href=\"#modelos\" data-vf-view-go=\"table\">Comparar models<\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">T\u00e9 dubtes sobre el tarat o sobre el model? Truqui al <a href=\"tel:+34933720888\">933 720 888<\/a> o escrigui a <a href=\"mailto:valfonta@valfonta.com\">valfonta@valfonta.com<\/a>.<\/p><\/div><div class=\"wp-block-group vf-c2-finder vfa-role--group vfa-aria-labelledby--vf-c2-fh is-layout-flow wp-block-group-is-layout-flow\"><p id=\"vf-c2-fh\" class=\"vf-fh wp-block-paragraph\">Trobi la seva v\u00e0lvula d'alleujament<\/p><div class=\"wp-block-group vf-grp is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-lab\">Fluid<\/span><\/p><div class=\"wp-block-group vf-chips is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"fl\" data-v=\"vapor\" aria-pressed=\"false\">Vapor<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"fl\" data-v=\"liq\" aria-pressed=\"false\">Aigua i l\u00edquids<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"fl\" data-v=\"gas\" aria-pressed=\"false\">Aire i gasos<\/button><\/p><\/div><\/div><div class=\"wp-block-group vf-grp is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-lab\">Pressi\u00f3 de tarat<\/span><\/p><div class=\"wp-block-group vf-chips is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"p\" data-v=\"0-0.5\" data-m=\"s\" aria-pressed=\"false\">Menys de 0,5 barg<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"p\" data-v=\"0.5-10\" data-m=\"s\" aria-pressed=\"false\">0,5 a 10 barg<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"p\" data-v=\"10-20\" data-m=\"s\" aria-pressed=\"false\">M\u00e9s de 10 barg<\/button><\/p><\/div><\/div><div class=\"wp-block-group vf-grp is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-lab\">Di\u00e0metre<\/span><\/p><div class=\"wp-block-group vf-chips is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"dn\" data-v=\"0-25\" aria-pressed=\"false\">Fins a DN25<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"dn\" data-v=\"32-50\" aria-pressed=\"false\">DN32 a DN50<\/button><button type=\"button\" class=\"vf-chip\" data-vf-filter=\"dn\" data-v=\"65-150\" aria-pressed=\"false\">DN65 a DN150<\/button><\/p><\/div><\/div><div class=\"wp-block-group vf-fbar is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--pri\" href=\"#modelos\"><span>Veure <b data-vf-count=\"\">6<\/b> <span data-vf-count-txt=\"\" data-one=\"model\" data-many=\"models\">models<\/span><\/span><\/a><button type=\"button\" class=\"vf-reset\" data-vf-reset=\"\" hidden>Treure filtres<\/button><\/p><\/div><\/div><\/div><ul class=\"vf-pdp-trust wp-block-list\"><li>Disseny i fabricaci\u00f3 pr\u00f2pies a Badalona<\/li><li>Tarats des de 10 mbar fins a 20 barg<\/li><li>Sense energia auxiliar: funcionen amb el mateix fluid<\/li><li>Recanvis originals per a cada model<\/li><\/ul><nav class=\"wp-block-group vf-pdp-nav vfa-aria-label--Contingut%20de%20la%20fitxa is-layout-flow wp-block-group-is-layout-flow\"><ul class=\"wp-block-list\"><li><a href=\"#modelos\">Models<\/a><\/li><li><a href=\"#como-funciona\">Com funciona<\/a><\/li><li><a href=\"#diferencias\">Alleujament, seguretat o reductora<\/a><\/li><li><a href=\"#aplicaciones\">Aplicacions<\/a><\/li><li><a href=\"#preguntas\">Preguntes<\/a><\/li><li><a href=\"#solicitar\">Sol\u00b7licitar oferta<\/a><\/li><\/ul><\/nav><section id=\"modelos\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Models de v\u00e0lvules d'alleujament de pressi\u00f3<\/h2><p class=\"vf-c2-intro wp-block-paragraph\">Filtri amb el cercador de la cap\u00e7alera o canvi\u00ef a la taula comparativa. Cada fitxa t\u00e9 les especificacions completes, l'especejament, la instal\u00b7laci\u00f3 i els PDF.<\/p><div class=\"wp-block-group vf-c2-bar is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-count vfa-aria-live--polite wp-block-paragraph\"><b data-vf-count=\"\">6<\/b> <span data-vf-count-txt=\"\" data-one=\"model\" data-many=\"models\" data-fit=\"1\">models<\/span><\/p><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" class=\"vf-reset\" data-vf-reset=\"\" hidden>Treure filtres<\/button><\/p><div class=\"wp-block-group vf-view vfa-role--tablist vfa-aria-label--Vista is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" role=\"tab\" aria-selected=\"true\" data-vf-view=\"cards\">Targetes<\/button><button type=\"button\" role=\"tab\" aria-selected=\"false\" data-vf-view=\"table\">Taula comparativa<\/button><\/p><\/div><\/div><div class=\"wp-block-group vf-c2-cardsview is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-c2-group vfd-group--pequenas is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-ghead is-layout-flow wp-block-group-is-layout-flow\"><h3 class=\"wp-block-heading\">L\u00ednies petites: DN15 a DN25<\/h3><p class=\"wp-block-paragraph\">Compactes i d'acer inoxidable 316L, amb rosca o brides. Tarats des de 10 mbar (PRV55) fins a 12 barg (PRV54).<\/p><\/div><div class=\"wp-block-group vf-c2-cards vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--liq%20gas vfd-pmin--0.5 vfd-pmax--10 vfd-dnmin--15 vfd-dnmax--25 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 PRV53 d&#x27;acer inoxidable 316L amb connexi\u00f3 roscada\" class=\"wp-image-181\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Pist\u00f3<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'exc\u00e9s de pressi\u00f3 de pist\u00f3, en acer inoxidable 316L.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,5 a 10 barg <small>15 sota consulta<\/small><\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN25<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">fins a 150 \u00b0C <small>segons les juntes<\/small><\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">No<\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> treballa amb aigua, fuel-oil, aire comprimit, nitrogen o altres gasos neutres.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula PRV53\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--vapor%20liq%20gas vfd-pmin--0.5 vfd-pmax--12 vfd-dnmin--15 vfd-dnmax--25 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 PRV54 d&#x27;acer inoxidable 316L amb manxa, per a vapor\" class=\"wp-image-181\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Manxa \u00b7 vapor<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'exc\u00e9s de pressi\u00f3 equilibrada per manxa, en acer inoxidable 316L.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,5 a 12 barg<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN25<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">fins a 210 \u00b0C <small>segons les juntes<\/small><\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">S\u00ed<\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> el fluid \u00e9s vapor, o l\u00edquids i gasos per sobre de 150 \u00b0C.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula PRV54\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--vapor%20liq%20gas vfd-pmin--0.01 vfd-pmax--8 vfd-dnmin--15 vfd-dnmax--25 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV45-55-700x700-1.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 PRV55 amb actuador de membrana i cos d&#x27;acer inoxidable 316L\" class=\"wp-image-191\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Membrana \u00b7 baixa pressi\u00f3<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'exc\u00e9s de pressi\u00f3 de membrana, en acer inoxidable 316L.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,01 a 8 barg<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN25<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">\u221210 a 150 \u00b0C <small>amb juntes de Viton<\/small><\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">S\u00ed<\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> necessita tarats molt baixos, des de 10 mbar, en gasos, l\u00edquids o vapor.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula PRV55\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-group vfd-group--grandes is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-ghead is-layout-flow wp-block-group-is-layout-flow\"><h3 class=\"wp-block-heading\">L\u00ednies mitjanes i grans: fins a DN150<\/h3><p class=\"wp-block-paragraph\">Cos d'acer al carboni o inox CF3M, amb brides EN o ANSI; sota comanda, bronze, d\u00faplex o superd\u00faplex.<\/p><\/div><div class=\"wp-block-group vf-c2-cards vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--vapor%20liq%20gas vfd-pmin--0.5 vfd-pmax--20 vfd-dnmin--15 vfd-dnmax--150 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva-400.webp\" alt=\"V\u00e0lvula d&#x27;alleujament de pressi\u00f3 S3 de Valfonta amb c\u00e0rrega per molla i connexi\u00f3 per brides\" class=\"wp-image-10230\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Molla \u00b7 acci\u00f3 directa<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\">S3<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'alleujament d'acci\u00f3 directa, amb obturador guiat i tancament classe IV o VI. Homologada per a protecci\u00f3 contra incendis.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,5 a 20 barg<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN150 <small>DN125\u2013150 sota consulta<\/small><\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">fins a 220 \u00b0C<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">S\u00ed<\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> busca una v\u00e0lvula d'acci\u00f3 directa, sense membrana ni canonada de comandament, fins a 20 barg; per exemple, al bypass d'una bomba.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula S3\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--vapor%20liq%20gas vfd-pmin--0.5 vfd-pmax--15 vfd-dnmin--15 vfd-dnmax--150 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 S1 de Valfonta amb actuador de membrana i connexi\u00f3 per brides\" class=\"wp-image-192\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Membrana i manxa<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-exces-de-pressio\/\">S1<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'exc\u00e9s de pressi\u00f3 de globus, amb membrana, fins a DN150 i Kv de 240 m\u00b3\/h.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,5 a 15 barg<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN150<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">fins a 220 \u00b0C<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">S\u00ed <small>amb tanc de condensaci\u00f3<\/small><\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> necessita grans cabals, fins a DN150, o vapor fins a 220 \u00b0C.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-exces-de-pressio\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula S1\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-card vfd-vf-item--p vfd-fl--vapor%20liq%20gas vfd-pmin--0.02 vfd-pmax--10 vfd-dnmin--15 vfd-dnmax--100 vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-img is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><a href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2-PROVISIONAL-700x700-1.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 S2 de Valfonta amb actuador de membrana i connexi\u00f3 per brides\" class=\"wp-image-193\" width=\"160\" height=\"160\" loading=\"lazy\"><\/a><\/figure><\/div><div class=\"wp-block-group vf-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-tag wp-block-paragraph\">Membrana \u00b7 presa interna<\/p><h3 class=\"wp-block-heading\"><a href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a><\/h3><p class=\"vf-sub wp-block-paragraph\">V\u00e0lvula d'exc\u00e9s de pressi\u00f3 de membrana, amb tancament equilibrat per \u00e8mbol.<\/p><div class=\"wp-block-group vf-t-dl is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Tarat<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">0,02 a 10 barg<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Di\u00e0metre<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">DN15 a DN100<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Temperatura<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">fins a 180 \u00b0C<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t-dt vf-p0 wp-block-paragraph\">Vapor<\/p><p class=\"vf-t-dd vf-p0 wp-block-paragraph\">A baixa temperatura <small>amb presa externa<\/small><\/p><\/div><\/div><p class=\"vf-fit wp-block-paragraph\"><b>Tri\u00ef-la si<\/b> necessita tarats baixos, des de 0,02 barg, en gasos, aire comprimit o l\u00edquids, sense canonada de comandament.<\/p><div class=\"wp-block-group vf-act is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">Veure fitxa<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\" data-vf-model=\"V\u00e0lvula S2\">Demanar oferta<\/a><\/p><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"wp-block-group vf-c2-table vfa-hidden-- is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\"><button type=\"button\" data-vf-sort=\"0\" data-type=\"t\">Model<\/button><\/th><th scope=\"col\"><button type=\"button\" data-vf-sort=\"1\" data-type=\"t\">Construcci\u00f3<\/button><\/th><th scope=\"col\"><button type=\"button\" data-vf-sort=\"2\" data-type=\"n\">DN<\/button><\/th><th scope=\"col\"><button type=\"button\" data-vf-sort=\"3\" data-type=\"n\">Tarat (barg)<\/button><\/th><th scope=\"col\"><button type=\"button\" data-vf-sort=\"4\" data-type=\"n\">T. m\u00e0x. (\u00b0C)<\/button><\/th><th scope=\"col\"><button type=\"button\" data-vf-sort=\"5\" data-type=\"n\">Vapor<\/button><\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"liq gas\" data-pmin=\"0.5\" data-pmax=\"10\" data-dnmin=\"15\" data-dnmax=\"25\"><\/span><span class=\"vf-dato\" hidden data-s=\"PRV53\"><\/span><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Pist\u00f3\"><\/span>Pist\u00f3<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 25<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.5\"><\/span>0,5 \u2013 10<\/td><td><span class=\"vf-dato\" hidden data-s=\"150\"><\/span>150<\/td><td><span class=\"vf-dato\" hidden data-s=\"0\"><\/span>No<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.5\" data-pmax=\"12\" data-dnmin=\"15\" data-dnmax=\"25\"><\/span><span class=\"vf-dato\" hidden data-s=\"PRV54\"><\/span><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Manxa\"><\/span>Manxa<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 25<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.5\"><\/span>0,5 \u2013 12<\/td><td><span class=\"vf-dato\" hidden data-s=\"210\"><\/span>210<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.01\" data-pmax=\"8\" data-dnmin=\"15\" data-dnmax=\"25\"><\/span><span class=\"vf-dato\" hidden data-s=\"PRV55\"><\/span><a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Membrana\"><\/span>Membrana<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 25<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.01\"><\/span>0,01 \u2013 8<\/td><td><span class=\"vf-dato\" hidden data-s=\"150\"><\/span>150<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.5\" data-pmax=\"20\" data-dnmin=\"15\" data-dnmax=\"150\"><\/span><span class=\"vf-dato\" hidden data-s=\"S3\"><\/span><a href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\">S3<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Molla\"><\/span>Molla<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 150<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.5\"><\/span>0,5 \u2013 20<\/td><td><span class=\"vf-dato\" hidden data-s=\"220\"><\/span>220<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.5\" data-pmax=\"15\" data-dnmin=\"15\" data-dnmax=\"150\"><\/span><span class=\"vf-dato\" hidden data-s=\"S1\"><\/span><a href=\"\/ca\/producte\/valvula-exces-de-pressio\/\">S1<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Membrana i manxa\"><\/span>Membrana i manxa<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 150<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.5\"><\/span>0,5 \u2013 15<\/td><td><span class=\"vf-dato\" hidden data-s=\"220\"><\/span>220<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.02\" data-pmax=\"10\" data-dnmin=\"15\" data-dnmax=\"100\"><\/span><span class=\"vf-dato\" hidden data-s=\"S2\"><\/span><a href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a><\/th><td><span class=\"vf-dato\" hidden data-s=\"Membrana\"><\/span>Membrana<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 100<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.02\"><\/span>0,02 \u2013 10<\/td><td><span class=\"vf-dato\" hidden data-s=\"180\"><\/span>180<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-item=\"t\" data-fl=\"vapor liq gas\" data-pmin=\"0.5\" data-pmax=\"20\" data-dnmin=\"15\" data-dnmax=\"100\"><\/span><span class=\"vf-dato\" hidden data-s=\"S4\"><\/span>S4*<\/th><td><span class=\"vf-dato\" hidden data-s=\"Pist\u00f3\"><\/span>Pist\u00f3<\/td><td><span class=\"vf-dato\" hidden data-s=\"15\"><\/span>15 \u2013 100<\/td><td><span class=\"vf-dato\" hidden data-s=\"0.5\"><\/span>0,5 \u2013 20<\/td><td><span class=\"vf-dato\" hidden data-s=\"220\"><\/span>220<\/td><td><span class=\"vf-dato\" hidden data-s=\"1\"><\/span>S\u00ed<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Dades del cat\u00e0leg resum d'exc\u00e9s de pressi\u00f3 de Valfonta (2025); tarat de la S2 segons la seva fitxa t\u00e8cnica. Tots admeten aigua, oli, aire i gasos no inflamables. * La S4 no t\u00e9 fitxa al web: consulti'ns. S3: DN125 i DN150, sota consulta. PRV53: fins a 15 barg sota consulta.<\/p><\/div><div class=\"wp-block-group vf-c2-empty vfa-hidden-- is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\"><b>Cap model est\u00e0ndard no encaixa amb aquests filtres.<\/b> Valfonta adapta models i dissenya v\u00e0lvules a mida: expliqui'ns la seva aplicaci\u00f3 al <a href=\"#solicitar\" data-vf-model=\"No ho s\u00e9 \/ necessito assessorament\">formulari<\/a> o vegi el <a href=\"\/ca\/disseny-de-valvules-de-control\/\">servei de disseny a mida<\/a>.<\/p><\/div><\/section><section id=\"como-funciona\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Com funciona i on s'instal\u00b7la<\/h2><div class=\"wp-block-group vf-c2-how is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-txt is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Una v\u00e0lvula d'alleujament de pressi\u00f3 roman tancada mentre la pressi\u00f3 d'entrada \u00e9s per sota del valor de tarat. Quan el supera, s'obre de manera gradual, en proporci\u00f3 a l'augment de pressi\u00f3, descarrega el cabal sobrant i torna a tancar-se quan la pressi\u00f3 es normalitza. Aix\u00ed mant\u00e9 estable la pressi\u00f3 aig\u00fces amunt.<\/p><p class=\"wp-block-paragraph\">Totes s\u00f3n <strong>autoaccionades<\/strong>: una molla de regulaci\u00f3 s'oposa a la pressi\u00f3 d'entrada, sense aire, electricitat ni sistema de control. El valor de tarat es fixa amb la compressi\u00f3 de la molla; la S1, la S2 i la S3 es lliuren ajustades al valor demanat.<\/p><p class=\"wp-block-paragraph\">El muntatge t\u00edpic \u00e9s en una derivaci\u00f3, per exemple al bypass d'una bomba, amb retorn a l'aspiraci\u00f3 o al dip\u00f2sit, un filtre al davant i un man\u00f2metre aig\u00fces amunt. Vegi com revisar el tarat i per qu\u00e8 vibra una v\u00e0lvula d'alleujament.<\/p><\/div><div class=\"wp-block-group vf-diagram vf-t-figure is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-svgw is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><svg viewbox=\"0 0 900 240\" role=\"img\" aria-label=\"Esquema d'instal\u00b7laci\u00f3 d'una v\u00e0lvula d'alleujament o d'exc\u00e9s de pressi\u00f3 en derivaci\u00f3\"><path d=\"M20 90 H880\" stroke=\"#9aa0a6\" stroke-width=\"6\" fill=\"none\"><\/path><path d=\"M865 90 l14 0 -10 -7 m10 7 -10 7\" stroke=\"#1e2123\" stroke-width=\"3\" fill=\"none\"><\/path><rect x=\"60\" y=\"62\" width=\"90\" height=\"56\" rx=\"4\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/rect><circle cx=\"105\" cy=\"90\" r=\"16\" fill=\"none\" stroke=\"#1e2123\" stroke-width=\"2\"><\/circle><path d=\"M97 90 l18 0\" stroke=\"#1e2123\" stroke-width=\"2\"><\/path><path d=\"M420 90 V150\" stroke=\"#9aa0a6\" stroke-width=\"5\"><\/path><rect x=\"385\" y=\"150\" width=\"70\" height=\"46\" rx=\"4\" fill=\"#fdecf1\" stroke=\"#e6305d\" stroke-width=\"2\"><\/rect><path d=\"M420 160 v24 m-7 -8 7 8 7 -8\" stroke=\"#e6305d\" stroke-width=\"2.5\" fill=\"none\"><\/path><path d=\"M455 173 H640 V215\" stroke=\"#9aa0a6\" stroke-width=\"5\" fill=\"none\"><\/path><path d=\"M632 205 l8 12 8 -12\" stroke=\"#1e2123\" stroke-width=\"2.5\" fill=\"none\"><\/path><g><circle cx=\"300\" cy=\"51\" r=\"13\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/circle><line x1=\"300\" y1=\"64\" x2=\"300\" y2=\"90\" stroke=\"#1e2123\" stroke-width=\"2\"><\/line><line x1=\"300\" y1=\"51\" x2=\"307\" y2=\"44\" stroke=\"#e6305d\" stroke-width=\"2\"><\/line><\/g><rect x=\"720\" y=\"65\" width=\"110\" height=\"50\" rx=\"4\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/rect><circle cx=\"105\" cy=\"138\" r=\"11\" fill=\"#1e2123\"><\/circle><text x=\"105\" y=\"142\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\" font-family=\"Montserrat,Arial\">1<\/text><circle cx=\"324\" cy=\"38\" r=\"11\" fill=\"#1e2123\"><\/circle><text x=\"324\" y=\"42\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\" font-family=\"Montserrat,Arial\">2<\/text><circle cx=\"420\" cy=\"218\" r=\"11\" fill=\"#e6305d\"><\/circle><text x=\"420\" y=\"222\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\" font-family=\"Montserrat,Arial\">3<\/text><circle cx=\"640\" cy=\"232\" r=\"11\" fill=\"#1e2123\"><\/circle><text x=\"640\" y=\"236\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\" font-family=\"Montserrat,Arial\">4<\/text><circle cx=\"775\" cy=\"136\" r=\"11\" fill=\"#1e2123\"><\/circle><text x=\"775\" y=\"140\" font-size=\"12\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\" font-family=\"Montserrat,Arial\">5<\/text><\/svg><\/p><\/div><div class=\"wp-block-group vf-t-figcaption is-layout-flow wp-block-group-is-layout-flow\"><ol class=\"wp-block-list\"><li>Bomba o equip que genera la pressi\u00f3<\/li><li>Man\u00f2metre aig\u00fces amunt<\/li><li>V\u00e0lvula d'alleujament de pressi\u00f3<\/li><li>Retorn a l'aspiraci\u00f3 o al dip\u00f2sit<\/li><li>L\u00ednia principal cap al consum<\/li><\/ol><\/div><\/div><\/div><\/section><section id=\"diferencias\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Alleujament, seguretat o reductora: quina necessita<\/h2><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-c2-cmp\"><table><thead><tr><th><\/th><th>V\u00e0lvula d'alleujament o d'exc\u00e9s de pressi\u00f3<\/th><th>V\u00e0lvula de seguretat<\/th><th>V\u00e0lvula reductora<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Qu\u00e8 fa<\/th><td>Mant\u00e9 la pressi\u00f3 <strong>aig\u00fces amunt<\/strong> al valor de tarat.<\/td><td>Protegeix dip\u00f2sits, calderes o canonades contra les sobrepressions.<\/td><td>Mant\u00e9 la pressi\u00f3 <strong>aig\u00fces avall<\/strong> al valor ajustat.<\/td><\/tr><tr><th scope=\"row\">Com s'obre<\/th><td>En proporci\u00f3 a l'augment de pressi\u00f3; es tanca quan es normalitza.<\/td><td>En assolir la pressi\u00f3 de tret; les ALPER i JAS, amb obertura total instant\u00e0nia.<\/td><td>Es tanca quan puja la pressi\u00f3 de sortida i s'obre quan baixa.<\/td><\/tr><tr><th scope=\"row\">Tipus d'accessori<\/th><td>Accessori de pressi\u00f3<\/td><td>Accessori de seguretat<\/td><td>Accessori de pressi\u00f3<\/td><\/tr><tr><th scope=\"row\">On va<\/th><td>En derivaci\u00f3, per exemple al bypass d'una bomba.<\/td><td>Sobre l'equip o la l\u00ednia que protegeix.<\/td><td>A la l\u00ednia, abans del consum.<\/td><\/tr><tr><th scope=\"row\">Models<\/th><td>S3, S1, S2, PRV53, PRV54 i PRV55<\/td><td><a href=\"\/ca\/valvules-de-seguretat\/\">V\u00e0lvules de seguretat<\/a><\/td><td><a href=\"\/ca\/valvules-reductores-de-pressio\/\">V\u00e0lvules reductores de pressi\u00f3<\/a><\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"wp-block-paragraph\"><strong>Una v\u00e0lvula d'alleujament no substitueix una v\u00e0lvula de seguretat.<\/strong> Si la instal\u00b7laci\u00f3 necessita protecci\u00f3 contra sobrepressions, cal muntar-les totes dues. Ho expliquem a la difer\u00e8ncia entre v\u00e0lvula de seguretat i d'alleujament.<\/p><\/section><section id=\"aplicaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Aplicacions<\/h2><ul class=\"vf-pdp-apps wp-block-list\"><li><b>Bypass de bombes<\/b><span>Retornen el cabal sobrant a l'aspiraci\u00f3 o al dip\u00f2sit amb la <a href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\">S3<\/a> o la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a>.<\/span><\/li><li><b>Protecci\u00f3 contra incendis<\/b><span>La <a href=\"\/ca\/producte\/valvula-alleujament-de-pressio\/\">S3<\/a> t\u00e9 homologaci\u00f3 espec\u00edfica per a aquestes instal\u00b7lacions; demani'ns el certificat amb l'oferta.<\/span><\/li><li><b>Xarxes de vapor<\/b><span>Xarxes de vapor i intercanviadors de calor, amb la <a href=\"\/ca\/producte\/valvula-exces-de-pressio\/\">S1<\/a>, la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a> o la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a>.<\/span><\/li><li><b>Gasos i aire comprimit<\/b><span>Tarats des de 10 mbar amb la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a> o des de 0,02 barg amb la <a href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a>.<\/span><\/li><li><b>Alimentaci\u00f3 entre zones<\/b><span>Amb la <a href=\"\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a>, una zona amb exc\u00e9s de pressi\u00f3 n'alimenta una altra de menys pressi\u00f3 sense desproveir la l\u00ednia principal.<\/span><\/li><li><b>Laboratoris i plantes sanit\u00e0ries<\/b><span>Circuits petits en acer inoxidable 316L amb la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a>, la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a> o la <a href=\"\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a>.<\/span><\/li><\/ul><\/section><section id=\"normativa\" class=\"wp-block-group vf-c2-norm is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Normativa i certificats<\/h2><div class=\"wp-block-group vf-norm vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>PED 2014\/68\/UE<\/b><\/p><p class=\"wp-block-paragraph\">PRV53, PRV54 i PRV55: article 4.3, sense marcatge CE. S1, S2 i S3: la placa indica si la v\u00e0lvula requereix marcatge CE.<\/p><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>ATEX II 2 GD<\/b><\/p><p class=\"wp-block-paragraph\">S1, S2, PRV53, PRV54 i PRV55 (certificat LOM 14.034 U), per a zones 1, 2, 21 i 22. Per a la S3, consulti'ns.<\/p><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>ISO 9001:2015<\/b><\/p><p class=\"wp-block-paragraph\">Disseny, fabricaci\u00f3 i comercialitzaci\u00f3 de v\u00e0lvules de regulaci\u00f3 de globus per al control de proc\u00e9s.<\/p><\/div><\/div><p class=\"wp-block-paragraph\">Descarregui els <a href=\"\/ca\/certificats\/\">certificats de Valfonta<\/a>.<\/p><\/section><section id=\"preguntas\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Preguntes freq\u00fcents sobre v\u00e0lvules d'alleujament de pressi\u00f3<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Quina difer\u00e8ncia hi ha entre una v\u00e0lvula d&#x27;alleujament i una v\u00e0lvula de seguretat?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">La d'alleujament s'obre en proporci\u00f3 a l'augment de pressi\u00f3 i modula per mantenir la pressi\u00f3 al valor de tarat: \u00e9s un accessori de pressi\u00f3, no de seguretat. La de seguretat protegeix dip\u00f2sits, calderes o canonades contra les sobrepressions. Si necessita protecci\u00f3, munti a m\u00e9s una de les nostres <a href=\"\/ca\/valvules-de-seguretat\/\">v\u00e0lvules de seguretat<\/a>.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>V\u00e0lvula d&#x27;alleujament i v\u00e0lvula d&#x27;exc\u00e9s de pressi\u00f3 s\u00f3n el mateix?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">S\u00ed, compleixen la mateixa funci\u00f3. El cat\u00e0leg de Valfonta les agrupa com a v\u00e0lvules d'exc\u00e9s de pressi\u00f3; a la nostra gamma, la S3 \u00e9s la que s'anomena v\u00e0lvula d'alleujament.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Quina v\u00e0lvula d&#x27;alleujament necessito per a vapor?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">La S3 i la S1 treballen fins a 220 \u00b0C, la PRV54 fins a 210 \u00b0C i la PRV55 fins a 150 \u00b0C; la S2 admet vapor a baixa temperatura amb presa externa i tanc de condensaci\u00f3. La PRV53 no \u00e9s indicada per a vapor.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Quina pressi\u00f3 de tarat es pot ajustar?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Des de 0,01 barg (10 mbar) amb la PRV55 i 0,02 barg amb la S2, fins a 20 barg amb la S3. La S1, la S2 i la S3 es lliuren preajustades al valor demanat.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>On s&#x27;instal\u00b7la una v\u00e0lvula d&#x27;alleujament?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Normalment en una derivaci\u00f3 de la l\u00ednia principal, per exemple al bypass d'una bomba, amb retorn a l'aspiraci\u00f3 o al dip\u00f2sit, amb un filtre al davant i un man\u00f2metre aig\u00fces amunt per comprovar el tarat.<\/p><\/div><\/details><\/section><section id=\"guias\" class=\"wp-block-group vf-c2-more is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-sin-idioma is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"vf-sin-idioma wp-block-heading\">Guies t\u00e8cniques sobre v\u00e0lvules d'alleujament<\/h2><div class=\"wp-block-group vf-arts vf-sin-idioma vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/valvula-de-alivo-como-elegirla\/\">V\u00e0lvula d'alleujament: com triar la correcta<\/a><\/p><\/div><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/diferencia-entre-valvula-de-seguridad-y-de-alivio\/\">Difer\u00e8ncia entre v\u00e0lvula de seguretat i d'alleujament<\/a><\/p><\/div><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/tarado-de-valvulas-de-alivio\/\">Tarat de v\u00e0lvules d'alleujament i auditoria de seguretat<\/a><\/p><\/div><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/chattering-valvulas-alivio\/\">Chattering en v\u00e0lvules d'alleujament: qu\u00e8 \u00e9s?<\/a><\/p><\/div><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/valvula-alivio-presion-agua\/\">V\u00e0lvula d'alleujament per a aigua, vapor i gasos<\/a><\/p><\/div><div class=\"wp-block-group vf-sin-idioma vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a data-vf-href=\"\/blog\/valvulas-de-alivio-de-presion-contra-incendios\/\">V\u00e0lvules d'alleujament de pressi\u00f3 contra incendis<\/a><\/p><\/div><\/div><\/div><p class=\"vf-fams wp-block-paragraph\"><b>Altres fam\u00edlies:<\/b> <a href=\"\/ca\/valvules-de-seguretat\/\">V\u00e0lvules de seguretat<\/a> \u00b7 <a href=\"\/ca\/valvules-reductores-de-pressio\/\">V\u00e0lvules reductores de pressi\u00f3<\/a> \u00b7 <a href=\"\/ca\/valvula-de-control\/\">V\u00e0lvules de control<\/a> \u00b7 <a href=\"\/ca\/disseny-de-valvules-de-control\/\">Disseny a mida<\/a><\/p><\/section><section id=\"solicitar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-quote is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Sol\u00b7liciti oferta d'una v\u00e0lvula d'alleujament de pressi\u00f3<\/h2><p class=\"wp-block-paragraph\">Indiqui'ns les dades de la seva instal\u00b7laci\u00f3 i li recomanarem el model, el di\u00e0metre, el rang de molla i les juntes adequades per a la seva pressi\u00f3 de tarat.<\/p><ul class=\"wp-block-list\"><li>Fluid i temperatura de servei<\/li><li>Pressi\u00f3 de tarat i pressi\u00f3 normal de servei<\/li><li>Cabal que ha de descarregar la v\u00e0lvula<\/li><li>Tipus de connexi\u00f3 (rosca o brides) i material del cos<\/li><\/ul><p class=\"vf-pdp-contact wp-block-paragraph\">Tamb\u00e9 pot trucar al <a href=\"tel:+34933720888\">933 720 888<\/a>.<\/p><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f576-o1\" lang=\"ca\" dir=\"ltr\" data-wpcf7-id=\"576\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/ca\/wp-json\/wp\/v2\/pages\/769#wpcf7-f576-o1\" method=\"post\" class=\"wpcf7-form init vf-form wpcf7-acceptance-as-validation\" aria-label=\"Formulari de contacte\" novalidate=\"novalidate\" data-status=\"init\" toolname=\"solicitar_oferta\" tooldescription=\"Demana a Valfonta una oferta dels models d&#039;aquesta p\u00e0gina (model, di\u00e0metre, fluid i pressions); respon una persona de l&#039;equip.\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"576\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.2.3\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"ca\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f576-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/><input type=\"hidden\" name=\"_vf_t\" value=\"1792703023.0ebb94a4f44ec262\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"V\u00e1lvulas de alivio de presi\u00f3n\" type=\"hidden\" name=\"familia\" \/><label>Nom *<span class=\"wpcf7-form-control-wrap\" data-name=\"nombre\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" autocomplete=\"name\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"nombre\" \/><\/span><\/label><label>Empresa<span class=\"wpcf7-form-control-wrap\" data-name=\"empresa\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" autocomplete=\"organization\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"empresa\" \/><\/span><\/label><label>Correu electr\u00f2nic *<span class=\"wpcf7-form-control-wrap\" data-name=\"email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" autocomplete=\"email\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"email\" name=\"email\" \/><\/span><\/label><label>Tel\u00e8fon<span class=\"wpcf7-form-control-wrap\" data-name=\"telefono\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-text wpcf7-validates-as-tel\" autocomplete=\"tel\" aria-invalid=\"false\" value=\"\" type=\"tel\" name=\"telefono\" \/><\/span><\/label><label class=\"vf-full\">Model<span class=\"wpcf7-form-control-wrap\" data-name=\"modelo\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"modelo\"><option value=\"\">Seleccioni<\/option><option value=\"V\u00e0lvula PRV53\">V\u00e0lvula PRV53<\/option><option value=\"V\u00e0lvula PRV54\">V\u00e0lvula PRV54<\/option><option value=\"V\u00e0lvula PRV55\">V\u00e0lvula PRV55<\/option><option value=\"V\u00e0lvula S3\">V\u00e0lvula S3<\/option><option value=\"V\u00e0lvula S1\">V\u00e0lvula S1<\/option><option value=\"V\u00e0lvula S2\">V\u00e0lvula S2<\/option><option value=\"No ho s\u00e9 \/ necessito assessorament\">No ho s\u00e9 \/ necessito assessorament<\/option><\/select><\/span><\/label><label>Fluid<span class=\"wpcf7-form-control-wrap\" data-name=\"fluido\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"vapor, aigua, aire\u2026\" value=\"\" type=\"text\" name=\"fluido\" \/><\/span><\/label><label>Pressi\u00f3 de tarat (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"tarado\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"tarado\" \/><\/span><\/label><label>Cabal a descarregar<span class=\"wpcf7-form-control-wrap\" data-name=\"caudal\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"p. ex. 5 m\u00b3\/h o kg\/h de vapor\" value=\"\" type=\"text\" name=\"caudal\" \/><\/span><\/label><label>Temperatura (\u00b0C)<span class=\"wpcf7-form-control-wrap\" data-name=\"temperatura\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"temperatura\" \/><\/span><\/label><label class=\"vf-full\">Missatge<span class=\"wpcf7-form-control-wrap\" data-name=\"mensaje\"><textarea cols=\"40\" rows=\"4\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" name=\"mensaje\"><\/textarea><\/span><\/label><label class=\"vf-chk vf-full\"><span class=\"wpcf7-form-control-wrap\" data-name=\"privacidad\"><span class=\"wpcf7-form-control wpcf7-acceptance\"><span class=\"wpcf7-list-item\"><input type=\"checkbox\" name=\"privacidad\" value=\"1\" aria-invalid=\"false\" \/><\/span><\/span><\/span> <span>He llegit i accepto la <a href=\"\/ca\/politica-de-privacitat\/\">pol\u00edtica de privacitat<\/a> *<\/span><\/label><input class=\"wpcf7-form-control wpcf7-submit has-spinner vf-btn vf-btn--pri\" type=\"submit\" value=\"Enviar la sol\u00b7licitud\" \/><span class=\"vf-hp\" aria-hidden=\"true\"><label>Web <input type=\"text\" name=\"vf_web\" value=\"\" tabindex=\"-1\" autocomplete=\"off\" toolparamdescription=\"Campo de control: d\u00e9jalo vac\u00edo\"><\/label><\/span><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n<\/div><\/section><div class=\"wp-block-group vf-pdp-bar is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"tel:+34933720888\">Trucar<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Sol\u00b7licitar oferta<\/a><\/p><\/div><\/article><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Inici\u203aV\u00e0lvules d'alleujament de pressi\u00f3 Disseny i fabricaci\u00f3 a Badalona des de 1962 V\u00e0lvules d'alleujament de pressi\u00f3 Mantenen la pressi\u00f3 aig\u00fces amunt al valor de tarat: quan se supera, s'obren en proporci\u00f3 a l'augment i descarreguen l'exc\u00e9s, sense energia auxiliar. Tamb\u00e9 s'anomenen v\u00e0lvules d'exc\u00e9s de pressi\u00f3. Sis models de molla, pist\u00f3, membrana o manxa per a ... <a title=\"V\u00e0lvules d&#039;alleujament de pressi\u00f3\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/\" aria-label=\"M\u00e9s informaci\u00f3 sobre V\u00e0lvules d&#039;alleujament de pressi\u00f3\">Llegiu m\u00e9s<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"V\u00e0lvules d'alleujament de pressi\u00f3: 6 models | Valfonta","rank_math_description":"V\u00e0lvules d'alleujament de pressi\u00f3 (exc\u00e9s de pressi\u00f3) de Valfonta: 6 models de DN15 a DN150, tarat de 0,01 a 20 barg i fins a 220 \u00b0C. Tri\u00ef i demani oferta.","rank_math_focus_keyword":"","vf_jsonld":"[{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.valfonta.com\/#organization\",\"name\":\"Valfonta\",\"legalName\":\"Val Fonta, S.L.\",\"taxID\":\"B59935718\",\"url\":\"https:\/\/www.valfonta.com\/ca\/\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valfonta-logo.webp\"},\"foundingDate\":\"1962\",\"email\":\"valfonta@valfonta.com\",\"telephone\":\"+34 933 720 888\",\"address\":{\"@type\":\"PostalAddress\",\"streetAddress\":\"C\/ Bronze 26, Pol. Ind. 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Tri\u00ef i demani oferta.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"ca\",\"datePublished\":\"2020-03-11T10:17:12+02:00\",\"dateModified\":\"2026-01-14T01:27:36+02:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/#modelos\"},\"primaryImageOfPage\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-S3-2017.jpg\"}},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Inici\",\"item\":\"https:\/\/www.valfonta.com\/ca\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"V\u00e0lvules d'alleujament de pressi\u00f3\",\"item\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/\"}]},{\"@type\":\"ItemList\",\"@id\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/#modelos\",\"name\":\"V\u00e0lvules d'alleujament de pressi\u00f3\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\",\"name\":\"V\u00e0lvula d'exc\u00e9s de pressi\u00f3 PRV53\"},{\"@type\":\"ListItem\",\"position\":2,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\",\"name\":\"V\u00e0lvula d'exc\u00e9s de pressi\u00f3 PRV54\"},{\"@type\":\"ListItem\",\"position\":3,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\",\"name\":\"V\u00e0lvula d'exc\u00e9s de pressi\u00f3 PRV55\"},{\"@type\":\"ListItem\",\"position\":4,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-alleujament-de-pressio\/\",\"name\":\"V\u00e0lvula d'alleujament de pressi\u00f3 S3\"},{\"@type\":\"ListItem\",\"position\":5,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio\/\",\"name\":\"V\u00e0lvula d'exc\u00e9s de pressi\u00f3 S1\"},{\"@type\":\"ListItem\",\"position\":6,\"url\":\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-reductora-de-pressio-s2\/\",\"name\":\"V\u00e0lvula d'exc\u00e9s de pressi\u00f3 S2\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Quina difer\u00e8ncia hi ha entre una v\u00e0lvula d'alleujament i una v\u00e0lvula de seguretat?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"La d'alleujament s'obre en proporci\u00f3 a l'augment de pressi\u00f3 i modula per mantenir la pressi\u00f3 al valor de tarat: \u00e9s un accessori de pressi\u00f3, no de seguretat. La de seguretat protegeix dip\u00f2sits, calderes o canonades contra les sobrepressions. Si necessita protecci\u00f3, munti a m\u00e9s una de les nostres v\u00e0lvules de seguretat.\"}},{\"@type\":\"Question\",\"name\":\"V\u00e0lvula d'alleujament i v\u00e0lvula d'exc\u00e9s de pressi\u00f3 s\u00f3n el mateix?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S\u00ed, compleixen la mateixa funci\u00f3. El cat\u00e0leg de Valfonta les agrupa com a v\u00e0lvules d'exc\u00e9s de pressi\u00f3; a la nostra gamma, la S3 \u00e9s la que s'anomena v\u00e0lvula d'alleujament.\"}},{\"@type\":\"Question\",\"name\":\"Quina v\u00e0lvula d'alleujament necessito per a vapor?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"La S3 i la S1 treballen fins a 220 \u00b0C, la PRV54 fins a 210 \u00b0C i la PRV55 fins a 150 \u00b0C; la S2 admet vapor a baixa temperatura amb presa externa i tanc de condensaci\u00f3. La PRV53 no \u00e9s indicada per a vapor.\"}},{\"@type\":\"Question\",\"name\":\"Quina pressi\u00f3 de tarat es pot ajustar?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Des de 0,01 barg (10 mbar) amb la PRV55 i 0,02 barg amb la S2, fins a 20 barg amb la S3. La S1, la S2 i la S3 es lliuren preajustades al valor demanat.\"}},{\"@type\":\"Question\",\"name\":\"On s'instal\u00b7la una v\u00e0lvula d'alleujament?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Normalment en una derivaci\u00f3 de la l\u00ednia principal, per exemple al bypass d'una bomba, amb retorn a l'aspiraci\u00f3 o al dip\u00f2sit, amb un filtre al davant i un man\u00f2metre aig\u00fces amunt per comprovar el tarat.\"}}]}]}]","footnotes":"","_vg_translation_of":"43","_vg_lang":"ca","_vg_wpml_state":"{\"lang\":\"ca\",\"trid\":\"43\",\"src\":\"es\"}"},"class_list":["post-769","page","type-page","status-publish"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/pages\/769","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/comments?post=769"}],"version-history":[{"count":4,"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/pages\/769\/revisions"}],"predecessor-version":[{"id":10322,"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/pages\/769\/revisions\/10322"}],"wp:attachment":[{"href":"https:\/\/www.valfonta.com\/ca\/wp-json\/wp\/v2\/media?parent=769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}