{"id":785,"date":"2026-10-02T13:17:39","date_gmt":"2026-10-02T11:17:39","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/valvula-alleujament-de-pressio\/"},"modified":"2026-10-22T09:24:25","modified_gmt":"2026-10-22T07:24:25","slug":"valvula-alleujament-de-pressio","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/ca\/producte\/valvula-alleujament-de-pressio\/","title":{"rendered":"V\u00e0lvula d'alleujament de pressi\u00f3 S3"},"content":{"rendered":"<div class=\"wp-block-group vf-raiz vf-pl-ficha-producto 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\" aria-hidden=\"true\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/\">V\u00e0lvules d'alleujament de pressi\u00f3<\/a><span class=\"vf-sep\" aria-hidden=\"true\">\u203a<\/span><span aria-current=\"page\">V\u00e0lvula d'alleujament de pressi\u00f3 S3<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--S3 is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-hero is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-title is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-pdp-eyebrow wp-block-paragraph\">V\u00e0lvula d'alleujament de pressi\u00f3 \u00b7 C\u00e0rrega per molla<\/p><h1 class=\"wp-block-heading\">V\u00e0lvula d'alleujament de pressi\u00f3 S3<\/h1><\/div><div class=\"wp-block-group vf-pdp-media vf-photo is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-pdp-badge\">Fins a 220 \u00b0C<\/span><\/p><figure class=\"wp-block-image vf-img-suelta\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva.webp\" alt=\"V\u00e0lvula d&#x27;alleujament de pressi\u00f3 S3 de Valfonta amb c\u00e0rrega per molla i connexi\u00f3 per brides, vista en perspectiva\" class=\"wp-image-10229\" width=\"900\" height=\"900\" fetchpriority=\"high\"><\/figure><div class=\"wp-block-group vf-pdp-thumbs is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><button type=\"button\" aria-pressed=\"true\" aria-label=\"Veure la vista en perspectiva\" data-vf-thumb=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva.webp\" data-alt=\"V\u00e0lvula d&#x27;alleujament de pressi\u00f3 S3 de Valfonta amb c\u00e0rrega per molla i connexi\u00f3 per brides, vista en perspectiva\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva-400.webp\" alt=\"\" class=\"wp-image-10230\" width=\"58\" height=\"58\" loading=\"lazy\"><\/button><button type=\"button\" aria-pressed=\"false\" aria-label=\"Veure la vista frontal\" data-vf-thumb=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-frontal.webp\" data-alt=\"V\u00e0lvula d&#x27;alleujament de pressi\u00f3 S3 de Valfonta amb c\u00e0rrega per molla i connexi\u00f3 per brides, vista frontal\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-frontal-400.webp\" alt=\"\" class=\"wp-image-10231\" width=\"58\" height=\"58\" loading=\"lazy\"><\/button><\/p><\/div><\/div><div class=\"wp-block-group vf-pdp-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-lead wp-block-paragraph\">La S3 \u00e9s una v\u00e0lvula d'alleujament de pressi\u00f3 d'acci\u00f3 directa, amb c\u00e0rrega per molla i obturador guiat. Mant\u00e9 la pressi\u00f3 aig\u00fces amunt en el valor de tarat, de 0,5 a 20 barg, en vapor, gasos dels grups 1 i 2 i l\u00edquids, fins a 220 \u00b0C.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Di\u00e0metres<\/span><b>DN15 a DN150 <small>DN125 i DN150, consultar<\/small><\/b><\/li><li><span>Pressi\u00f3 nominal<\/span><b>PN25 \u2013 PN40 <small>Classe 150 \u2013 300<\/small><\/b><\/li><li><span>Pressi\u00f3 de tarat<\/span><b>0,5 a 20 barg<\/b><\/li><li><span>Temperatura<\/span><b>fins a 220 \u00b0C <small>250 \u00b0C amb juntes especials<\/small><\/b><\/li><li><span>Kv<\/span><b>3,5 a 130 m\u00b3\/h<\/b><\/li><li><span>Classe de tancament<\/span><b>IV (metall-metall) o VI (PTFE+GR)<\/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=\"\/wp-content\/uploads\/2026\/10\/S3-17A-ESP.pdf\" target=\"_blank\" rel=\"noopener\">Descarregar la fitxa t\u00e8cnica <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">T\u00e9 dubtes sobre el tarat o el dimensionament? 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><ul class=\"vf-pdp-trust wp-block-list\"><li>Disseny i fabricaci\u00f3 pr\u00f2pies a Badalona<\/li><li>Sistema de qualitat ISO 9001<\/li><li>Obturador guiat per a m\u00e9s estabilitat<\/li><li>Recanvis recomanats identificats a l'especejament<\/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=\"#aplicaciones\">Aplicacions<\/a><\/li><li><a href=\"#especificaciones\">Especificacions<\/a><\/li><li><a href=\"#funcionamiento\">Funcionament<\/a><\/li><li><a href=\"#instalacion\">Instal\u00b7laci\u00f3<\/a><\/li><li><a href=\"#documentacion\">Documentaci\u00f3<\/a><\/li><li><a href=\"#comparar\">Comparar<\/a><\/li><li><a href=\"#preguntas\">Preguntes<\/a><\/li><li><a href=\"#solicitar\">Sol\u00b7licitar oferta<\/a><\/li><\/ul><\/nav><section id=\"aplicaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-two 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\">Per a qu\u00e8 s'utilitza la v\u00e0lvula d'alleujament S3<\/h2><p class=\"wp-block-paragraph\">La <strong>S3<\/strong> \u00e9s una <a href=\"https:\/\/www.valfonta.com\/ca\/valvules-alleujament-de-pressio\/\">v\u00e0lvula d'alleujament de pressi\u00f3<\/a> que mant\u00e9 la pressi\u00f3 aig\u00fces amunt en el valor de tarat: quan la pressi\u00f3 d'entrada el supera, s'obre de manera gradual, en proporci\u00f3 a l'augment de pressi\u00f3, i torna a tancar-se quan la pressi\u00f3 es normalitza. \u00c9s d'acci\u00f3 directa: sense energia auxiliar, membrana ni canonada de comandament.<\/p><p class=\"wp-block-paragraph\">El tarat el fixa una molla i l'<strong>obturador guiat<\/strong> aporta estabilitat. Porta interiors d'acer inoxidable AISI 316L i admet tancament de classe VI amb seient de PTFE + grafit. Si treballa amb aigua, llegeixi el nostre article sobre la v\u00e0lvula d'alleujament de pressi\u00f3 per a aigua.<\/p><ul class=\"vf-pdp-apps wp-block-list\"><li><b>Bypass de bombes<\/b><span>Retorna el cabal sobrant a l'aspiraci\u00f3 o al dip\u00f2sit.<\/span><\/li><li><b>Protecci\u00f3 de l\u00ednies i equips<\/b><span>Limita la pressi\u00f3 aig\u00fces amunt al valor ajustat.<\/span><\/li><li><b>Vapor<\/b><span>Fins a 220 \u00b0C amb obturador i juntes de PTFE + grafit.<\/span><\/li><li><b>Gasos dels grups 1 i 2<\/b><span>Alleujament proporcional de l'exc\u00e9s de pressi\u00f3.<\/span><\/li><li><b>Aigua, oli i altres l\u00edquids<\/b><span>Amb obturador de PTFE + grafit, inox, EPDM, NBR, FKM o PEEK.<\/span><\/li><\/ul><\/div><aside class=\"wp-block-group vf-pdp-fit is-layout-flow wp-block-group-is-layout-flow\"><h3 class=\"wp-block-heading\">Tri\u00ef la S3 si\u2026<\/h3><ul class=\"vf-si wp-block-list\"><li>Busca una v\u00e0lvula d'acci\u00f3 directa, sense membrana ni canonada de comandament.<\/li><li>La seva pressi\u00f3 de tarat \u00e9s entre 0,5 i 20 barg.<\/li><li>Treballa amb vapor, gasos o l\u00edquids fins a 220 \u00b0C.<\/li><li>Necessita tancament de classe VI o una construcci\u00f3 especial, com ara superd\u00faplex.<\/li><\/ul><h3 class=\"wp-block-heading\">Millor un altre model si\u2026<\/h3><ul class=\"vf-no wp-block-list\"><li>Necessita tarar per sota de 0,5 barg: la <a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a> ajusta des de 0,02 barg i la <a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a> des de 0,01 barg.<\/li><li>La normativa li exigeix una v\u00e0lvula de seguretat certificada: la S3 no la substitueix; vegi les nostres <a href=\"https:\/\/www.valfonta.com\/ca\/valvules-de-seguretat\/\">v\u00e0lvules de seguretat<\/a>.<\/li><li>Vol l'eix segellat per manxa d'acer inoxidable: vegi la <a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio\/\">S1<\/a>.<\/li><li>Li n'hi ha prou amb DN15 a DN25 en inox: vegi la <a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a> o la <a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a> (vapor fins a 210 \u00b0C).<\/li><\/ul><\/aside><\/div><\/section><section id=\"especificaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Especificacions t\u00e8cniques de la v\u00e0lvula d'alleujament S3<\/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\"><table><tbody><tr><th scope=\"row\">Tipus<\/th><td>Acci\u00f3 directa, amb c\u00e0rrega per molla i obturador guiat<\/td><\/tr><tr><th scope=\"row\">Di\u00e0metres<\/th><td>DN15 a DN100; DN125 i DN150, consultar<\/td><\/tr><tr><th scope=\"row\">Connexions<\/th><td>Brides EN i ANSI \u00b7 Rosca BSP o NPT de \u00bd\u2033 a 2\u2033 \u00b7 Extrems per soldar (BW, SW) sota comanda<\/td><\/tr><tr><th scope=\"row\">Pressi\u00f3 nominal<\/th><td>PN16 \u2013 PN25 \u2013 PN40 \u00b7 ANSI Classe 150 \u2013 Classe 300<\/td><\/tr><tr><th scope=\"row\">Pressi\u00f3 de tarat<\/th><td>0,5 a 20 barg, amb diferents rangs de molla<\/td><\/tr><tr><th scope=\"row\">Coeficient Kv<\/th><td>De 3,5 m\u00b3\/h (DN15) a 130 m\u00b3\/h (DN100). Pas total de s\u00e8rie; pas redu\u00eft sota comanda<\/td><\/tr><tr><th scope=\"row\">Temperatura del cos<\/th><td>Acer al carboni: \u221210 a 220 \u00b0C \u00b7 Inox CF3M: \u221230 a 220 \u00b0C \u00b7 Fins a 250 \u00b0C amb juntes especials<\/td><\/tr><tr><th scope=\"row\">Temperatura segons l'obturador<\/th><td>NBR: 80 \u00b0C \u00b7 EPDM o FPM: 150 \u00b0C \u00b7 PTFE + grafit: 220 \u00b0C \u00b7 PEEK: 250 \u00b0C<\/td><\/tr><tr><th scope=\"row\">Juntes i empaquetadura<\/th><td>PTFE verge fins a 180 \u00b0C \u00b7 PTFE + grafit fins a 220 \u00b0C<\/td><\/tr><tr><th scope=\"row\">Classe de tancament<\/th><td>Classe IV (metall-metall) \u00b7 Classe VI (seient de PTFE + grafit)<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Vapor, gasos dels grups 1 i 2, aigua, oli i altres l\u00edquids<\/td><\/tr><tr><th scope=\"row\">Material del cos<\/th><td>Acer al carboni GP240GH (1.0619) o inox A351 CF3M. Sota comanda: bronze RG10, d\u00faplex o superd\u00faplex<\/td><\/tr><tr><th scope=\"row\">Interiors<\/th><td>Acer inoxidable AISI 316L<\/td><\/tr><tr><th scope=\"row\">Opcions<\/th><td>Regulaci\u00f3 per volant \u00b7 Obturador de PEEK, NBR, EPDM o estel\u00b7litat \u00b7 Juntes especials<\/td><\/tr><tr><th scope=\"row\">Normativa<\/th><td>Sistema de qualitat ISO 9001 \u00b7 PED 2014\/68\/UE: la placa indica si requereix marcatge CE<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Dimensions i pes<\/h3><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\"><\/th><th scope=\"col\">DN15<\/th><th scope=\"col\">DN20<\/th><th scope=\"col\">DN25<\/th><th scope=\"col\">DN32<\/th><th scope=\"col\">DN40<\/th><th scope=\"col\">DN50<\/th><th scope=\"col\">DN65<\/th><th scope=\"col\">DN80<\/th><th scope=\"col\">DN100<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Kv (m\u00b3\/h)<\/th><td>3,5<\/td><td>5<\/td><td>9<\/td><td>15<\/td><td>22<\/td><td>35<\/td><td>60<\/td><td>85<\/td><td>130<\/td><\/tr><tr><th scope=\"row\">Cv (gpm)<\/th><td>4<\/td><td>5,8<\/td><td>10,4<\/td><td>17,5<\/td><td>25<\/td><td>41<\/td><td>70<\/td><td>100<\/td><td>152<\/td><\/tr><tr><th scope=\"row\">Longitud A (EN 558-1)<\/th><td>130<\/td><td>150<\/td><td>160<\/td><td>180<\/td><td>200<\/td><td>230<\/td><td>290<\/td><td>310<\/td><td>350<\/td><\/tr><tr><th scope=\"row\">Longitud A (ANSI 150)<\/th><td>Sota comanda<\/td><td>Sota comanda<\/td><td>184<\/td><td>\u2013<\/td><td>222<\/td><td>254<\/td><td>276<\/td><td>298,5<\/td><td>352,5<\/td><\/tr><tr><th scope=\"row\">Longitud A (ANSI 300)<\/th><td>Sota comanda<\/td><td>Sota comanda<\/td><td>197<\/td><td>\u2013<\/td><td>235<\/td><td>267<\/td><td>292<\/td><td>317,5<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">Pes (kg)<\/th><td>10<\/td><td>10<\/td><td>12<\/td><td>13<\/td><td>16<\/td><td>18<\/td><td>30<\/td><td>40<\/td><td>50<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Mides en mil\u00b7l\u00edmetres. Al\u00e7ades, amb volant o sense, als pl\u00e0nols del PDF.<\/p><h3 class=\"wp-block-heading\">Rangs de tarat recomanats<\/h3><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\">Rang (barg)<\/th><th scope=\"col\">DN15 i DN20<\/th><th scope=\"col\">DN25 i DN32<\/th><th scope=\"col\">DN40 i DN50<\/th><th scope=\"col\">DN65<\/th><th scope=\"col\">DN80<\/th><th scope=\"col\">DN100<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1 \u2013 4<\/th><td>\u2013<\/td><td>\u2013<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><\/tr><tr><th scope=\"row\">1 \u2013 6<\/th><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">3 \u2013 8<\/th><td>\u2013<\/td><td>\u2013<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><\/tr><tr><th scope=\"row\">4 \u2013 12<\/th><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Consultar<\/td><\/tr><tr><th scope=\"row\">8 \u2013 16<\/th><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Est\u00e0ndard<\/td><td>Consultar<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">15 \u2013 25<\/th><td>Consultar<\/td><td>Consultar<\/td><td>Consultar<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Pressi\u00f3 de treball admissible segons la temperatura (bar, EN 12516-1 i EN 1092-2)<\/h3><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\">Cos<\/th><th scope=\"col\">\u221210 \u00b0C<\/th><th scope=\"col\">50 \u00b0C<\/th><th scope=\"col\">100 \u00b0C<\/th><th scope=\"col\">150 \u00b0C<\/th><th scope=\"col\">200 \u00b0C<\/th><th scope=\"col\">250 \u00b0C<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">PN40 \u00b7 Acer al carboni GP240GH<\/th><td>40<\/td><td>40<\/td><td>36<\/td><td>35<\/td><td>34<\/td><td>33<\/td><\/tr><tr><th scope=\"row\">PN40 \u00b7 Inox CF3M<\/th><td>40<\/td><td>38<\/td><td>33<\/td><td>30<\/td><td>28<\/td><td>26<\/td><\/tr><\/tbody><\/table><\/figure><\/div><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Especejament i materials (19 peces)<\/summary><div class=\"wp-block-group 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\">N\u00fam.<\/th><th scope=\"col\">Pe\u00e7a<\/th><th scope=\"col\">Material<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1<\/th><td>Cos<\/td><td>Acer al carboni o inox A351 CF3M (316L)<\/td><\/tr><tr><th scope=\"row\">2, 3, 5, 6<\/th><td>Seient, guia, suport de l'obturador i eix<\/td><td>Inox AISI 316L<\/td><\/tr><tr><th scope=\"row\">4<\/th><td>Obturador<\/td><td>PTFE + grafit o inox 316L; sota comanda EPDM, NBR, FKM o PEEK<\/td><\/tr><tr><th scope=\"row\">7, 24<\/th><td>Cargols i volandera<\/td><td>Acer zincat 8.8 o inox A2-70<\/td><\/tr><tr><th scope=\"row\">8, 17<\/th><td>Juntes t\u00f2riques<\/td><td>FKM (o NBR, EPDM)<\/td><\/tr><tr><th scope=\"row\">9<\/th><td>Tapa de la molla<\/td><td>Inox A351 CF3M (316L)<\/td><\/tr><tr><th scope=\"row\">10<\/th><td>Molla de regulaci\u00f3<\/td><td>Acer per a molles amb pintura epoxi<\/td><\/tr><tr><th scope=\"row\">11, 20<\/th><td>Suports inferior i superior de la molla<\/td><td>Acer zincat 1.1191<\/td><\/tr><tr><th scope=\"row\">12<\/th><td>Rodaments<\/td><td>PTFE + grafit<\/td><\/tr><tr><th scope=\"row\">13<\/th><td>Eix de regulaci\u00f3 A<\/td><td>Inox AISI 316L<\/td><\/tr><tr><th scope=\"row\">14, 19, 27, 28<\/th><td>Volandera, eix de regulaci\u00f3 B, passador i femella<\/td><td>Inox A2-70<\/td><\/tr><tr><th scope=\"row\">15<\/th><td>Tap caputx\u00f3<\/td><td>Acer zincat 1.1191 o inox 316L<\/td><\/tr><tr><th scope=\"row\">16<\/th><td>Junta t\u00f2rica<\/td><td>FKM (o NBR, EPDM, PTFE)<\/td><\/tr><tr><th scope=\"row\">21<\/th><td>Junta plana<\/td><td>PTFE<\/td><\/tr><tr><th scope=\"row\">22<\/th><td>Junta plana<\/td><td>Grafit (o PTFE)<\/td><\/tr><tr><th scope=\"row\">23<\/th><td>Bonet<\/td><td>Inox AISI 316L<\/td><\/tr><tr><th scope=\"row\">25<\/th><td>Junta d'a\u00efllament<\/td><td>PTFE + grafit + inox 302<\/td><\/tr><tr><th scope=\"row\">26<\/th><td>Guia de l'eix<\/td><td>Bronze o inox 316L + Ni<\/td><\/tr><tr><th scope=\"row\">110 \u2013 116<\/th><td>Components de l'opci\u00f3 amb volant<\/td><td>Volant d'acer pintat, eix 316L, tap i juntes<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Recanvis recomanats<\/summary><div class=\"wp-block-group 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\">Refer\u00e8ncia<\/th><th scope=\"col\">Descripci\u00f3<\/th><th scope=\"col\">Peces<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">\u2014<\/th><td>Obturador<\/td><td>4<\/td><\/tr><tr><th scope=\"row\">\u2014<\/th><td>Juntes t\u00f2riques<\/td><td>8, 16 i 17<\/td><\/tr><tr><th scope=\"row\">\u2014<\/th><td>Rodaments<\/td><td>12<\/td><\/tr><tr><th scope=\"row\">\u2014<\/th><td>Juntes planes i d'a\u00efllament<\/td><td>21, 22 i 25<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/div><\/details><\/section><section id=\"funcionamiento\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Com funciona la v\u00e0lvula d'alleujament S3<\/h2><p class=\"wp-block-paragraph\">La pressi\u00f3 d'entrada i la for\u00e7a de la molla s'equilibren sobre l'obturador, sense energia auxiliar.<\/p><ol class=\"vf-steps wp-block-list\"><li><b>V\u00e0lvula tancada.<\/b> Mentre la for\u00e7a de la pressi\u00f3 d'entrada (p1) \u00e9s menor que la de la molla, l'obturador roman sobre el seient.<\/li><li><b>Obertura proporcional.<\/b> Quan la supera, la v\u00e0lvula s'obre en proporci\u00f3 a l'augment de pressi\u00f3 i alleuja l'exc\u00e9s de fluid.<\/li><li><b>Regulaci\u00f3 estable.<\/b> La v\u00e0lvula modula perqu\u00e8 la pressi\u00f3 aig\u00fces amunt no superi el tarat; l'obturador guiat li dona estabilitat.<\/li><li><b>Tancament.<\/b> Quan la pressi\u00f3 es normalitza, la molla torna a tancar la v\u00e0lvula.<\/li><li><b>Tarat.<\/b> La for\u00e7a de la molla s'ajusta amb l'eix de regulaci\u00f3 (13) o, en la versi\u00f3 amb volant, amb el volant.<\/li><\/ol><p class=\"wp-block-paragraph\">Una v\u00e0lvula d'alleujament no \u00e9s una v\u00e0lvula de seguretat; si necessita protecci\u00f3 contra sobrepressions, instal\u00b7li-les totes dues. Vegi la difer\u00e8ncia entre v\u00e0lvula de seguretat i d'alleujament.<\/p><\/section><section id=\"instalacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Instal\u00b7laci\u00f3 de la v\u00e0lvula d'alleujament S3<\/h2><p class=\"wp-block-paragraph\">La instal\u00b7laci\u00f3 t\u00edpica munta la S3 en una derivaci\u00f3 de la l\u00ednia principal, per exemple en el bypass d'una bomba, de manera que el cabal que alleuja torna a l'aspiraci\u00f3 o al dip\u00f2sit. Un man\u00f2metre aig\u00fces amunt permet comprovar la pressi\u00f3 de tarat.<\/p><div class=\"wp-block-group vf-diagram vf-s-7307c0 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 S3<\/li><li>Retorn a l'aspiraci\u00f3 o al dip\u00f2sit<\/li><li>L\u00ednia principal cap al consum<\/li><\/ol><\/div><\/div><h3 class=\"wp-block-heading\">Muntatge i posada en marxa<\/h3><ol class=\"vf-steps wp-block-list\"><li><b>Protegeixi la v\u00e0lvula<\/b> de la brut\u00edcia i dels cops. Si fa servir elevadors, fixi'ls al cos, mai al cargol de regulaci\u00f3.<\/li><li><b>Netegi la canonada i instal\u00b7li un filtre colador<\/b> davant de la v\u00e0lvula per protegir el tancament.<\/li><li><b>Respecti la fletxa del cos<\/b> i munti la v\u00e0lvula en canonada horitzontal, que \u00e9s la posici\u00f3 recomanada (amb un lleuger pendent si hi ha condensats).<\/li><li><b>Subjecti la canonada, no la v\u00e0lvula:<\/b> suports a prop de les brides.<\/li><li><b>Posi en marxa a poc a poc:<\/b> obri lentament les v\u00e0lvules d'a\u00efllament, primer la d'entrada, per evitar cops d'ariet.<\/li><li><b>Ajusti el tarat<\/b> si cal (Valfonta la lliura ajustada a la pressi\u00f3 especificada): retiri el tap (15) i la junta t\u00f2rica (16) i giri l'eix de regulaci\u00f3 (13), o giri el volant. En sentit horari es comprimeix la molla i augmenta la pressi\u00f3 de tarat. Torni a muntar la junta t\u00f2rica i el tap.<\/li><\/ol><p class=\"wp-block-paragraph\">L'ha d'instal\u00b7lar personal especialitzat, sense superar la pressi\u00f3 i la temperatura de disseny. Vegi la nostra guia de tarat de v\u00e0lvules d'alleujament.<\/p><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Documentaci\u00f3 t\u00e8cnica de la S3<\/h2><div class=\"wp-block-group vf-docs is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-doc vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><i>PDF<\/i><\/p><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>Fitxa t\u00e8cnica S3<\/b><span>PDF \u00b7 6 p\u00e0gines \u00b7 caracter\u00edstiques, especejament, dimensions i rangs de molla<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/S3-17A-ESP.pdf\" aria-label=\"PDF Fitxa t\u00e8cnica S3 PDF \u00b7 6 p\u00e0gines \u00b7 caracter\u00edstiques, especejament, dimensions i rangs de molla\" target=\"_blank\" rel=\"noopener\"><\/a><\/p><\/div><div class=\"wp-block-group vf-doc vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><i>PDF<\/i><\/p><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>Manual de funcionament i instal\u00b7laci\u00f3<\/b><span>PDF \u00b7 12 p\u00e0gines \u00b7 muntatge, regulaci\u00f3, avaries i recepci\u00f3<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/Manual-S3-17A-ESP.pdf\" aria-label=\"PDF Manual de funcionament i instal\u00b7laci\u00f3 PDF \u00b7 12 p\u00e0gines \u00b7 muntatge, regulaci\u00f3, avaries i recepci\u00f3\" target=\"_blank\" rel=\"noopener\"><\/a><\/p><\/div><\/div><p class=\"wp-block-paragraph\">Per demanar recanvis, indiqui el n\u00famero de s\u00e8rie (S\/N) de la placa. Certificats de comanda: vegi els nostres <a href=\"https:\/\/www.valfonta.com\/ca\/certificats\/\">certificats de qualitat<\/a>.<\/p><\/section><section id=\"comparar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">La S3 comparada amb altres v\u00e0lvules d'alleujament i d'exc\u00e9s de pressi\u00f3<\/h2><p class=\"wp-block-paragraph\">La gamma va de DN15 a DN150 i de 0,01 a 20 barg de tarat.<\/p><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\">Model<\/th><th scope=\"col\">DN<\/th><th scope=\"col\">PN<\/th><th scope=\"col\">Tarat (barg)<\/th><th scope=\"col\">T. m\u00e0x. (\u00b0C)<\/th><th scope=\"col\">Vapor<\/th><th scope=\"col\">Cos de s\u00e8rie<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\">PRV53<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,5 \u2013 15<\/td><td>150<\/td><td>No<\/td><td>Inox CF3M<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\">PRV54<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,5 \u2013 12<\/td><td>210<\/td><td>S\u00ed<\/td><td>Inox CF3M<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\">PRV55<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,01 \u2013 8<\/td><td>150<\/td><td>S\u00ed<\/td><td>Inox CF3M<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio\/\">S1<\/a><\/th><td>15 \u2013 150<\/td><td>40<\/td><td>0,5 \u2013 15<\/td><td>220<\/td><td>S\u00ed<\/td><td>Acer al carboni o inox CF3M<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-reductora-de-pressio-s2\/\">S2<\/a><\/th><td>15 \u2013 100<\/td><td>40<\/td><td>0,02 \u2013 10<\/td><td>180<\/td><td>S\u00ed<\/td><td>Acer al carboni o inox CF3M<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-class=\"vf-cur\"><\/span>S3<\/th><td>15 \u2013 150<\/td><td>40<\/td><td>0,5 \u2013 20<\/td><td>220<\/td><td>S\u00ed<\/td><td>Acer al carboni o inox CF3M<\/td><\/tr><tr><th scope=\"row\">S4<\/th><td>15 \u2013 100<\/td><td>40<\/td><td>0,5 \u2013 20<\/td><td>220<\/td><td>S\u00ed<\/td><td>Acer al carboni o inox CF3M<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Dades del cat\u00e0leg resum de Valfonta (2025); tarat de la S2 segons la seva fitxa t\u00e8cnica. Totes admeten aigua, oli, aire i gasos no inflamables.<\/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 la S3<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Una v\u00e0lvula d&#x27;alleujament de pressi\u00f3 substitueix 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\">No. La S3 alleuja l'exc\u00e9s de pressi\u00f3 de manera proporcional, per\u00f2 no \u00e9s una v\u00e0lvula de seguretat. Si la instal\u00b7laci\u00f3 necessita protecci\u00f3 contra sobrepressions, cal muntar-hi, a m\u00e9s, una <a href=\"https:\/\/www.valfonta.com\/ca\/valvules-de-seguretat\/\">v\u00e0lvula de seguretat<\/a>.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Quina pressi\u00f3 de tarat admet la S3?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">De 0,5 a 20 barg, amb diferents molles. Per exemple, en DN15 i DN20 els rangs est\u00e0ndard s\u00f3n d'1 a 6, de 4 a 12 i de 8 a 16 barg; el de 15 a 25 barg, sota consulta.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Com s&#x27;ajusta la pressi\u00f3 de tarat?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Retiri el tap (15) i la junta t\u00f2rica (16) i giri l'eix de regulaci\u00f3 (13): en sentit horari augmenta la pressi\u00f3 de tarat i en sentit antihorari disminueix. Amb volant, n'hi ha prou de girar-lo.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Es pot fer servir amb vapor?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">S\u00ed. Amb obturador i juntes de PTFE + grafit treballa fins a 220 \u00b0C, i fins a 250 \u00b0C amb juntes especials o amb obturador de PEEK.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Serveix per a instal\u00b7lacions contra incendis?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">S\u00ed. La S3 t\u00e9 homologaci\u00f3 espec\u00edfica per a instal\u00b7lacions de protecci\u00f3 contra incendis, on es munta en el bypass de la bomba. Demani'ns el certificat juntament amb l'oferta.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Com s&#x27;instal\u00b7la en el bypass d&#x27;una bomba?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">En una derivaci\u00f3 de la impulsi\u00f3 que torna a l'aspiraci\u00f3 o al dip\u00f2sit, amb un man\u00f2metre aig\u00fces amunt. Si la pressi\u00f3 supera el tarat, la S3 s'obre i retorna el cabal sobrant.<\/p><\/div><\/details><\/section><section id=\"relacionados\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Altres models de v\u00e0lvules d'alleujament de pressi\u00f3<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s S1\" class=\"wp-image-205\" width=\"300\" height=\"300\" loading=\"lazy\"><b>V\u00e0lvula d'exc\u00e9s S1<\/b><span>Membrana i manxa, fins a DN150 i 220 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-reductora-de-pressio-s2\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2-PROVISIONAL.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s S2\" class=\"wp-image-206\" width=\"300\" height=\"300\" loading=\"lazy\"><b>V\u00e0lvula d'exc\u00e9s S2<\/b><span>Membrana amb presa interna, tarat des de 0,02 barg.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv53\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s PRV53\" class=\"wp-image-207\" width=\"300\" height=\"300\" loading=\"lazy\"><b>V\u00e0lvula d'exc\u00e9s PRV53<\/b><span>Inox CF3M, DN15 a DN25, tarat de 0,5 a 15 barg.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv54\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s PRV54\" class=\"wp-image-207\" width=\"300\" height=\"300\" loading=\"lazy\"><b>V\u00e0lvula d'exc\u00e9s PRV54<\/b><span>Inox CF3M, DN15 a DN25, vapor fins a 210 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-exces-de-pressio-model-prv55\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV45-55.jpg\" alt=\"V\u00e0lvula d&#x27;exc\u00e9s PRV55\" class=\"wp-image-208\" width=\"300\" height=\"300\" loading=\"lazy\"><b>V\u00e0lvula d'exc\u00e9s PRV55<\/b><span>Tarats des de 0,01 barg, DN15 a DN25.<\/span><\/a><\/li><\/ul><\/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 de la S3<\/h2><p class=\"wp-block-paragraph\">Indiqui'ns les dades de la seva instal\u00b7laci\u00f3 i li recomanarem el di\u00e0metre, el rang de molla i el material de l'obturador adequats 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 d'alleujar la v\u00e0lvula<\/li><li>Di\u00e0metre, material del cos i tipus de connexi\u00f3<\/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-f586-o1\" lang=\"ca\" dir=\"ltr\" data-wpcf7-id=\"586\">\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\/product\/785#wpcf7-f586-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=\"586\" \/><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-f586-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=\"1792703047.fd65451f3a5a56ff\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"S3\" type=\"hidden\" name=\"modelo\" \/><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><fieldset><legend>Dades de l'aplicaci\u00f3 (opcional)<\/legend><label>Di\u00e0metre<span class=\"wpcf7-form-control-wrap\" data-name=\"dn\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"dn\"><option value=\"\">Seleccioni<\/option><option value=\"DN15 (\u00bd\u2033)\">DN15 (\u00bd\u2033)<\/option><option value=\"DN20 (\u00be\u2033)\">DN20 (\u00be\u2033)<\/option><option value=\"DN25 (1\u2033)\">DN25 (1\u2033)<\/option><option value=\"DN32 (1\u00bc\u2033)\">DN32 (1\u00bc\u2033)<\/option><option value=\"DN40 (1\u00bd\u2033)\">DN40 (1\u00bd\u2033)<\/option><option value=\"DN50 (2\u2033)\">DN50 (2\u2033)<\/option><option value=\"DN65\">DN65<\/option><option value=\"DN80\">DN80<\/option><option value=\"DN100\">DN100<\/option><option value=\"DN125\">DN125<\/option><option value=\"DN150\">DN150<\/option><option value=\"No ho s\u00e9\">No ho s\u00e9<\/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=\"aigua, vapor, oli\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>Pressi\u00f3 de servei (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"p_servicio\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"p_servicio\" \/><\/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. 15 m\u00b3\/h\" 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><\/fieldset><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>","protected":false},"excerpt":{"rendered":"<p>Inici\u203aV\u00e0lvules d'alleujament de pressi\u00f3\u203aV\u00e0lvula d'alleujament de pressi\u00f3 S3 V\u00e0lvula d'alleujament de pressi\u00f3 \u00b7 C\u00e0rrega per molla V\u00e0lvula d'alleujament de pressi\u00f3 S3 Fins a 220 \u00b0C La S3 \u00e9s una v\u00e0lvula d'alleujament de pressi\u00f3 d'acci\u00f3 directa, amb c\u00e0rrega per molla i obturador guiat. Mant\u00e9 la pressi\u00f3 aig\u00fces amunt en el valor de tarat, de 0,5 a ... <a title=\"V\u00e0lvula d&#039;alleujament de pressi\u00f3 S3\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/ca\/producte\/valvula-alleujament-de-pressio\/\" aria-label=\"M\u00e9s informaci\u00f3 sobre V\u00e0lvula d&#039;alleujament de pressi\u00f3 S3\">Llegiu m\u00e9s<\/a><\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"V\u00e0lvula d'alleujament de pressi\u00f3 S3 de molla | Valfonta","rank_math_description":"V\u00e0lvula d'alleujament de pressi\u00f3 S3 d'acci\u00f3 directa i c\u00e0rrega per molla. DN15 a DN150, PN40, tarat de 0,5 a 20 barg, vapor, gasos i l\u00edquids fins a 220 \u00b0C.","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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