{"id":655,"date":"2026-10-02T13:17:43","date_gmt":"2026-10-02T11:17:43","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/pressure-excess-valve-prv53\/"},"modified":"2026-10-22T09:22:43","modified_gmt":"2026-10-22T07:22:43","slug":"pressure-excess-valve-prv53","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/","title":{"rendered":"PRV53 excess pressure valve"},"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--Breadcrumbs is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"\/en\/\">Home<\/a><span class=\"vf-sep\" aria-hidden=\"true\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\">Pressure relief valves<\/a><span class=\"vf-sep\" aria-hidden=\"true\">\u203a<\/span><span aria-current=\"page\">PRV53 excess pressure valve<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--PRV53 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\">Excess pressure valve \u00b7 Direct-acting<\/p><h1 class=\"wp-block-heading\">PRV53 excess pressure valve<\/h1><\/div><div class=\"wp-block-group vf-pdp-media is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-pdp-badge\">316L stainless<\/span><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\" alt=\"PRV53 excess pressure valve in 316L stainless steel with threaded connection\" class=\"wp-image-181\" width=\"700\" height=\"700\" fetchpriority=\"high\"><\/p><\/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\">Self-regulating, direct-acting, piston-balanced excess pressure valve with body, cap, and internals in 316L stainless steel. It keeps the line pressure stable and discharges the excess when the set pressure is exceeded, on liquids, compressed air, and inert gases up to 150 \u00b0C.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Sizes<\/span><b>DN15 to DN25<\/b><\/li><li><span>Pressure rating<\/span><b>PN25<\/b><\/li><li><span>Set pressure range<\/span><b>0.5 to 10 barg <small>15 on request<\/small><\/b><\/li><li><span>Inlet pressure<\/span><b>up to 10 barg <small>standard<\/small><\/b><\/li><li><span>Temperature<\/span><b>\u221230 to 150 \u00b0C <small>depending on gaskets<\/small><\/b><\/li><li><span>Kv<\/span><b>2 to 3.5 m\u00b3\/h<\/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\">Request a quote<\/a><a class=\"vf-btn vf-btn--sec\" href=\"\/wp-content\/uploads\/2026\/10\/PRV53-17-ESP.pdf\" target=\"_blank\" rel=\"noopener\">Download datasheet <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">Questions about set pressure or sizing? Call <a href=\"tel:+34933720888\">933 720 888<\/a> or email <a href=\"mailto:valfonta@valfonta.com\">valfonta@valfonta.com<\/a>.<\/p><\/div><\/div><ul class=\"vf-pdp-trust wp-block-list\"><li>In-house design and manufacturing in Badalona<\/li><li>ATEX II 2 GD marking for zones 1 and 21<\/li><li>Installation in any position<\/li><li>Spare gasket kits and spring<\/li><\/ul><nav class=\"wp-block-group vf-pdp-nav vfa-aria-label--Datasheet%20contents is-layout-flow wp-block-group-is-layout-flow\"><ul class=\"wp-block-list\"><li><a href=\"#aplicaciones\">Applications<\/a><\/li><li><a href=\"#especificaciones\">Specifications<\/a><\/li><li><a href=\"#funcionamiento\">Operation<\/a><\/li><li><a href=\"#instalacion\">Installation<\/a><\/li><li><a href=\"#documentacion\">Documentation<\/a><\/li><li><a href=\"#comparar\">Compare<\/a><\/li><li><a href=\"#preguntas\">FAQ<\/a><\/li><li><a href=\"#solicitar\">Request a quote<\/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\">What the PRV53 is used for<\/h2><p class=\"wp-block-paragraph\">The <strong>PRV53<\/strong> is a self-regulating <a href=\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\">excess pressure valve<\/a>: it needs no auxiliary power or pilot line. When the upstream pressure exceeds the set value, it opens proportionally and relieves the excess, so the main line pressure is held at the set value.<\/p><p class=\"wp-block-paragraph\">The typical installation is in a <strong>bypass downstream of a pump<\/strong>, with the excess flow returned to the tank. Body, cap, and internals are made of <strong>AISI 316L stainless steel<\/strong>. More detail in our article on <a href=\"https:\/\/www.valfonta.com\/en\/blog\/self-regulating-excess-pressure-valves\/\">self-regulating excess pressure valves<\/a>.<\/p><ul class=\"vf-pdp-apps wp-block-list\"><li><b>Pump bypass<\/b><span>Relief of the pump discharge, with the excess flow returned to the tank.<\/span><\/li><li><b>Chemical laboratories<\/b><span>Stable pressure in liquid and gas circuits.<\/span><\/li><li><b>Sanitary plants<\/b><span>Circuits that require stainless steel.<\/span><\/li><li><b>Compressed air<\/b><span>Limits network pressure to the set value.<\/span><\/li><li><b>Fuel oil and nitrogen<\/b><span>Group 1 and 2 fluids, including inert gases.<\/span><\/li><li><b>Oxygen service<\/b><span>On request, the valve is supplied fully degreased.<\/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\">Choose the PRV53 if\u2026<\/h3><ul class=\"vf-si wp-block-list\"><li>You work with water, fuel oil, compressed air, nitrogen, or other inert gases.<\/li><li>You need small sizes, from DN15 to DN25, and a set pressure from 0.5 to 10 barg.<\/li><li>The body and internals must be 316L stainless steel.<\/li><li>You are looking for a simple valve, with no pilot, that can be installed in any position.<\/li><\/ul><h3 class=\"wp-block-heading\">Choose another model if\u2026<\/h3><ul class=\"vf-no wp-block-list\"><li>The fluid is steam: see the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv54\/\">PRV54<\/a> (up to 210 \u00b0C), or the <a href=\"https:\/\/www.valfonta.com\/en\/product\/excess-pressure-valve-model-prv55\/\">PRV55<\/a> (up to 150 \u00b0C).<\/li><li>You need a set pressure below 0.5 barg: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/excess-pressure-valve-model-prv55\/\">PRV55<\/a> works from 0.01 barg.<\/li><li>You need more than DN25: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s1\/\">S1<\/a> and the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-relief-valve-s3\/\">S3<\/a> go up to DN150, and the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s2\/\">S2<\/a> up to DN100.<\/li><li>You need set pressures up to 20 barg or PN40: see the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-relief-valve-s3\/\">S3<\/a>.<\/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\">PRV53 technical specifications<\/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\">Type<\/th><td>Self-regulating, direct-acting, piston-balanced excess pressure valve<\/td><\/tr><tr><th scope=\"row\">Sizes<\/th><td>DN15 (\u00bd\u2033), DN20 (\u00be\u2033), and DN25 (1\u2033)<\/td><\/tr><tr><th scope=\"row\">Connections<\/th><td>BSP or NPT thread \u00b7 EN PN16\/25 flanges \u00b7 ANSI CL150 flanges<\/td><\/tr><tr><th scope=\"row\">Pressure rating<\/th><td>PN25<\/td><\/tr><tr><th scope=\"row\">Maximum inlet pressure<\/th><td>10 barg in standard version (contact us for other ranges)<\/td><\/tr><tr><th scope=\"row\">Set pressure ranges<\/th><td>0.5 \u2013 3 barg \u00b7 1 \u2013 6 barg \u00b7 3 \u2013 10 barg (depending on spring). 5 \u2013 15 barg on request<\/td><\/tr><tr><th scope=\"row\">Kv coefficient<\/th><td>2 m\u00b3\/h (DN15) \u00b7 2.5 m\u00b3\/h (DN20) \u00b7 3.5 m\u00b3\/h (DN25). Reduced Kv on request<\/td><\/tr><tr><th scope=\"row\">Temperature depending on gaskets<\/th><td>NBR: \u221220 to +80 \u00b0C \u00b7 EPDM: \u221230 to +125 \u00b0C \u00b7 Viton: \u221210 to +150 \u00b0C<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Group 1 and 2 liquids and gases: water, fuel oil, compressed air, nitrogen, inert gases<\/td><\/tr><tr><th scope=\"row\">Materials<\/th><td>Body and cap in A351 CF3M (AISI 316L) stainless steel. Internals in AISI 316L. NBR plug as standard (EPDM, PTFE+GR, or FKM)<\/td><\/tr><tr><th scope=\"row\">Mounting position<\/th><td>Any position, following the flow direction arrow on the body<\/td><\/tr><tr><th scope=\"row\">Pressure Equipment Directive<\/th><td>PED 2014\/68\/EU, Article 4.3: CE marking not required (Group 1 and 2 fluids)<\/td><\/tr><tr><th scope=\"row\">ATEX<\/th><td>II 2 GD c IIC Tx \/ c IIIC Tx\u00baC \u00b7 certificate LOM 14.034 U<\/td><\/tr><tr><th scope=\"row\">On request<\/th><td>Body and cap in bronze or super duplex \u00b7 weld ends (socket weld or butt weld) \u00b7 clamp connection \u00b7 degreased for oxygen service \u00b7 special gaskets<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Dimensions and weight<\/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\">\u00bd\u2033 threaded<\/th><th scope=\"col\">\u00be\u2033 threaded<\/th><th scope=\"col\">1\u2033 threaded<\/th><th scope=\"col\">DN15 EN<\/th><th scope=\"col\">DN20 EN<\/th><th scope=\"col\">DN25 EN<\/th><th scope=\"col\">DN15 ANSI<\/th><th scope=\"col\">DN20 ANSI<\/th><th scope=\"col\">DN25 ANSI<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Kv (m\u00b3\/h)<\/th><td>2<\/td><td>2,5<\/td><td>3,5<\/td><td>2<\/td><td>2,5<\/td><td>3,5<\/td><td>2<\/td><td>2,5<\/td><td>3,5<\/td><\/tr><tr><th scope=\"row\">Length A \/ AA<\/th><td>108<\/td><td>108<\/td><td>108<\/td><td>130<\/td><td>150<\/td><td>160<\/td><td>184<\/td><td>184<\/td><td>184<\/td><\/tr><tr><th scope=\"row\">Height H1<\/th><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><td>135<\/td><\/tr><tr><th scope=\"row\">Height H2<\/th><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><td>185<\/td><\/tr><tr><th scope=\"row\">Flange \u00d8 D1<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>95<\/td><td>105<\/td><td>115<\/td><td>89<\/td><td>98<\/td><td>108<\/td><\/tr><tr><th scope=\"row\">Weight (kg)<\/th><td>2,5<\/td><td>2,5<\/td><td>2,5<\/td><td>5<\/td><td>5<\/td><td>5<\/td><td>5<\/td><td>5<\/td><td>5<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Dimensions in millimeters. The dimensioned drawings and the remaining flange dimensions are in the PDF datasheet.<\/p><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Exploded view and materials (20 parts)<\/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\">No.<\/th><th scope=\"col\">Part<\/th><th scope=\"col\">Material<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1<\/th><td>Body<\/td><td>Stainless steel A351 CF3M<\/td><\/tr><tr><th scope=\"row\">2<\/th><td>Sealing screw<\/td><td>Stainless steel A2-70<\/td><\/tr><tr><th scope=\"row\">3<\/th><td>Plug<\/td><td>NBR (EPDM, PTFE+GR, FKM)<\/td><\/tr><tr><th scope=\"row\">5<\/th><td>Seat<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">6<\/th><td>Body gasket<\/td><td>PTFE<\/td><\/tr><tr><th scope=\"row\">7<\/th><td>Cap<\/td><td>Stainless steel A351 CF3M<\/td><\/tr><tr><th scope=\"row\">8<\/th><td>Spring washer<\/td><td>Galvanized steel ST-52<\/td><\/tr><tr><th scope=\"row\">9<\/th><td>Adjusting screw<\/td><td>Stainless steel<\/td><\/tr><tr><th scope=\"row\">10<\/th><td>Adjusting spring<\/td><td>Steel 52SiCrNi5 with epoxy paint (60\u2013100 microns)<\/td><\/tr><tr><th scope=\"row\">11<\/th><td>Piston<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">12<\/th><td>O-ring<\/td><td>NBR (EPDM, FKM)<\/td><\/tr><tr><th scope=\"row\">13<\/th><td>Plunger gasket<\/td><td>NBR (EPDM, FKM)<\/td><\/tr><tr><th scope=\"row\">14<\/th><td>Screws (x4)<\/td><td>Stainless steel A2-70<\/td><\/tr><tr><th scope=\"row\">15<\/th><td>O-ring<\/td><td>Same as no. 12<\/td><\/tr><tr><th scope=\"row\">16<\/th><td>O-ring<\/td><td>NBR (EPDM, FKM)<\/td><\/tr><tr><th scope=\"row\">17<\/th><td>Stem<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">18<\/th><td>Seat guide<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">20<\/th><td>Bushing guide<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">21<\/th><td>Bottom cover<\/td><td>Stainless steel AISI 316L<\/td><\/tr><tr><th scope=\"row\">22<\/th><td>O-ring<\/td><td>NBR (EPDM, FKM)<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Recommended spare parts<\/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\">Reference<\/th><th scope=\"col\">Description<\/th><th scope=\"col\">Parts<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">PRV53.SP1<\/th><td>NBR gasket kit (80 \u00b0C)<\/td><td>3, 6, 12, 13, 15, 16 and 22<\/td><\/tr><tr><th scope=\"row\">PRV53.SP2<\/th><td>EPDM gasket kit (125 \u00b0C)<\/td><td>3, 6, 12, 13, 15, 16 and 22<\/td><\/tr><tr><th scope=\"row\">PRV53.SP3<\/th><td>FKM gasket kit (150 \u00b0C)<\/td><td>3, 6, 12, 13, 15, 16 and 22<\/td><\/tr><tr><th scope=\"row\">PRV53.SP5<\/th><td>Adjusting spring<\/td><td>10<\/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\">How the PRV53 works<\/h2><p class=\"wp-block-paragraph\">The PRV53 works on a balance between the adjusting spring and the inlet pressure acting on the piston. It needs no air or electricity.<\/p><ol class=\"vf-steps wp-block-list\"><li><b>Closed without pressure.<\/b> As long as the inlet pressure has not reached the set pressure, the adjusting spring keeps the valve closed.<\/li><li><b>Internal sensing.<\/b> The upstream pressure reaches the piston through the stem, with no external control line.<\/li><li><b>Proportional opening.<\/b> When the inlet pressure exceeds the set point, the plug moves and the valve opens in proportion to the excess pressure.<\/li><li><b>Relief.<\/b> As the excess flow is discharged, the line pressure is held at the set value. If it drops, the spring closes the valve again.<\/li><\/ol><\/section><section id=\"instalacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">PRV53 installation<\/h2><p class=\"wp-block-paragraph\">The typical installation of the PRV53 is on a branch line downstream of the pump, discharging the excess flow to the tank.<\/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=\"Installation diagram of a pressure relief or excess pressure valve on a branch line\"><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>Pump or equipment that generates the pressure<\/li><li>Inlet pressure gauge<\/li><li>PRV53 excess pressure valve, on a branch line<\/li><li>Excess flow discharged to the tank<\/li><li>Point of use or protected equipment<\/li><\/ol><\/div><\/div><h3 class=\"wp-block-heading\">Installation and start-up<\/h3><ol class=\"vf-steps wp-block-list\"><li><b>Clean the pipe<\/b> before installing the valve: any particle can damage the seat.<\/li><li><b>Install a strainer<\/b> upstream of the valve to protect the seat.<\/li><li><b>Follow the arrow on the body.<\/b> The valve can be installed in any position.<\/li><li><b>Install the branch line with its isolation valves<\/b>, connected to the main pipe downstream of the pump.<\/li><li><b>Leave a minimum of 0.5 to 1 m<\/b> between the PRV53 and the isolation valve for better regulation.<\/li><li><b>Start up slowly:<\/b> open the isolation valves gradually to avoid water hammer.<\/li><li><b>Adjust the set pressure<\/b> with an 8 mm Allen key on the adjusting screw. Compressing the spring raises the set pressure; releasing it lowers it. Check the value on the inlet pressure gauge.<\/li><\/ol><p class=\"wp-block-paragraph\">The valve must be installed by qualified personnel and must never exceed the operating pressure and temperature for which it was sized. In ATEX zones, the valve must be equipotentially bonded to the installation. See also how to prevent water hammer in pipes.<\/p><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">PRV53 technical documentation<\/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>PRV53 datasheet<\/b><span>PDF \u00b7 3 pages \u00b7 features, exploded view, spare parts, and dimensions<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/PRV53-17-ESP.pdf\" aria-label=\"PDF PRV53 datasheet PDF \u00b7 3 pages \u00b7 features, exploded view, spare parts, and dimensions\" 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>Operation and installation manual<\/b><span>PDF \u00b7 11 pages \u00b7 installation, ATEX, maintenance, and receiving<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/Manual-PRV53-17-ESP.pdf\" aria-label=\"PDF Operation and installation manual PDF \u00b7 11 pages \u00b7 installation, ATEX, maintenance, and receiving\" target=\"_blank\" rel=\"noopener\"><\/a><\/p><\/div><\/div><p class=\"wp-block-paragraph\">Do you need an order certificate or the ATEX documentation? See our <a href=\"https:\/\/www.valfonta.com\/en\/certificates\/\">quality certificates<\/a> or request it from our technical team.<\/p><\/section><section id=\"comparar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">PRV53 vs. other excess pressure valves<\/h2><p class=\"wp-block-paragraph\">The range covers DN15 to DN150 and set pressures from 0.01 to 20 barg. Check whether the PRV53 is the right model or whether another one suits you better.<\/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\">Set pressure (barg)<\/th><th scope=\"col\">Max. T (\u00b0C)<\/th><th scope=\"col\">Steam<\/th><th scope=\"col\">Body<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-class=\"vf-cur\"><\/span>PRV53<\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,5 \u2013 15<\/td><td>150<\/td><td>No<\/td><td>CF3M stainless<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv54\/\">PRV54<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,5 \u2013 12<\/td><td>210<\/td><td>Yes<\/td><td>CF3M stainless<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/excess-pressure-valve-model-prv55\/\">PRV55<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>0,01 \u2013 8<\/td><td>150<\/td><td>Yes<\/td><td>CF3M stainless<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s1\/\">S1<\/a><\/th><td>15 \u2013 150<\/td><td>40<\/td><td>0,5 \u2013 15<\/td><td>220<\/td><td>Yes<\/td><td>WCB steel or CF3M stainless<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s2\/\">S2<\/a><\/th><td>15 \u2013 100<\/td><td>40<\/td><td>0,02 \u2013 10<\/td><td>180<\/td><td>Yes<\/td><td>WCB steel or CF3M stainless<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-relief-valve-s3\/\">S3<\/a><\/th><td>15 \u2013 150<\/td><td>40<\/td><td>0,5 \u2013 20<\/td><td>220<\/td><td>Yes<\/td><td>WCB steel or CF3M stainless<\/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>Yes<\/td><td>WCB steel or CF3M stainless<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Data from the Valfonta excess pressure valve summary catalog (2025), except the S2 set pressure, which comes from its datasheet. All models accept liquids, oil, air, and non-flammable gases. If you are unsure whether you need an excess pressure valve or a safety valve, read <a href=\"https:\/\/www.valfonta.com\/en\/blog\/what-difference-between-safety-valve-and-relief-valve\/\">the difference between a safety valve and a relief valve<\/a>.<\/p><\/section><section id=\"preguntas\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Frequently asked questions about the PRV53<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can the PRV53 be used with steam?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">No. The PRV53 is designed for liquids and inert gases, up to 150 \u00b0C with Viton gaskets. For steam, see the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv54\/\">PRV54<\/a> (up to 210 \u00b0C), or the <a href=\"https:\/\/www.valfonta.com\/en\/product\/excess-pressure-valve-model-prv55\/\">PRV55<\/a> (up to 150 \u00b0C).<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What set pressure can be adjusted?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">It depends on the spring: there are three standard ranges, 0.5 to 3, 1 to 6, and 3 to 10 barg, plus a 5 to 15 barg range on request. The standard maximum inlet pressure is 10 barg.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How do you adjust the set pressure of the PRV53?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">With an 8 mm Allen key on the adjusting screw. Compressing the spring raises the pressure at which the valve opens; releasing it lowers it. Check the value on the inlet pressure gauge and see our guide on relief valve set pressure.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What maintenance does it need?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">It requires no periodic maintenance, but the gaskets and wear parts should be checked according to the service conditions. This can be done with the valve installed, depressurized, and isolated. Gasket kits are available in NBR, EPDM, and FKM (PRV53.SP1 to SP3), as well as the adjusting spring (PRV53.SP5).<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Does the PRV53 carry CE marking?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">No. Given its size (DN15 to DN25) and pressure rating (PN25), it falls under Article 4.3 of the Pressure Equipment Directive 2014\/68\/EU, with Group 1 and 2 fluids.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can it be installed in an ATEX zone?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Yes. The PRV53 carries ATEX II 2 GD marking (certificate LOM 14.034 U) and can be used in zones 1 and 2 (flammable gases, vapors, and liquids) and 21 and 22 (combustible dust), according to the temperature class that corresponds to the fluid temperature. See our article on <a href=\"https:\/\/www.valfonta.com\/en\/blog\/atex-valves\/\">ATEX valves<\/a>.<\/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\">Other excess pressure valve models<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv54\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\" alt=\"PRV54 excess pressure valve\" class=\"wp-image-181\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV54 excess pressure valve<\/b><span>DN15\u201325 and PN25 like the PRV53, but suitable for steam up to 210 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/excess-pressure-valve-model-prv55\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV45-55-700x700-1.jpg\" alt=\"PRV55 excess pressure valve\" class=\"wp-image-191\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV55 excess pressure valve<\/b><span>With diaphragm: set pressure from 0.01 barg and steam up to 150 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s1\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\" alt=\"S1 excess pressure valve\" class=\"wp-image-192\" width=\"300\" height=\"300\" loading=\"lazy\"><b>S1 excess pressure valve<\/b><span>From DN15 to DN150 and PN40, for steam up to 220 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s2\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2-PROVISIONAL-700x700-1.jpg\" alt=\"S2 excess pressure valve\" class=\"wp-image-193\" width=\"300\" height=\"300\" loading=\"lazy\"><b>S2 excess pressure valve<\/b><span>From DN15 to DN100, PN40, and set pressure from 0.02 barg.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-relief-valve-s3\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-alivio-presion-s3-s4-perspectiva-400.webp\" alt=\"S3 pressure relief valve\" class=\"wp-image-10230\" width=\"300\" height=\"300\" loading=\"lazy\"><b>S3 pressure relief valve<\/b><span>From DN15 to DN150, PN40, set pressure up to 20 barg and 220 \u00b0C.<\/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\">Request a quote for the PRV53<\/h2><p class=\"wp-block-paragraph\">Give us your installation details and we will recommend the size, the spring range for your set pressure, and the gaskets suited to the fluid and temperature.<\/p><ul class=\"wp-block-list\"><li>Fluid and operating temperature<\/li><li>Set pressure and normal operating pressure<\/li><li>Flow rate the valve must discharge<\/li><li>Connection type (threaded or flanged)<\/li><\/ul><p class=\"vf-pdp-contact wp-block-paragraph\">You can also call <a href=\"tel:+34933720888\">933 720 888<\/a>.<\/p><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f555-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"555\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/product\/655#wpcf7-f555-o1\" method=\"post\" class=\"wpcf7-form init vf-form wpcf7-acceptance-as-validation\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\" toolname=\"solicitar_oferta\" tooldescription=\"Request a quote from Valfonta for the models on this page (model, size, fluid and pressures); a member of the team will reply.\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"555\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.2.3\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f555-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=\"1792698947.3248fbd6be5c7d77\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"PRV53\" type=\"hidden\" name=\"modelo\" \/><label>Name *<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>Company<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>Email *<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>Phone<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>Application data (optional)<\/legend><label>Size<span class=\"wpcf7-form-control-wrap\" data-name=\"dn\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"dn\"><option value=\"\">Select<\/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=\"I don&#039;t know\">I don&#039;t know<\/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=\"water, air, fuel oil, nitrogen\u2026\" value=\"\" type=\"text\" name=\"fluido\" \/><\/span><\/label><label>Set pressure (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>Operating pressure (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>Flow rate to discharge<span class=\"wpcf7-form-control-wrap\" data-name=\"caudal\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"e.g. 2 m\u00b3\/h\" value=\"\" type=\"text\" name=\"caudal\" \/><\/span><\/label><label>Temperature (\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\">Message<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>I have read and accept the <a href=\"\/en\/privacy-policy\/\">privacy policy<\/a> *<\/span><\/label><input class=\"wpcf7-form-control wpcf7-submit has-spinner vf-btn vf-btn--pri\" type=\"submit\" value=\"Send request\" \/><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\">Call<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Request a quote<\/a><\/p><\/div><\/article><\/div>","protected":false},"excerpt":{"rendered":"<p>Home\u203aPressure relief valves\u203aPRV53 excess pressure valve Excess pressure valve \u00b7 Direct-acting PRV53 excess pressure valve 316L stainless Self-regulating, direct-acting, piston-balanced excess pressure valve with body, cap, and internals in 316L stainless steel. It keeps the line pressure stable and discharges the excess when the set pressure is exceeded, on liquids, compressed air, and inert gases ... <a title=\"PRV53 excess pressure valve\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/\" aria-label=\"Read more about PRV53 excess pressure valve\">Read more<\/a><\/p>\n","protected":false},"featured_media":181,"template":"","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"PRV53 excess pressure valve in 316L stainless | Valfonta","rank_math_description":"Direct-acting PRV53 excess pressure valve in 316L stainless steel. DN15 to DN25, PN25, set pressure 0.5 to 10 barg, up to 150 \u00b0C depending on gaskets.","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\/en\/\",\"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. Les Guixeres\",\"postalCode\":\"08915\",\"addressLocality\":\"Badalona\",\"addressRegion\":\"Barcelona\",\"addressCountry\":\"ES\"},\"description\":\"Design, manufacture, and sale of pressure reducing valves, pressure relief valves, and control valves.\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.valfonta.com\/#website\",\"url\":\"https:\/\/www.valfonta.com\/en\/\",\"name\":\"Valfonta\",\"publisher\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\"},{\"@type\":\"ItemPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/\",\"name\":\"PRV53 excess pressure valve in 316L stainless | Valfonta\",\"description\":\"Direct-acting PRV53 excess pressure valve in 316L stainless steel. DN15 to DN25, PN25, set pressure 0.5 to 10 barg, up to 150 \u00b0C depending on gaskets.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\",\"datePublished\":\"2020-02-05T11:48:09+02:00\",\"dateModified\":\"2026-04-30T16:45:58+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/#product\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44-700x700-1.jpg\",\"width\":\"1000\",\"height\":\"1000\",\"caption\":\"Pressure reducing valve\",\"inLanguage\":\"en\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.valfonta.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pressure relief valves\",\"item\":\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"PRV53 excess pressure valve\",\"item\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/\"}]},{\"@type\":\"Product\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/#product\",\"name\":\"PRV53 excess pressure valve\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-prv53\/\",\"description\":\"Self-regulating, direct-acting, piston-balanced excess pressure valve with body, cap, and internals in 316L stainless steel. 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Reduced Kv on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Temperature depending on gaskets\",\"value\":\"NBR: \u221220 to +80 \u00b0C \u00b7 EPDM: \u221230 to +125 \u00b0C \u00b7 Viton: \u221210 to +150 \u00b0C\"},{\"@type\":\"PropertyValue\",\"name\":\"Fluids\",\"value\":\"Group 1 and 2 liquids and gases: water, fuel oil, compressed air, nitrogen, inert gases\"},{\"@type\":\"PropertyValue\",\"name\":\"Materials\",\"value\":\"Body and cap in A351 CF3M (AISI 316L) stainless steel. Internals in AISI 316L. 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For steam, see the PRV54 (up to 210 \u00b0C), or the PRV55 (up to 150 \u00b0C).\"}},{\"@type\":\"Question\",\"name\":\"What set pressure can be adjusted?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It depends on the spring: there are three standard ranges, 0.5 to 3, 1 to 6, and 3 to 10 barg, plus a 5 to 15 barg range on request. The standard maximum inlet pressure is 10 barg.\"}},{\"@type\":\"Question\",\"name\":\"How do you adjust the set pressure of the PRV53?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With an 8 mm Allen key on the adjusting screw. Compressing the spring raises the pressure at which the valve opens; releasing it lowers it. Check the value on the inlet pressure gauge and see our guide on relief valve set pressure.\"}},{\"@type\":\"Question\",\"name\":\"What maintenance does it need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It requires no periodic maintenance, but the gaskets and wear parts should be checked according to the service conditions. This can be done with the valve installed, depressurized, and isolated. Gasket kits are available in NBR, EPDM, and FKM (PRV53.SP1 to SP3), as well as the adjusting spring (PRV53.SP5).\"}},{\"@type\":\"Question\",\"name\":\"Does the PRV53 carry CE marking?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Given its size (DN15 to DN25) and pressure rating (PN25), it falls under Article 4.3 of the Pressure Equipment Directive 2014\/68\/EU, with Group 1 and 2 fluids.\"}},{\"@type\":\"Question\",\"name\":\"Can it be installed in an ATEX zone?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The PRV53 carries ATEX II 2 GD marking (certificate LOM 14.034 U) and can be used in zones 1 and 2 (flammable gases, vapors, and liquids) and 21 and 22 (combustible dust), according to the temperature class that corresponds to the fluid temperature. See our article on ATEX valves.\"}}]}]}]"},"product_brand":[],"product_cat":[79],"product_tag":[],"class_list":["post-655","product","type-product","status-publish","has-post-thumbnail","product_cat-sin-categorizar","first","instock","shipping-taxable","purchasable","product-type-variable"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product\/655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media\/181"}],"wp:attachment":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media?parent=655"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_brand?post=655"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_cat?post=655"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_tag?post=655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}