{"id":659,"date":"2026-10-02T13:17:47","date_gmt":"2026-10-02T11:17:47","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/pressure-reducing-valves-m1\/"},"modified":"2026-10-22T09:22:28","modified_gmt":"2026-10-22T07:22:28","slug":"pressure-reducing-valves-m1","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/","title":{"rendered":"M1 pressure reducing 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 aria-hidden=\"true\" class=\"vf-sep\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">Pressure reducing valves<\/a><span aria-hidden=\"true\" class=\"vf-sep\">\u203a<\/span><span aria-current=\"page\">M1 pressure reducing valve<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--M1 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\">Pressure reducing valve \u00b7 Self-operated by diaphragm<\/p><h1 class=\"wp-block-heading\">M1 pressure reducing valve<\/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\">Steam up to 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-reductora-presion-m1-perspectiva.webp\" alt=\"M1 pressure reducing valve with diaphragm actuator, perspective view\" class=\"wp-image-213\" 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 aria-label=\"Show perspective view\" aria-pressed=\"true\" data-alt=\"M1 pressure reducing valve with diaphragm actuator, perspective view\" data-vf-thumb=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-perspectiva.webp\" type=\"button\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-perspectiva-400.webp\" alt=\"\" class=\"wp-image-201\" width=\"58\" height=\"58\" loading=\"lazy\"><\/button><button aria-label=\"Show front view\" aria-pressed=\"false\" data-alt=\"M1 pressure reducing valve with diaphragm actuator, front view\" data-vf-thumb=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-frontal.webp\" type=\"button\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-frontal-400.webp\" alt=\"\" class=\"wp-image-214\" 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\">Self-operated, single-seat reducing valve: the diaphragm controls the outlet pressure and a double-layer stainless steel bellows seals the stem, with no auxiliary power. It works with steam, compressed air, inert gases, and liquids, from DN15 to DN150.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Sizes<\/span><b>DN15 to DN150<\/b><\/li><li><span>Pressure rating<\/span><b>PN16 to PN40 \u00b7 Class 150\/300<\/b><\/li><li><span>Inlet pressure<\/span><b>up to 40 barg <small>25 barg from DN65<\/small><\/b><\/li><li><span>Outlet pressure<\/span><b>0.1 to 15 barg<\/b><\/li><li><span>Temperature<\/span><b>up to 220 \u00b0C <small>with water seal pot<\/small><\/b><\/li><li><span>Kv<\/span><b>3.5 to 240 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\/M1-15A-ESP.pdf\" rel=\"noopener\" target=\"_blank\">Download datasheet <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">Questions about 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>Bellows-sealed stem with anti-rotation system<\/li><li>Genuine spare parts using the nameplate serial number<\/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 M1 is used for<\/h2><p class=\"wp-block-paragraph\">The <strong>M1<\/strong> is a self-operated <a href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">pressure reducing valve<\/a>: the outlet pressure reaches the diaphragm through a control line and is balanced against the adjusting springs. It needs no auxiliary power and responds quickly to changes in demand.<\/p><p class=\"wp-block-paragraph\">It is the model in the range that reaches the largest size, <strong>DN150<\/strong>, and the highest temperature, <strong>220 \u00b0C<\/strong> with an EPDM+PTFE diaphragm and a condensate pot. From DN65 it incorporates a plunger that compensates for the inlet pressure.<\/p><ul class=\"vf-pdp-apps wp-block-list\"><li><b>Steam networks<\/b><span>Steam pressure reduction up to 220 \u00b0C, with a water seal pot.<\/span><\/li><li><b>Compressed air<\/b><span>Adjusting the network pressure to the value each point of use requires.<\/span><\/li><li><b>Inert gases<\/b><span>Non-flammable gas lines.<\/span><\/li><li><b>Liquids<\/b><span>Water and other liquids; above 125 \u00b0C, with a water seal pot.<\/span><\/li><li><b>High flow rates<\/b><span>Up to DN150 and a Kv of 240 m\u00b3\/h.<\/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 M1 if\u2026<\/h3><ul class=\"vf-si wp-block-list\"><li>You regulate steam or hot liquids, up to 220 \u00b0C.<\/li><li>You need sizes from DN65 to DN150 or high flow rates.<\/li><li>You want a wide outlet range, from 0.1 to 15 barg.<\/li><li>You are looking for a reducing valve with no auxiliary power and a bellows-sealed stem.<\/li><\/ul><h3 class=\"wp-block-heading\">Choose another model if\u2026<\/h3><ul class=\"vf-no wp-block-list\"><li>You need less than 0.1 barg: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2<\/a> regulates from 0.02 barg and the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv45\/\">PRV45<\/a> from 0.01 barg.<\/li><li>You use steam up to 200 \u00b0C in DN15\u201350 and do not want a water seal pot: see the <a href=\"https:\/\/www.valfonta.com\/en\/product\/bellow-pressure-reducing-valve\/\">M2F<\/a>.<\/li><li>It is a small line without steam: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv20\/\">PRV20<\/a> and the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv30\/\">PRV30<\/a>, in 316L stainless, cover DN8 to DN25.<\/li><li>You need to hold the inlet pressure, not the outlet pressure: see the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-excess-valve-s1\/\">S1<\/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\">M1 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-operated, single-seat globe reducing valve with diaphragm-compensated outlet pressure<\/td><\/tr><tr><th scope=\"row\">Sizes<\/th><td>DN15 to DN150<\/td><\/tr><tr><th scope=\"row\">Connections<\/th><td>EN 1092 PN16 to PN40 flanges \u00b7 ANSI 150\/300 flanges \u00b7 BSP or NPT thread (\u00bd\u2033 to 2\u2033)<\/td><\/tr><tr><th scope=\"row\">Pressure rating<\/th><td>PN16, PN25, or PN40 \u00b7 Class 150 or 300<\/td><\/tr><tr><th scope=\"row\">Maximum inlet pressure<\/th><td>40 barg (DN15 to DN50) \u00b7 25 barg (DN65 to DN150)<\/td><\/tr><tr><th scope=\"row\">Maximum differential pressure<\/th><td>25 bar (DN15\u201350) \u00b7 20 bar (DN65\u201380) \u00b7 16 bar (DN100\u2013150)<\/td><\/tr><tr><th scope=\"row\">Outlet pressure ranges<\/th><td>0.1\u20131.5 \u00b7 1\u20133 \u00b7 2\u20135 \u00b7 4\u20138 \u00b7 7\u201315 barg<\/td><\/tr><tr><th scope=\"row\">Kv coefficient<\/th><td>3.5 to 240 m\u00b3\/h depending on size. Reduced Kv on request<\/td><\/tr><tr><th scope=\"row\">Temperature at the actuator<\/th><td>EPDM diaphragm: \u221240 to 125 \u00b0C \u00b7 EPDM+PTFE with condensate pot: up to 220 \u00b0C<\/td><\/tr><tr><th scope=\"row\">Plug<\/th><td>Graphite-filled PTFE as standard (220 \u00b0C). Also NBR (80 \u00b0C), PEEK, EPDM\u2026<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Steam, compressed air, inert gases, and liquids<\/td><\/tr><tr><th scope=\"row\">Materials<\/th><td>Body in RG10 bronze, A216 WCB carbon steel, or A351 CF3M stainless. AISI 316L stainless internals. Double-layer AISI 316Ti bellows<\/td><\/tr><tr><th scope=\"row\">Pressure sensing point<\/th><td>External control line, 10 \u00d7 1 mm tubing<\/td><\/tr><tr><th scope=\"row\">Mounting position<\/th><td>Horizontal pipe, actuator facing down (facing up only with gases and liquids up to 80 \u00b0C)<\/td><\/tr><tr><th scope=\"row\">Pressure Equipment Directive<\/th><td>PED 2014\/68\/EU: the nameplate indicates whether CE marking is required<\/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>Monel or bronze internals \u00b7 pressure sensing in the body (settings above 1 bar) \u00b7 duplex or super duplex body \u00b7 weld ends<\/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\">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><th scope=\"col\">DN125<\/th><th scope=\"col\">DN150<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Kv (m\u00b3\/h)<\/th><td>3,5<\/td><td>5<\/td><td>9<\/td><td>13,5<\/td><td>22<\/td><td>32<\/td><td>57<\/td><td>82<\/td><td>115<\/td><td>190<\/td><td>240<\/td><\/tr><tr><th scope=\"row\">Length A (EN)<\/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><td>400<\/td><td>480<\/td><\/tr><tr><th scope=\"row\">Length A (ANSI 150)<\/th><td>\u25cb<\/td><td>\u25cb<\/td><td>184<\/td><td>\u2013<\/td><td>222<\/td><td>254<\/td><td>276<\/td><td>298,5<\/td><td>352,5<\/td><td>\u2013<\/td><td>451<\/td><\/tr><tr><th scope=\"row\">Length A (ANSI 300)<\/th><td>\u25cb<\/td><td>\u25cb<\/td><td>197<\/td><td>\u2013<\/td><td>235<\/td><td>267<\/td><td>292<\/td><td>317,5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">Height L<\/th><td>440<\/td><td>445<\/td><td>450<\/td><td>455<\/td><td>463<\/td><td>475<\/td><td>560<\/td><td>560<\/td><td>575<\/td><td>600<\/td><td>640<\/td><\/tr><tr><th scope=\"row\">Weight (kg)<\/th><td>20<\/td><td>22<\/td><td>24<\/td><td>28<\/td><td>32<\/td><td>35<\/td><td>52<\/td><td>57<\/td><td>68<\/td><td>85<\/td><td>105<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Dimensions in millimeters. \u25cb: on request. For DN150, 450 mm length on request.<\/p><h3 class=\"wp-block-heading\">Outlet ranges and actuator diameter (mm)<\/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\">Range (barg)<\/th><th scope=\"col\">DN15\u201320<\/th><th scope=\"col\">DN25\u201332<\/th><th scope=\"col\">DN40\u201350<\/th><th scope=\"col\">DN65<\/th><th scope=\"col\">DN80<\/th><th scope=\"col\">DN100<\/th><th scope=\"col\">DN125<\/th><th scope=\"col\">DN150<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">0,1 \u2013 1,5<\/th><td>295<\/td><td>295<\/td><td>295<\/td><td>295<\/td><td>350<\/td><td>350<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">1 \u2013 3<\/th><td>255<\/td><td>255<\/td><td>255<\/td><td>255<\/td><td>295<\/td><td>295<\/td><td>295<\/td><td>350<\/td><\/tr><tr><th scope=\"row\">2 \u2013 5<\/th><td>230<\/td><td>230<\/td><td>230<\/td><td>230<\/td><td>255<\/td><td>255<\/td><td>255<\/td><td>295<\/td><\/tr><tr><th scope=\"row\">4 \u2013 8<\/th><td>195<\/td><td>195<\/td><td>195<\/td><td>195<\/td><td>230<\/td><td>230<\/td><td>230<\/td><td>255<\/td><\/tr><tr><th scope=\"row\">7 \u2013 15<\/th><td>175<\/td><td>175<\/td><td>175<\/td><td>175<\/td><td>195<\/td><td>195<\/td><td>195<\/td><td>230<\/td><\/tr><\/tbody><\/table><\/figure><\/div><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Exploded view and materials (44 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>RG10, 1.0619 (GS-C25N), or 1.4408<\/td><\/tr><tr><th scope=\"row\">3<\/th><td>Seat guide<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">4<\/th><td>Bushing<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">5<\/th><td>Bushing washer<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">6<\/th><td>Cover<\/td><td>Steel 1.1191 or 1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">7<\/th><td>Screws<\/td><td>Steel 8.8 or A2 stainless<\/td><\/tr><tr><th scope=\"row\">8<\/th><td>Bellows guide<\/td><td>Steel 1.0570, 1.1191, or 316L<\/td><\/tr><tr><th scope=\"row\">9<\/th><td>O-ring or gasket<\/td><td>Viton or graphite + SS304<\/td><\/tr><tr><th scope=\"row\">10<\/th><td>Springs<\/td><td>Steel 1.0904 (55Si7)<\/td><\/tr><tr><th scope=\"row\">11<\/th><td>Bearing<\/td><td>Steel 1.3505 (100Cr6)<\/td><\/tr><tr><th scope=\"row\">12<\/th><td>Upper spring support<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">13<\/th><td>Adjusting nut<\/td><td>Steel 8.8<\/td><\/tr><tr><th scope=\"row\">14<\/th><td>Plate<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">15<\/th><td>M12 nut<\/td><td>Steel 8.8<\/td><\/tr><tr><th scope=\"row\">16<\/th><td>Diaphragm stem guide<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">17<\/th><td>Nut<\/td><td>Steel 8.8<\/td><\/tr><tr><th scope=\"row\">18<\/th><td>Fitting<\/td><td>Brass or stainless<\/td><\/tr><tr><th scope=\"row\">19<\/th><td>Diaphragm<\/td><td>EPDM, EPDM+PTFE, NBR, Viton\u2026<\/td><\/tr><tr><th scope=\"row\">20<\/th><td>Upper actuator<\/td><td>Steel sheet 1.0335 epoxy or 316 stainless<\/td><\/tr><tr><th scope=\"row\">21<\/th><td>Diaphragm nut<\/td><td>1.4301 (304)<\/td><\/tr><tr><th scope=\"row\">22<\/th><td>O-ring<\/td><td>Viton<\/td><\/tr><tr><th scope=\"row\">23<\/th><td>Diaphragm plate<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">24<\/th><td>Diaphragm stem<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">25<\/th><td>Screw<\/td><td>A2 stainless<\/td><\/tr><tr><th scope=\"row\">25b<\/th><td>Nut<\/td><td>A2 stainless<\/td><\/tr><tr><th scope=\"row\">26<\/th><td>Lower actuator<\/td><td>Steel sheet 1.0335 epoxy or 316 stainless<\/td><\/tr><tr><th scope=\"row\">27<\/th><td>Screw<\/td><td>Steel 8.8<\/td><\/tr><tr><th scope=\"row\">28<\/th><td>Anti-rotation system<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">29<\/th><td>Adjusting stem<\/td><td>1.4301 (304)<\/td><\/tr><tr><th scope=\"row\">30<\/th><td>Bearing guide<\/td><td>1.4307 (304L)<\/td><\/tr><tr><th scope=\"row\">31<\/th><td>Column<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">32<\/th><td>Bellows guide nut<\/td><td>Steel 1.1191 or 1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">33<\/th><td>Bellows<\/td><td>AISI 316Ti stainless<\/td><\/tr><tr><th scope=\"row\">34<\/th><td>Lower spring support<\/td><td>Steel 1.1191<\/td><\/tr><tr><th scope=\"row\">35<\/th><td>Body gasket<\/td><td>Graphite + SS304<\/td><\/tr><tr><th scope=\"row\">35b<\/th><td>Guide gasket<\/td><td>Graphite + SS304<\/td><\/tr><tr><th scope=\"row\">36<\/th><td>Bushing guide<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">37<\/th><td>Balancing collar<\/td><td>Graphite-filled PTFE<\/td><\/tr><tr><th scope=\"row\">38<\/th><td>Allen screw<\/td><td>A2 stainless<\/td><\/tr><tr><th scope=\"row\">39<\/th><td>Seat holder<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">40<\/th><td>Plug seat<\/td><td>Graphite-filled PTFE<\/td><\/tr><tr><th scope=\"row\">41<\/th><td>Washer<\/td><td>A2 stainless<\/td><\/tr><tr><th scope=\"row\">42<\/th><td>Nut<\/td><td>1.4404 (316L)<\/td><\/tr><tr><th scope=\"row\">45<\/th><td>Seat bushing<\/td><td>1.4404 (316L)<\/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\"><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\">How the M1 works<\/h2><p class=\"wp-block-paragraph\">Balance of forces between the adjusting springs and the outlet pressure acting on the diaphragm: the valve closes when the downstream pressure rises.<\/p><ol class=\"vf-steps wp-block-list\"><li><b>Fluid inlet.<\/b> The fluid enters in the direction of the arrow and moves the plug, whose position sets the flow rate.<\/li><li><b>Adjustment.<\/b> The adjusting nut tensions the springs and sets the outlet pressure.<\/li><li><b>Sensing at the diaphragm.<\/b> The outlet pressure reaches the diaphragm through the control line and opposes the springs, moving the plug.<\/li><li><b>Proportional closing.<\/b> If the pressure exceeds the set value, the valve closes proportionally until the set value is restored.<\/li><li><b>Compensation from DN65.<\/b> A plunger balances the inlet pressure and absorbs its fluctuations.<\/li><\/ol><p class=\"wp-block-paragraph\">Piston or diaphragm? See our <a href=\"https:\/\/www.valfonta.com\/en\/blog\/piston-vs-diaphragm\/\">comparison of piston and diaphragm reducing valves<\/a>.<\/p><\/div><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-video\"><video height=\"1080\" style=\"aspect-ratio: 1920 \/ 1080;\" width=\"1920\" controls playsinline preload=\"none\" poster=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/M1-VIDEO.mp4\"><\/video><\/figure><p class=\"vf-note vf-s-d43169 wp-block-paragraph\">Video of the M1 model.<\/p><\/div><\/div><\/section><section id=\"instalacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">M1 installation<\/h2><p class=\"wp-block-paragraph\">Recommended layout: bypass, shutoff valves, strainer, pressure gauges, and safety valve. In addition, the M1 needs a <strong>control line<\/strong> and, with steam or liquids above 125 \u00b0C, a <strong>condensate pot<\/strong> (water seal pot). More details in our guides on <a href=\"https:\/\/www.valfonta.com\/en\/blog\/how-to-install-pressure-reducing-valve\/\">how to install a pressure reducing valve<\/a> and on the <a href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valve-for-steam-valfonta\/\">pressure reducing valve for steam<\/a>.<\/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 aria-label=\"Recommended installation diagram of a pressure reducing valve, with bypass\" role=\"img\" viewbox=\"0 0 900 230\"><path d=\"M20 120 H880\" fill=\"none\" stroke=\"#9aa0a6\" stroke-width=\"6\"><\/path><path d=\"M70 120 V40 H760 V120\" fill=\"none\" stroke=\"#9aa0a6\" stroke-dasharray=\"2 0\" stroke-width=\"4\"><\/path><path d=\"M865 120 l14 0 -10 -7 m10 7 -10 7\" fill=\"none\" stroke=\"#1e2123\" stroke-width=\"3\"><\/path><g><path d=\"M415 40 l-14 -10 v20 z M415 40 l14 -10 v20 z\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/path><line stroke=\"#1e2123\" stroke-width=\"2\" x1=\"415\" x2=\"415\" y1=\"40\" y2=\"22\"><\/line><rect fill=\"#1e2123\" height=\"4\" width=\"16\" x=\"407\" y=\"18\"><\/rect><circle cx=\"415\" cy=\"72\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"415\" y=\"76\">1b<\/text><\/g><g><path d=\"M130 120 l-14 -10 v20 z M130 120 l14 -10 v20 z\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/path><line stroke=\"#1e2123\" stroke-width=\"2\" x1=\"130\" x2=\"130\" y1=\"120\" y2=\"102\"><\/line><rect fill=\"#1e2123\" height=\"4\" width=\"16\" x=\"122\" y=\"98\"><\/rect><circle cx=\"130\" cy=\"152\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"130\" y=\"156\">1<\/text><\/g><g><rect fill=\"#fff\" height=\"36\" rx=\"4\" stroke=\"#1e2123\" stroke-width=\"2\" width=\"60\" x=\"195\" y=\"102\"><\/rect><circle cx=\"225\" cy=\"160\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"225\" y=\"164\">2<\/text><\/g><path d=\"M205 112 h40 M205 120 h40 M205 128 h40\" stroke=\"#1e2123\" stroke-width=\"1.5\"><\/path><g><line stroke=\"#1e2123\" stroke-width=\"2\" x1=\"300\" x2=\"300\" y1=\"116\" y2=\"90\"><\/line><circle cx=\"300\" cy=\"77\" fill=\"#fff\" r=\"13\" stroke=\"#1e2123\" stroke-width=\"2\"><\/circle><line stroke=\"#e6305d\" stroke-width=\"2\" x1=\"300\" x2=\"307\" y1=\"77\" y2=\"70\"><\/line><circle cx=\"324\" cy=\"64\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"324\" y=\"68\">3<\/text><\/g><g><rect fill=\"#fdecf1\" height=\"68\" rx=\"4\" stroke=\"#e6305d\" stroke-width=\"2\" width=\"110\" x=\"360\" y=\"86\"><\/rect><circle cx=\"415\" cy=\"176\" fill=\"#e6305d\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"415\" y=\"180\">4<\/text><\/g><path d=\"M392 120 h46 l-10 -8 m10 8 -10 8\" fill=\"none\" stroke=\"#e6305d\" stroke-width=\"2.5\"><\/path><g><rect fill=\"#fff\" height=\"34\" rx=\"4\" stroke=\"#1e2123\" stroke-width=\"2\" width=\"26\" x=\"610\" y=\"68\"><\/rect><circle cx=\"623\" cy=\"124\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"623\" y=\"128\">5<\/text><\/g><path d=\"M623 102 V117\" stroke=\"#1e2123\" stroke-width=\"2\"><\/path><g><line stroke=\"#1e2123\" stroke-width=\"2\" x1=\"690\" x2=\"690\" y1=\"116\" y2=\"90\"><\/line><circle cx=\"690\" cy=\"77\" fill=\"#fff\" r=\"13\" stroke=\"#1e2123\" stroke-width=\"2\"><\/circle><line stroke=\"#e6305d\" stroke-width=\"2\" x1=\"690\" x2=\"697\" y1=\"77\" y2=\"70\"><\/line><circle cx=\"714\" cy=\"64\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"714\" y=\"68\">6<\/text><\/g><g><path d=\"M800 120 l-14 -10 v20 z M800 120 l14 -10 v20 z\" fill=\"#fff\" stroke=\"#1e2123\" stroke-width=\"2\"><\/path><line stroke=\"#1e2123\" stroke-width=\"2\" x1=\"800\" x2=\"800\" y1=\"120\" y2=\"102\"><\/line><rect fill=\"#1e2123\" height=\"4\" width=\"16\" x=\"792\" y=\"98\"><\/rect><circle cx=\"800\" cy=\"152\" fill=\"#1e2123\" r=\"11\"><\/circle><text fill=\"#fff\" font-family=\"Montserrat,Arial\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\" x=\"800\" y=\"156\">1a<\/text><\/g><\/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>Shutoff valves (1, 1a) and bypass valve (1b)<\/li><li>Strainer<\/li><li>Inlet pressure gauge<\/li><li>M1 reducing valve<\/li><li>Safety valve<\/li><li>Outlet pressure gauge<\/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> and install a strainer upstream to protect the seat.<\/li><li><b>Install the valve in a horizontal pipe<\/b>, following the arrow on the body. If condensate is present, give the pipe a slight downward slope.<\/li><li><b>Point the actuator downward<\/b>, the standard position. Upward only with gases and liquids up to 80 \u00b0C; never horizontal.<\/li><li><b>Support the pipe<\/b> close to the flanges, never the valve or the actuator.<\/li><li><b>Connect the control line<\/b> (10 \u00d7 1 mm tubing) in the reduced-pressure zone, at least 1 m from the outlet, or to the manifold if there is one. If the valve oscillates, add a needle valve.<\/li><li><b>With steam or above 125 \u00b0C, install the water seal pot<\/b> at the highest point, connected from the side and with a slight slope toward the pipe. Fill it with water until it overflows and close the cap.<\/li><li><b>Connect the bypass<\/b> beyond the pressure sensing point and open the shutoff valves slowly to avoid water hammer.<\/li><li><b>Adjust the outlet pressure<\/b> with the adjusting nut: compressing the springs (clockwise) raises it; releasing them lowers it.<\/li><\/ol><p class=\"wp-block-paragraph\">Installation must be carried out by specialized personnel. In ATEX zones, ensure electrical conductivity between the valve and the installation. If the pressure fluctuates, review the <a href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valve-problems\/\">most common reducing valve problems<\/a>.<\/p><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">M1 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>M1 datasheet<\/b><span>PDF \u00b7 8 pages \u00b7 features, exploded view, dimensions, and installation<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/M1-15A-ESP.pdf\" aria-label=\"PDF M1 datasheet PDF \u00b7 8 pages \u00b7 features, exploded view, dimensions, and installation\" rel=\"noopener\" target=\"_blank\"><\/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 17 pages \u00b7 installation, ATEX, troubleshooting, and disassembly<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/manual-M1-15B-ESP.pdf\" aria-label=\"PDF Operation and installation manual PDF \u00b7 17 pages \u00b7 installation, ATEX, troubleshooting, and disassembly\" rel=\"noopener\" target=\"_blank\"><\/a><\/p><\/div><\/div><p class=\"wp-block-paragraph\">Order and ATEX documentation: see our <a href=\"https:\/\/www.valfonta.com\/en\/certificates\/\">quality certificates<\/a>.<\/p><\/section><section id=\"comparar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">M1 vs. other Valfonta reducing valves<\/h2><p class=\"wp-block-paragraph\">The M1 is the only reducing valve in the range that reaches DN150 and 220 \u00b0C. Check whether another model 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\">Max. inlet (barg)<\/th><th scope=\"col\">Outlet (barg)<\/th><th scope=\"col\">Max. T (\u00b0C)<\/th><th scope=\"col\">Steam<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv30\/\">PRV30<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>25<\/td><td>0,5 \u2013 12<\/td><td>80 (125\u2013150)<\/td><td>No<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv20\/\">PRV20<\/a><\/th><td>8 \u2013 20<\/td><td>40<\/td><td>40<\/td><td>0,2 \u2013 20<\/td><td>150<\/td><td>No<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv44\/\">PRV44<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>25<\/td><td>0,5 \u2013 12<\/td><td>210<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv45\/\">PRV45<\/a><\/th><td>15 \u2013 25<\/td><td>25<\/td><td>16<\/td><td>0,01 \u2013 8<\/td><td>150<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\">VD<\/a><\/th><td>15 \u2013 100<\/td><td>40<\/td><td>40<\/td><td>1,5 \u2013 16<\/td><td>200<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-class=\"vf-cur\"><\/span>M1<\/th><td>15 \u2013 150<\/td><td>40<\/td><td>40<\/td><td>0,1 \u2013 15<\/td><td>220<\/td><td>Yes<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2<\/a><\/th><td>15 \u2013 100<\/td><td>40<\/td><td>40<\/td><td>0,02 \u2013 10<\/td><td>180<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Temperature in parentheses: with EPDM or Viton gaskets. Data from the Valfonta general reducing valve catalog (2025).<\/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 M1<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can the M1 be used with steam?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Yes, up to 220 \u00b0C, with an EPDM+PTFE diaphragm and a condensate pot on the control line. With an EPDM diaphragm, the limit is 125 \u00b0C.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>When is the condensate pot required?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">With steam and with liquids above 125 \u00b0C. The water seal pot, filled with water, protects the diaphragm from overheating and always goes at the highest point of the line.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What outlet pressure can be set?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">From 0.1 to 15 barg, in five ranges, each with its own actuator. The inlet accepts 40 barg up to DN50 and 25 barg from DN65. See <a href=\"https:\/\/www.valfonta.com\/en\/blog\/how-it-regulate-a-pressure-reducing-valve\/\">how a reducing valve is adjusted<\/a>.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What should I do if the pressure fluctuates at low flow rates?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">If the pressure drop is very large, install two reducing valves in series. Also check that the control sensing point is at least 1 m away and, if the valve is too large, replace the 10 \u00d7 1 tubing with 6 \u00d7 4 tubing.<\/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\">Periodically inspect gaskets and wear parts, with the valve installed, depressurized, and isolated. For spare parts, give the serial number on the nameplate.<\/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. It carries ATEX II 2 GD marking (certificate LOM 14.034 U) for zones 1, 2, 21, and 22, depending on the temperature class of the fluid. More in <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 pressure reducing valve models<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/bellow-pressure-reducing-valve\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2F.jpg\" alt=\"M2F bellows reducing valve\" class=\"wp-image-209\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M2F bellows reducing valve<\/b><span>DN15\u201350 and steam up to 200 \u00b0C without a water seal pot.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2-PROVISIONAL-700x700-1.jpg\" alt=\"M2 diaphragm reducing valve\" class=\"wp-image-193\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M2 diaphragm reducing valve<\/b><span>DN15\u2013100 and outlet pressures from 0.02 barg.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv44\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV30-44.jpg\" alt=\"PRV44 reducing valve\" class=\"wp-image-207\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV44 reducing valve<\/b><span>DN15\u201325, steam up to 210 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv45\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV45-55-700x700-1.jpg\" alt=\"PRV45 reducing valve\" class=\"wp-image-191\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV45 reducing valve<\/b><span>Outlet pressures from 0.01 barg; suitable for steam.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-vd-perspectiva-400.webp\" alt=\"VD reducing valve\" class=\"wp-image-10116\" width=\"300\" height=\"300\" loading=\"lazy\"><b>VD reducing valve<\/b><span>DN15\u2013100, 40 bar, and steam up to 200 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv30\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-prv30-frontal-400.webp\" alt=\"PRV30 reducing valve\" class=\"wp-image-199\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV30 reducing valve<\/b><span>316L stainless, DN15\u201325.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv20\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-PRV20-FOTO.jpg\" alt=\"PRV20 reducing valve\" class=\"wp-image-215\" width=\"300\" height=\"300\" loading=\"lazy\"><b>PRV20 reducing valve<\/b><span>316L stainless, DN8\u201320 and 40 bar.<\/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 M1<\/h2><p class=\"wp-block-paragraph\">Give us your installation details and we will recommend the size, the actuator, and whether you need a condensate pot.<\/p><ul class=\"wp-block-list\"><li>Fluid and operating temperature<\/li><li>Inlet pressure and desired outlet pressure<\/li><li>Maximum and minimum flow rate<\/li><li>Size, connection, and body material<\/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-f559-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"559\">\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\/659#wpcf7-f559-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=\"559\" \/><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-f559-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=\"1792698982.0072b449fe40dbed\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"M1\" 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=\"DN32\">DN32<\/option><option value=\"DN40\">DN40<\/option><option value=\"DN50\">DN50<\/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=\"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=\"steam, compressed air, water\u2026\" value=\"\" type=\"text\" name=\"fluido\" \/><\/span><\/label><label>Inlet pressure (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"p_entrada\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"p_entrada\" \/><\/span><\/label><label>Required outlet pressure (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"p_salida\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"p_salida\" \/><\/span><\/label><label>Flow rate<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 reducing valves\u203aM1 pressure reducing valve Pressure reducing valve \u00b7 Self-operated by diaphragm M1 pressure reducing valve Steam up to 220 \u00b0C Self-operated, single-seat reducing valve: the diaphragm controls the outlet pressure and a double-layer stainless steel bellows seals the stem, with no auxiliary power. It works with steam, compressed air, inert gases, and liquids, ... <a title=\"M1 pressure reducing valve\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\" aria-label=\"Read more about M1 pressure reducing valve\">Read more<\/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":"M1 self-operated pressure reducing valve | Valfonta","rank_math_description":"M1 pressure reducing valve, diaphragm self-operated, with double-layer bellows. DN15 to DN150, inlet up to 40 barg, outlet 0.1\u201315 barg, steam at 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\/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-reducing-valves-m1\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\",\"name\":\"M1 self-operated pressure reducing valve | Valfonta\",\"description\":\"M1 pressure reducing valve, diaphragm self-operated, with double-layer bellows. DN15 to DN150, inlet up to 40 barg, outlet 0.1\u201315 barg, steam at 220 \u00b0C.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\",\"datePublished\":\"2020-02-04T13:29:09+02:00\",\"dateModified\":\"2026-03-19T14:49:30+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/#product\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\",\"width\":\"1000\",\"height\":\"1000\",\"caption\":\"Pressure reducing valve\",\"inLanguage\":\"en\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.valfonta.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Pressure reducing valves\",\"item\":\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"M1 pressure reducing valve\",\"item\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\"}]},{\"@type\":\"Product\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/#product\",\"name\":\"M1 pressure reducing valve\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\",\"description\":\"Self-operated, single-seat reducing valve: the diaphragm controls the outlet pressure and a double-layer stainless steel bellows seals the stem, with no auxiliary power. It works with steam, compressed air, inert gases, and liquids, from DN15 to DN150.\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Valfonta\"},\"manufacturer\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"model\":\"M1\",\"image\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M1-S1-3D-700x700-1.jpg\",\"material\":\"Bronze RG10, carbon steel A216 WCB, or stainless steel A351 CF3M\",\"additionalProperty\":[{\"@type\":\"PropertyValue\",\"name\":\"Type\",\"value\":\"Self-operated, single-seat globe reducing valve with diaphragm-compensated outlet pressure\"},{\"@type\":\"PropertyValue\",\"name\":\"Sizes\",\"value\":\"DN15 to DN150\"},{\"@type\":\"PropertyValue\",\"name\":\"Connections\",\"value\":\"EN 1092 PN16 to PN40 flanges \u00b7 ANSI 150\/300 flanges \u00b7 BSP or NPT thread (\u00bd\u2033 to 2\u2033)\"},{\"@type\":\"PropertyValue\",\"name\":\"Pressure rating\",\"value\":\"PN16, PN25, or PN40 \u00b7 Class 150 or 300\"},{\"@type\":\"PropertyValue\",\"name\":\"Maximum inlet pressure\",\"value\":\"40 barg (DN15 to DN50) \u00b7 25 barg (DN65 to DN150)\"},{\"@type\":\"PropertyValue\",\"name\":\"Maximum differential pressure\",\"value\":\"25 bar (DN15\u201350) \u00b7 20 bar (DN65\u201380) \u00b7 16 bar (DN100\u2013150)\"},{\"@type\":\"PropertyValue\",\"name\":\"Outlet pressure ranges\",\"value\":\"0.1\u20131.5 \u00b7 1\u20133 \u00b7 2\u20135 \u00b7 4\u20138 \u00b7 7\u201315 barg\"},{\"@type\":\"PropertyValue\",\"name\":\"Kv coefficient\",\"value\":\"3.5 to 240 m\u00b3\/h depending on size. Reduced Kv on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Temperature at the actuator\",\"value\":\"EPDM diaphragm: \u221240 to 125 \u00b0C \u00b7 EPDM+PTFE with condensate pot: up to 220 \u00b0C\"},{\"@type\":\"PropertyValue\",\"name\":\"Plug\",\"value\":\"Graphite-filled PTFE as standard (220 \u00b0C). Also NBR (80 \u00b0C), PEEK, EPDM\u2026\"},{\"@type\":\"PropertyValue\",\"name\":\"Fluids\",\"value\":\"Steam, compressed air, inert gases, and liquids\"},{\"@type\":\"PropertyValue\",\"name\":\"Materials\",\"value\":\"Body in RG10 bronze, A216 WCB carbon steel, or A351 CF3M stainless. AISI 316L stainless internals. 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With an EPDM diaphragm, the limit is 125 \u00b0C.\"}},{\"@type\":\"Question\",\"name\":\"When is the condensate pot required?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With steam and with liquids above 125 \u00b0C. The water seal pot, filled with water, protects the diaphragm from overheating and always goes at the highest point of the line.\"}},{\"@type\":\"Question\",\"name\":\"What outlet pressure can be set?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"From 0.1 to 15 barg, in five ranges, each with its own actuator. The inlet accepts 40 barg up to DN50 and 25 barg from DN65. See how a reducing valve is adjusted.\"}},{\"@type\":\"Question\",\"name\":\"What should I do if the pressure fluctuates at low flow rates?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If the pressure drop is very large, install two reducing valves in series. Also check that the control sensing point is at least 1 m away and, if the valve is too large, replace the 10 \u00d7 1 tubing with 6 \u00d7 4 tubing.\"}},{\"@type\":\"Question\",\"name\":\"What maintenance does it need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Periodically inspect gaskets and wear parts, with the valve installed, depressurized, and isolated. For spare parts, give the serial number on the nameplate.\"}},{\"@type\":\"Question\",\"name\":\"Can it be installed in an ATEX zone?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. It carries ATEX II 2 GD marking (certificate LOM 14.034 U) for zones 1, 2, 21, and 22, depending on the temperature class of the fluid. More in ATEX valves.\"}}]}]}]"},"product_brand":[],"product_cat":[79],"product_tag":[],"class_list":["post-659","product","type-product","status-publish","product_cat-sin-categorizar","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product\/659","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:attachment":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media?parent=659"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_brand?post=659"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_cat?post=659"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_tag?post=659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}