{"id":699,"date":"2025-09-25T13:03:16","date_gmt":"2025-09-25T11:03:16","guid":{"rendered":"https:\/\/www.valfonta.com\/blog\/pressure-reducing-valves-symbology\/"},"modified":"2026-10-22T10:09:29","modified_gmt":"2026-10-22T08:09:29","slug":"pressure-reducing-valves-symbology","status":"publish","type":"post","link":"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valves-symbology\/","title":{"rendered":"Pressure reducing valve symbols: characteristics and representations"},"content":{"rendered":"<div class=\"wp-block-group vf-raiz vf-pl-articulo is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-cat-wrap is-layout-flow wp-block-group-is-layout-flow\"><article class=\"wp-block-group vf-pdp vf-post 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\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/en\/blog\/\">Blog<\/a><span class=\"vf-sep\">\u203a<\/span><span aria-current=\"page\">Pressure reducing valve symbols: characteristics and representations<\/span><\/p><\/nav><header class=\"wp-block-group vf-post-head is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-pdp-eyebrow wp-block-paragraph\"><a href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">Pressure reducing valves<\/a><\/p><h1 class=\"wp-block-heading\">Pressure reducing valve symbols: characteristics and representations<\/h1><p class=\"vf-post-meta wp-block-paragraph\"><span>By Valfonta<\/span><span><time datetime=\"2026-04-08\">Updated April 8, 2026<\/time><\/span><span>6 min read<\/span><\/p><\/header><figure class=\"wp-block-image size-full vf-post-hero is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/detalle-eyector-Valfonta.jpg\" alt=\"Pressure reducing valve symbols: characteristics and representations\" class=\"wp-image-231\" width=\"1200\" height=\"514\"\/><\/figure><div class=\"wp-block-group vf-post-grid is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-post-body is-layout-flow wp-block-group-is-layout-flow\"><aside class=\"wp-block-group vf-post-summary vfa-aria-label--In%20summary is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t wp-block-paragraph\">In summary<\/p><p class=\"wp-block-paragraph\">Pressure reducing valve symbols on P&amp;ID drawings indicate their operating principle, their function of maintaining the outlet pressure (P2), and the associated accessories. A direct-acting reducing valve is drawn with the body, a spring or diaphragm on top, and the flow arrow (M1, M2, and VD); a pilot-operated valve adds a thin line to the pilot, and a balanced valve may indicate a piston or bellows (PRV30, PRV44, and M2 with bellows). The drawing must show the strainer, isolation valves, pressure gauges, and, if applicable, a bypass.<\/p><\/aside><details class=\"wp-block-details vf-post-toc-m is-layout-flow wp-block-details-is-layout-flow\"><summary>Article contents<\/summary><div class=\"wp-block-group vf-t-ol is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#que-es-la-simbologia-de-las-valvulas-reductoras\">What are reducing valve symbols?<\/a><\/p><ol class=\"wp-block-list\"><li><a href=\"#por-que-es-importante-conocer-esta-simbologia-con-rigor\">Why is it important to know these symbols rigorously?<\/a><\/li><li><a href=\"#valvula-reductora-de-accion-directa\">Direct-acting reducing valve<\/a><\/li><li><a href=\"#valvula-reductora-con-piloto-membrana\">Pilot \/ diaphragm reducing valve<\/a><\/li><li><a href=\"#valvula-reductora-equilibrada-por-piston-o-fuelle\">Piston- or bellows-balanced reducing valve<\/a><\/li><li><a href=\"#elementos-auxiliares\">Auxiliary elements<\/a><\/li><\/ol><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#7-errores-comunes-y-como-evitarlos\">7 common mistakes (and how to avoid them)<\/a><\/p><ol class=\"wp-block-list\"><li><a href=\"#confundir-una-prv-alivio-con-una-reductora\">Confusing a PRV (relief) with a reducing valve<\/a><\/li><li><a href=\"#omitir-el-colador-aguas-arriba\">Omitting the upstream strainer<\/a><\/li><li><a href=\"#ubicar-mal-la-toma-de-presion-sensing\">Placing the pressure sensing point incorrectly (sensing)<\/a><\/li><li><a href=\"#desatender-el-mantenimiento-preventivo\">Neglecting preventive maintenance<\/a><\/li><li><a href=\"#dimensionar-por-dn-de-la-tuberia-en-vez-de-por-kv-cv\">Sizing by pipe DN (instead of by Kv\/Cv)<\/a><\/li><li><a href=\"#ignorar-la-instalacion-y-el-sentido-del-flujo\">Ignoring installation and flow direction<\/a><\/li><li><a href=\"#no-indicar-rango-de-regulacion-ni-clase-de-cierre\">Not specifying the regulation range or leakage class<\/a><\/li><li><a href=\"#algunas-preguntas-frecuentes-sobre-la-simbologia-de-las-valv\">Some frequently asked questions about pressure valve symbols<\/a><\/li><\/ol><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#preguntas\">Frequently asked questions<\/a><\/p><\/div><\/div><\/details><h2 class=\"wp-block-heading\" id=\"que-es-la-simbologia-de-las-valvulas-reductoras\"><strong>\u00a0<\/strong>\n<\/h2><p class=\"vf-hp wp-block-paragraph\"><strong><strong>What are reducing valve symbols?<\/strong><\/strong><\/p><p class=\"wp-block-paragraph\">Pressure reducing valve symbols on P&amp;ID drawings make it possible to identify unambiguously how pressure is controlled in a line, what accessories are required, and how the valve should be installed.\u00a0<\/p><p class=\"wp-block-paragraph\">A correct symbol prevents purchasing, installation, and operating errors, and speeds up maintenance. Below, we have compiled the most commonly used symbols, drawing conventions, and real examples linked to the Valfonta reducing valve families.<\/p><h3 class=\"wp-block-heading\" id=\"por-que-es-importante-conocer-esta-simbologia-con-rigor\"><strong>Why is it important to know these symbols rigorously?<\/strong><\/h3><p class=\"wp-block-paragraph\">In process engineering, the <strong>symbol of a reducing valve<\/strong> conveys, at a glance, <strong>its operating principle<\/strong> (direct-acting, pilot, bellows, or piston), its role (maintaining P2), and the associated elements (control sensing point, pressure gauge, strainer, isolation valves). Documenting these details properly reduces rework and shutdowns.<\/p><p class=\"wp-block-paragraph\">Furthermore, it is important to remember that pressure reducing valve symbols may vary slightly depending on the standard followed, but they always retain <strong>a basic principle that helps identify the essential function of the valve in pressure regulation.<\/strong> Nevertheless, the basic concepts are usually similar and are based on the idea of providing a clear and concise visual representation of the function of the valve in question.<\/p><h3 class=\"wp-block-heading\" id=\"valvula-reductora-de-accion-directa\"><strong>Direct-acting reducing valve<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Representation: <\/strong>valve body with spring\/diaphragm on top and flow arrow \u2192.<\/li><li><strong>Technical reading: <\/strong>the fluid itself acts against the spring\/diaphragm to maintain P2.<\/li><li><strong>Typical use:<\/strong> steam, industrial water, and air networks; low complexity, high reliability (<strong>M1<\/strong>, <strong>M2<\/strong>, <strong>VD<\/strong>).<\/li><\/ul><p class=\"wp-block-paragraph\"><strong>\u2192 <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\">M1 pressure reducing valve<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong> \u2192 <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2 pressure reducing valve<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong> \u2192 <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\"> VD pressure reducing valve<\/a><\/strong><\/p><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/simbolo-reductora-autoaccionada.webp\" alt=\"pressure reducing valve symbols\" class=\"wp-image-276\" width=\"500\" height=\"500\" loading=\"lazy\"\/><\/figure><h3 class=\"wp-block-heading\" id=\"valvula-reductora-con-piloto-membrana\"><strong>Pilot \/ diaphragm reducing valve<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Representation:<\/strong> main valve + thin line to the pilot (external control).<\/li><li><strong>Reading:<\/strong> better sensitivity and stability under large variations.<\/li><li><strong>Use:<\/strong> variable flows, more demanding set points.<\/li><\/ul><p class=\"wp-block-paragraph\"><strong>\u2192We do not offer this type of valve in our catalog, <a href=\"https:\/\/www.valfonta.com\/en\/control-valve-design\/\"><strong>but we can make them to order<\/strong><\/a>. Request information with no obligation. <\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<strong><a href=\"https:\/\/www.valfonta.com\/en\/contact\/\"> Contact our technical team directly<\/a><\/strong><\/strong><\/p><div class=\"wp-block-group vf-post-gallery vf-n2 is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/reductora-con-piloto.webp\" alt=\"pressure reducing valve symbols\" class=\"wp-image-277\" width=\"500\" height=\"500\" loading=\"lazy\"\/><\/figure><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/reductora-equilibrada-con-piston.webp\" alt=\"symbols for pressure reducing valves\" class=\"wp-image-278\" width=\"500\" height=\"500\" loading=\"lazy\"\/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"valvula-reductora-equilibrada-por-piston-o-fuelle\"><strong>Piston- or bellows-balanced reducing valve<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Representation: <\/strong>balanced internal element; bellows may be indicated.<\/li><li><strong>Reading:<\/strong> compensates for P1 and reduces the influence of fluctuations.<\/li><li><strong>Use:<\/strong> gases and steam with P1 fluctuations (PRV30\/44\/45, M2+Bellows).<\/li><\/ul><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv30\/\">PRV30 pressure reducing valve<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv44\/\">PRV44 pressure reducing valve<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-prv45\/\">PRV45 pressure reducing valve<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/product\/bellow-pressure-reducing-valve\/\">M2 pressure reducing valve with bellows<\/a><\/strong><\/p><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/equipos-auxiliares.webp\" alt=\"equipment - Valfonta\" class=\"wp-image-279\" width=\"500\" height=\"500\" loading=\"lazy\"\/><\/figure><h3 class=\"wp-block-heading\" id=\"elementos-auxiliares\"><strong>Auxiliary elements<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Upstream strainer (Y-strainer)<\/strong>: essential to protect the seat\/plug.<\/li><li><strong>Pressure sensing point:<\/strong> at \u226510\u00d7DN downstream or as per the datasheet.<\/li><li><strong>Pressure gauge: <\/strong>displays P2 and helps with calibration.<\/li><\/ul><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">Pressure reducing valves<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\">Pressure relief valves<\/a><\/strong><\/p><p class=\"wp-block-paragraph\"><strong>\u2192<a href=\"https:\/\/www.valfonta.com\/en\/control-valve\/\">Control valves<\/a><\/strong><\/p><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/logo.png\" alt=\"Steam pressure reducing valve\" class=\"wp-image-254\" width=\"332\" height=\"83\" loading=\"lazy\"\/><\/figure><h2 class=\"wp-block-heading\" id=\"7-errores-comunes-y-como-evitarlos\"><strong>7 common mistakes (and how to avoid them)<\/strong><\/h2><h3 class=\"wp-block-heading\" id=\"confundir-una-prv-alivio-con-una-reductora\"><strong>Confusing a PRV (relief) with a reducing valve<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens<\/strong>: a <strong>PRV\/PSV<\/strong> opens only when the pressure exceeds the set pressure, in order to <strong>depressurize<\/strong>; a <strong>reducing valve<\/strong> regulates continuously to <strong>keep P2 stable<\/strong>. Installing a PRV where regulation is needed causes sawtooth behavior, high consumption, and unnecessary popping.<br>\n<strong><\/strong><\/li><li><strong>How to avoid it<\/strong>: define the objective of the loop. If you need constant downstream pressure (P2), choose a <strong>self-operated reducing valve<\/strong> (e.g., M1\/M2\/PRV30\/PRV45\/VD). If the risk is <strong>overpressure<\/strong>, add a <strong>relief valve<\/strong> (S1\/S2\/S3 or PRV53\/54\/55) in parallel or on the critical equipment.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"omitir-el-colador-aguas-arriba\"><strong>Omitting the upstream strainer <\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens:<\/strong> entrained particles erode the <strong>seat\/plug<\/strong>, causing leaks, loss of tightness, and set point deviations. In steam, scaling accelerates wear.<br>\n<strong><\/strong><\/li><li><strong>How to avoid it<\/strong>: install a <strong>strainer<\/strong> (Y-strainer) <strong>upstream<\/strong> of the valve, with a mesh suited to the fluid (as a guide: 80\u2013200 mesh in clean water; coarser in steam\/air). Provide for blowdown and <strong>periodic maintenance<\/strong> of the screen. Leave a straight run of \u22655\u201310 DN before the reducing valve.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"ubicar-mal-la-toma-de-presion-sensing\"><strong>Placing the pressure sensing point incorrectly (sensing)<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens<\/strong>: if the sensing point is too close to the valve, after a bend, a tee, or a turbulent zone, <strong>hunting<\/strong> (oscillation) and poor repeatability can occur. In networks with variable flow, measuring at the wrong point throws the entire loop off balance.<br>\n<strong><\/strong><\/li><li><strong>How to avoid it:<\/strong> place the sensing point <strong>1\u20135 DN downstream<\/strong> on a straight run, away from disturbances (bends, pumps, on\/off valves). On long lines or lines with distributed consumers, use <strong>remote sensing<\/strong> at the point where P2 matters (e.g., the inlet of a heat exchanger). Use a clean, drainable <strong>impulse line<\/strong> that is as short as possible.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"desatender-el-mantenimiento-preventivo\"><strong>Neglecting preventive maintenance<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens:<\/strong> without inspections, the strainer clogs, the spring fatigues, and the gaskets degrade; P2 is no longer stable.<br>\n<strong><\/strong><\/li><li><strong>How to avoid it:<\/strong> schedule an <strong>annual inspection<\/strong> (or according to service severity): condition of the seat\/plug, gaskets, spring\/diaphragm, external leaks, strainer cleaning, and set point verification. Use <strong>genuine kits<\/strong> to preserve performance and certifications.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"dimensionar-por-dn-de-la-tuberia-en-vez-de-por-kv-cv\"><strong>Sizing by pipe DN (instead of by Kv\/Cv)<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens<\/strong>: a \u201cline-size\u201d valve usually ends up <strong>oversized<\/strong>, operates nearly closed, vibrates, and cavitates; or, conversely, it is undersized and throttles the flow.<br>\n<strong><\/strong><\/li><li><strong>How to avoid it<\/strong>: calculate the <strong>Kv\/Cv<\/strong> with Q, \u03c1, P1, P2, and T; choose the <strong>DN<\/strong> that meets the capacity, noise\/cavitation, and a reasonable pressure drop. If Qmin is very low, consider a <strong>reduced trim<\/strong> or <strong>two valves in parallel<\/strong> (one for \u201cpeak\u201d and one for \u201cbase\u201d load). If the pressure drop is large, also check the risk of <a href=\"https:\/\/www.valfonta.com\/en\/blog\/cavitation-in-valves\/\">cavitation in reducing valves<\/a>.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"ignorar-la-instalacion-y-el-sentido-del-flujo\"><strong>Ignoring installation and flow direction<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>What happens:<\/strong> mounting outside the recommended orientation or reversing the flow causes <strong>noise, vibration, and premature wear<\/strong>.<\/li><li><strong>How to avoid it<\/strong>: respect the <strong>flow arrow<\/strong>, mount <strong>horizontally<\/strong> with the actuator vertical when the model requires it, and leave <strong>maintenance clearance<\/strong> and straight runs before\/after.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"no-indicar-rango-de-regulacion-ni-clase-de-cierre\"><strong>Not specifying the regulation range or leakage class<\/strong><\/h3><div class=\"wp-block-group vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><strong>What happens:<\/strong> selecting \u201cby eye\u201d leads to unsuitable spring ranges (with no margin) and to seats\/leakage classes that do not meet leakage requirements (e.g., for drinking water or gases). Result: <strong>imprecision<\/strong>, spring overstress, and <strong>leaks<\/strong> when shut down.<\/p><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><strong>How to avoid it<\/strong>: define in the specification:<\/p><ul class=\"wp-block-list\"><li><strong>P1 max. \/ P2 set \/ operating \u0394P<\/strong> and <strong>flow range<\/strong> (Qmin\u2013Qmax).<\/li><li><strong>Spring range<\/strong> required (e.g.: 0.5\u20133; 1\u20138; 4\u201312 barg, etc.).<\/li><li><strong>Leakage class<\/strong> (metal-to-metal or soft: NBR\/EPDM\/PTFE), chemical compatibility, and temperature.<br>\n<strong>Standards<\/strong> (PED\/CE, ATEX if applicable) and <strong>connections<\/strong> (DIN\/ANSI\/BSP\/NPT).<\/li><li>Ask the manufacturer for the <strong>sizing sheet<\/strong> by <strong>Kv\/Cv<\/strong> and the correct <strong>spring<\/strong> with margin (set point between 30\u201370% of the range).<\/li><\/ul><\/div><\/div><figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/Valvula-de-alivio-400x400-1.webp\" alt=\"Relief valve\" class=\"wp-image-280\" width=\"400\" height=\"400\" loading=\"lazy\"\/><\/figure><h3 class=\"wp-block-heading\" id=\"algunas-preguntas-frecuentes-sobre-la-simbologia-de-las-valv\">Some frequently asked questions about pressure valve symbols<\/h3><p class=\"wp-block-paragraph\">If you have any questions or need help with <strong>anything related to reducing valve symbols or which model is best suited<\/strong> to your system, don\u2019t hesitate to fill out the contact form; we will be happy to assist you.<\/p><p class=\"wp-block-paragraph\">Our technical team can review your process data (fluid, flow, P1\/P2, temperature), <strong>propose the most efficient solution, and give you clear recommendations<\/strong> on materials, connections, and leakage class.<\/p><p class=\"wp-block-paragraph\">We can also guide you in <strong>interpreting drawings and standards, and prepare a custom proposal<\/strong> if your installation requires it. Write to us and we will reply with practical, straightforward advice.<\/p><section id=\"preguntas\" class=\"wp-block-group vf-post-faq is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Frequently asked questions<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What symbol is used for a self-operated reducing valve?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">\u00a0A valve body with spring\/diaphragm and flow arrow; a pressure sensing point and a pressure gauge may be added.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How is the pilot line represented?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">\u00a0With a thin line from the pressure sensing point to the pilot or upper chamber.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Where should the pressure sensing point be located?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">This ejector is ideal for processes that require more efficient handling of heat and energy. The use of superheated steam makes it particularly suitable for applications with high energy demands, delivering optimized performance in terms of energy efficiency and thermal management.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Which accessories should appear on the P&amp;ID?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">\u00a0Strainer, isolation valves, pressure gauges, and, if applicable, a bypass.<\/p><\/div><\/details><\/section><\/div><aside class=\"wp-block-group vf-post-aside is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-post-sticky is-layout-flow wp-block-group-is-layout-flow\"><nav class=\"wp-block-group vf-post-toc vfa-aria-label--Article%20contents is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">In this article<\/p><div class=\"wp-block-group vf-t-ol is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#que-es-la-simbologia-de-las-valvulas-reductoras\">What are reducing valve symbols?<\/a><\/p><ol class=\"wp-block-list\"><li><a href=\"#por-que-es-importante-conocer-esta-simbologia-con-rigor\">Why is it important to know these symbols rigorously?<\/a><\/li><li><a href=\"#valvula-reductora-de-accion-directa\">Direct-acting reducing valve<\/a><\/li><li><a href=\"#valvula-reductora-con-piloto-membrana\">Pilot \/ diaphragm reducing valve<\/a><\/li><li><a href=\"#valvula-reductora-equilibrada-por-piston-o-fuelle\">Piston- or bellows-balanced reducing valve<\/a><\/li><li><a href=\"#elementos-auxiliares\">Auxiliary elements<\/a><\/li><\/ol><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#7-errores-comunes-y-como-evitarlos\">7 common mistakes (and how to avoid them)<\/a><\/p><ol class=\"wp-block-list\"><li><a href=\"#confundir-una-prv-alivio-con-una-reductora\">Confusing a PRV (relief) with a reducing valve<\/a><\/li><li><a href=\"#omitir-el-colador-aguas-arriba\">Omitting the upstream strainer<\/a><\/li><li><a href=\"#ubicar-mal-la-toma-de-presion-sensing\">Placing the pressure sensing point incorrectly (sensing)<\/a><\/li><li><a href=\"#desatender-el-mantenimiento-preventivo\">Neglecting preventive maintenance<\/a><\/li><li><a href=\"#dimensionar-por-dn-de-la-tuberia-en-vez-de-por-kv-cv\">Sizing by pipe DN (instead of by Kv\/Cv)<\/a><\/li><li><a href=\"#ignorar-la-instalacion-y-el-sentido-del-flujo\">Ignoring installation and flow direction<\/a><\/li><li><a href=\"#no-indicar-rango-de-regulacion-ni-clase-de-cierre\">Not specifying the regulation range or leakage class<\/a><\/li><li><a href=\"#algunas-preguntas-frecuentes-sobre-la-simbologia-de-las-valv\">Some frequently asked questions about pressure valve symbols<\/a><\/li><\/ol><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"#preguntas\">Frequently asked questions<\/a><\/p><\/div><\/div><\/nav><div class=\"wp-block-group vf-post-cta is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-t wp-block-paragraph\">Do you need a pressure reducing valve?<\/p><p class=\"wp-block-paragraph\">We help you choose the right model and size for your installation.<\/p><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--pri\" href=\"#contactar\">Request a quote<\/a><\/p><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">View pressure reducing valves<\/a><\/p><p class=\"vf-tel wp-block-paragraph\">Or call <a href=\"tel:+34933720888\">933 720 888<\/a><\/p><\/div><\/div><\/aside><\/div><section id=\"valvulas\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Related valves<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-perspectiva-400.webp\" alt=\"M1 reducing valve\" class=\"wp-image-201\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M1 reducing valve<\/b><span>Up to DN150 and 220 \u00b0C, for steam.<\/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.jpg\" alt=\"M2 diaphragm reducing valve\" class=\"wp-image-206\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M2 diaphragm reducing valve<\/b><span>DN15\u2013100, outlet pressures from 0.02 barg, and steam up to 180 \u00b0C.<\/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>From DN15 to DN100, up to 40 bar, and steam up to 200 \u00b0C.<\/span><\/a><\/li><\/ul><p class=\"vf-post-more wp-block-paragraph\"><a href=\"https:\/\/www.valfonta.com\/en\/pressure-reducing-valves\/\">View all pressure reducing valves \u2192<\/a><\/p><\/section><section id=\"articulos\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Related articles<\/h2><div class=\"wp-block-group vf-post-cards vf-t-ul is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/engineering-communications-at-the-gas-station-KGAC2SB.jpg\" alt=\"\" class=\"wp-image-232\" width=\"400\" height=\"225\" loading=\"lazy\"><\/figure><div class=\"wp-block-group vf-in is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><small>Pressure reducing valves<\/small><b>Types of industrial pressure reducing valves<\/b><span>12 min read<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"https:\/\/www.valfonta.com\/en\/blog\/types-of-industrial-pressure-reducing-valves\/\" aria-label=\"Pressure reducing valves Types of industrial pressure reducing valves 12 min read\"><\/a><\/p><\/div><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/portada_1_como-seleccionar-una-vlvula-de-control_Valfonta.jpg\" alt=\"\" class=\"wp-image-236\" width=\"400\" height=\"225\" loading=\"lazy\"><\/figure><div class=\"wp-block-group vf-in is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><small>Pressure reducing valves<\/small><b>What problems do pressure reducing valves commonly have?<\/b><span>6 min read<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valve-problems\/\" aria-label=\"Pressure reducing valves What problems do pressure reducing valves commonly have? 6 min read\"><\/a><\/p><\/div><\/div><div class=\"wp-block-group vf-t-li is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-image vf-img-suelta\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ejemplos-de-valvulas-de-Valfonta.webp\" alt=\"\" class=\"wp-image-168\" width=\"400\" height=\"225\" loading=\"lazy\"><\/figure><div class=\"wp-block-group vf-in is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><small>Pressure reducing valves<\/small><b>Pressure reducing valves: applications and industries where they are essential<\/b><span>8 min read<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valves-applications\/\" aria-label=\"Pressure reducing valves Pressure reducing valves: applications and industries where they are essential 8 min read\"><\/a><\/p><\/div><\/div><\/div><\/section><section id=\"contactar\" 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\">Can we help with your installation?<\/h2><p class=\"wp-block-paragraph\">Tell us the fluid, the inlet and outlet pressures, the temperature, and the flow rate, and we will recommend the right valve.<\/p><p class=\"vf-pdp-contact wp-block-paragraph\">You can also call <a href=\"tel:+34933720888\">933 720 888<\/a> or email <a href=\"mailto:valfonta@valfonta.com\">valfonta@valfonta.com<\/a>.<\/p><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f535-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"535\">\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\/posts\/699#wpcf7-f535-o1\" method=\"post\" class=\"wpcf7-form init vf-form wpcf7-acceptance-as-validation\" 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class=\"vf-full\">Reason for your inquiry<span class=\"wpcf7-form-control-wrap\" data-name=\"motivo\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"motivo\"><option value=\"\">Select<\/option><option value=\"Request a quote\">Request a quote<\/option><option value=\"Technical advice on choosing a valve\">Technical advice on choosing a valve<\/option><option value=\"Spare parts or repair\">Spare parts or repair<\/option><option value=\"Documentation or certificates\">Documentation or certificates<\/option><option value=\"Other\">Other<\/option><\/select><\/span><\/label><label class=\"vf-full\">Message *<span class=\"wpcf7-form-control-wrap\" data-name=\"mensaje\"><textarea cols=\"40\" rows=\"5\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Tell us what you need: fluid, pressures, flow rate, model, or serial number\u2026\" 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 message\" \/><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=\"#contactar\">Request a quote<\/a><\/p><\/div><\/article><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Pressure reducing valve symbols on P&#038;ID drawings indicate the valve's operating principle, its function of maintaining the outlet pressure (P2), and the associated accessories.<\/p>\n","protected":false},"author":1,"featured_media":231,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"Pressure reducing valve symbols | Valfonta","rank_math_description":"Pressure reducing valve symbols: characteristics and representations. At Valfonta, you will find the support you need for your project.","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\":\"WebPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valves-symbology\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valves-symbology\/\",\"name\":\"Pressure reducing valve symbols | Valfonta\",\"description\":\"Pressure reducing valve symbols: characteristics and representations. 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At Valfonta you will find the support you need for your project.\",\"author\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"abstract\":\"Pressure reducing valve symbols on P&ID drawings indicate their operating principle, their function of maintaining the outlet pressure (P2), and the associated accessories. A direct-acting reducing valve is drawn with the body, a spring or diaphragm on top, and the flow arrow (M1, M2, and VD); a pilot-operated valve adds a thin line to the pilot, and a balanced valve may indicate a piston or bellows (PRV30, PRV44, and M2 with bellows). The drawing must show the strainer, isolation valves, pressure gauges, and, if applicable, a bypass.\"},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/blog\/pressure-reducing-valves-symbology\/#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What symbol is used for a self-operated reducing valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A valve body with spring\/diaphragm and flow arrow; a pressure sensing point and a pressure gauge may be added.\"}},{\"@type\":\"Question\",\"name\":\"How is the pilot line represented?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"With a thin line from the pressure sensing point to the pilot or upper chamber.\"}},{\"@type\":\"Question\",\"name\":\"Where should the pressure sensing point be located?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This ejector is ideal for processes that require more efficient handling of heat and energy. The use of superheated steam makes it particularly suitable for applications with high energy demands, delivering optimized performance in terms of energy efficiency and thermal management.\"}},{\"@type\":\"Question\",\"name\":\"Which accessories should appear on the P&ID?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Strainer, isolation valves, pressure gauges, and, if applicable, a bypass.\"}}]}]}]","footnotes":"","_vg_translation_of":"481","_vg_lang":"en","_vg_wpml_state":"{\"lang\":\"en\",\"trid\":\"658\",\"src\":\"es\"}"},"categories":[36],"tags":[],"class_list":["post-699","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pressure-reducing-valves"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/posts\/699","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/comments?post=699"}],"version-history":[{"count":3,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/posts\/699\/revisions"}],"predecessor-version":[{"id":10391,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/posts\/699\/revisions\/10391"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media\/231"}],"wp:attachment":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media?parent=699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/categories?post=699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/tags?post=699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}