{"id":2227,"date":"2021-12-28T10:06:16","date_gmt":"2021-12-28T10:06:16","guid":{"rendered":"https:\/\/zecovalve.com\/operation-of-the-spirax-sarco-25p-pressure-reducing-valve-zeco-valve-blog.html"},"modified":"2022-08-08T13:57:05","modified_gmt":"2022-08-08T13:57:05","slug":"operation-of-the-spirax-sarco-25p-pressure-reducing-valve-zeco-valve-blog","status":"publish","type":"post","link":"https:\/\/zecovalve.com\/fr\/operation-of-the-spirax-sarco-25p-pressure-reducing-valve-zeco-valve-blog.html","title":{"rendered":"R\u00e9ducteur de pression Spirax-Sarco 25P | Vanne Zeco"},"content":{"rendered":"<p>Cougar USA est le repr\u00e9sentant de Spirax Sarco dans la r\u00e9gion de Houston. Spirax Sarco propose une large gamme de produits de contr\u00f4le des fluides, d&#039;ensembles techniques, d&#039;expertise en syst\u00e8mes de vapeur et de services sur site pour sa gamme diversifi\u00e9e de plus de 100 000 clients industriels et institutionnels. Ils aident leurs clients \u00e0 optimiser leur capacit\u00e9 de production, \u00e0 r\u00e9duire les co\u00fbts \u00e9nerg\u00e9tiques et les \u00e9missions, \u00e0 am\u00e9liorer la qualit\u00e9 des produits et \u00e0 renforcer la s\u00e9curit\u00e9 de leurs op\u00e9rations. Spirax Sarco poss\u00e8de des usines de fabrication strat\u00e9giquement situ\u00e9es dans le monde entier, dont une pr\u00e8s de Houston, \u00e0 Pasadena, au Texas.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Qu&#039;est-ce qu&#039;un Spirax Sarco 25p ?<\/h2>\n\n\n\n<p>Les r\u00e9gulateurs Spirax Sarco s\u00e9rie 25 constituent une famille polyvalente de r\u00e9gulateurs de pression \u00e0 action automatique avec pilotes de commande et vannes principales interchangeables pour la plupart des applications de vapeur. Les options incluent une r\u00e9duction de pression (25P), une r\u00e9duction de pression combin\u00e9e avec commande marche\/arr\u00eat \u00e9lectrique (25PE), une r\u00e9duction de pression avec pilote \u00e0 air (25PA) et un r\u00e9gulateur de contre-pression (25BP). Con\u00e7ue en pensant \u00e0 l&#039;utilisateur, la s\u00e9rie 25 offre polyvalence et simplicit\u00e9. Les ressorts interchangeables \u00e0 code couleur permettent un changement rapide et facile de la plage de pression en aval, \u00e9liminant ainsi le besoin d&#039;isoler la vanne ou de casser la conduite de vapeur.<\/p>\n\n\n\n<p>Spirax Sarco <a href=\"https:\/\/zecovalve.com\/fr\/water-pressure-reducing-valve-manufacturer-zeco-valve.html\/\" data-internallinksmanager029f6b8e52c=\"8\" title=\"D\u00e9tendeur\" target=\"_blank\" rel=\"noopener\">D\u00e9tendeur<\/a>, Pilot\u00e9, 3\/4 po nominal, NPT, 250 psi, 450 deg F, corps en fonte, support : vapeur<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Composants du Spirax Sarco 25p<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Mat\u00e9riau du corps<\/strong><strong><\/strong><\/td><td>Fonte<\/td><\/tr><tr><td><strong>Style de fin<\/strong><strong><\/strong><\/td><td>TNP<\/td><\/tr><tr><td><strong>Fabricant<\/strong><strong><\/strong><\/td><td>Spirax Sarco Inc<\/td><\/tr><tr><td><strong>Fabricant #<\/strong><strong><\/strong><\/td><td>55223<\/td><\/tr><tr><td><strong>Les m\u00e9dias<\/strong><strong><\/strong><\/td><td>VAPEUR<\/td><\/tr><tr><td><strong>Taille nominale<\/strong><strong><\/strong><\/td><td>3\/4 po<\/td><\/tr><tr><td><strong>Pression nominale<\/strong><strong><\/strong><\/td><td>250 livres par pouce carr\u00e9<\/td><\/tr><tr><td><strong>Temp\u00e9rature nominale<\/strong><strong><\/strong><\/td><td>450 degr\u00e9s F<\/td><\/tr><tr><td><strong>Type<\/strong><strong><\/strong><\/td><td>Pilot\u00e9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-operation-of-the-spirax-sarco-25p-pressure-reducing-valve\">Fonctionnement du r\u00e9ducteur de pression Spirax-Sarco 25P<\/h2>\n\n\n\n<p>Le d\u00e9tendeur pilot\u00e9 Spirax-Sarco s\u00e9rie 25P est largement utilis\u00e9 dans les syst\u00e8mes \u00e0 vapeur. Un contr\u00f4le pr\u00e9cis et stable de la pression peut \u00eatre r\u00e9alis\u00e9 ind\u00e9pendamment d&#039;un changement de pression de vapeur en amont ou d&#039;une fluctuation de la charge en aval.<\/p>\n\n\n\n<p>Le d\u00e9tendeur pilot\u00e9 Spirax-Sarco s\u00e9rie 25P est unique en ce sens qu&#039;une ou plusieurs vannes pilotes peuvent \u00eatre install\u00e9es ou \u00e9chang\u00e9es sur la m\u00eame vanne. En plus d&#039;\u00eatre stable et de r\u00e9duire la pression, il peut \u00e9galement contr\u00f4ler la temp\u00e9rature, la pression en amont ou le t\u00e9l\u00e9interrupteur.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><b>Op\u00e9ration<\/b><\/h3>\n\n\n\n<p>Les positions normales avant le d\u00e9marrage sont avec la vanne principale ferm\u00e9e et la vanne pilote maintenue ouverte par la force du ressort ou la pression de l&#039;air.<\/p>\n\n\n\n<p>La vapeur entrante passe par la vanne pilote dans la chambre \u00e0 membrane principale et sort \u00e9galement par l&#039;orifice de contr\u00f4le. Lorsque le d\u00e9bit \u00e0 travers la vanne pilote d\u00e9passe le d\u00e9bit \u00e0 travers l&#039;orifice, la pression de commande augmente dans la chambre \u00e0 membrane et ouvre la vanne principale. Lorsque la vapeur s&#039;\u00e9coule \u00e0 travers la vanne principale, l&#039;augmentation de la pression en aval est r\u00e9percut\u00e9e via la conduite de d\u00e9tection de pression vers la face inf\u00e9rieure du diaphragme de pression.&nbsp;<\/p>\n\n\n\n<p>Lorsque la force en dessous de ce diaphragme \u00e9quilibre la force de compression du ressort au-dessus, la vanne pilote s&#039;\u00e9trangle. La pression de contr\u00f4le maintenue dans la chambre \u00e0 membrane principale positionne la vanne principale pour fournir juste assez de vapeur pour la pression de refoulement souhait\u00e9e. Le r\u00e9glage du ressort ou de la pression d&#039;air au-dessus du diaphragme de pression modifie le point de consigne de pression en aval.&nbsp;<\/p>\n\n\n\n<p>Lorsque la vapeur n&#039;est plus n\u00e9cessaire, la pression de la conduite de d\u00e9tection augmente, fermant le pilote de pression et la pression de contr\u00f4le reflue \u00e0 travers l&#039;orifice de contr\u00f4le. Cela permet \u00e0 la vanne principale de maintenir la pression r\u00e9duite souhait\u00e9e et elle peut se fermer herm\u00e9tiquement pour une fermeture sans issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Avantages du Spirax Sarco 25p<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>La combinaison de pilotes permet diff\u00e9rents types de contr\u00f4le dans un seul r\u00e9gulateur<\/li><li>Guide d&#039;auto-r\u00e9curage brevet\u00e9 pour un service long et sans probl\u00e8me<\/li><li>Membrane test\u00e9e en fatigue, con\u00e7ue sans piston pour \u00e9viter tout risque de coincement<\/li><li>Composants internes en acier inoxydable pour une excellente durabilit\u00e9 et r\u00e9sistance \u00e0 la corrosion<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><b><strong>Installation typique de<\/strong><\/b> Spirax Sarco 25p<\/h2>\n\n\n\n<p>Le r\u00e9gulateur doit \u00eatre install\u00e9 sur une ligne horizontale avec des vannes de d\u00e9rivation et d&#039;isolement appropri\u00e9es. Un purgeur de vapeur doit \u00eatre install\u00e9 en amont pour emp\u00eacher les condensats d&#039;atteindre le r\u00e9gulateur. Le pi\u00e8ge et le r\u00e9gulateur doivent tous deux \u00eatre prot\u00e9g\u00e9s par une cr\u00e9pine. La conduite de d\u00e9tection de pression doit \u00eatre situ\u00e9e dans une section droite de la tuyauterie en aval, \u00e0 au moins 10 diam\u00e8tres de tuyauterie du raccord le plus proche. Les instructions d&#039;installation compl\u00e8tes sont donn\u00e9es dans IMI3.000<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Entretien du Spirax Sarco 25p<\/h2>\n\n\n\n<p>Les instructions compl\u00e8tes d&#039;installation et de maintenance sont donn\u00e9es dans l&#039;IMI 3.000, dont une copie est fournie avec chaque r\u00e9gulateur. Les pi\u00e8ces de rechange disponibles sont indiqu\u00e9es sur TIS 3.027 et 3.0271.<\/p>\n\n\n\n<!-- Andy:h-related-tags -->\n<h2 id=\"h-related-tags\">Balises associ\u00e9es :<\/h2>\n<!-- \/Andy:h-related-tags -->\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/\">Soupape ZECO<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/difference-between-gate-valves-and-ball-valves.html\/\">Vanne et robinet \u00e0 boisseau sph\u00e9rique<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/advantages-and-disadvantages-of-globe-valves.html\/\">Qu'est-ce qu'un robinet \u00e0 soupape ?<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/gate-valve-problems.html\/\">R\u00e9paration de vannes \u00e0 vanne<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/what-is-an-axial-flow-silent-check-valve.html\/\">Qu'est-ce qu'un clapet anti-retour axial ?<\/a>\n\n<\/div>\n\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/produit\/manual-gate-valve\/\">Fabricant de robinets-vannes \u00e0 commande manuelle<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/the-function-of-globe-valve-in-pipeline-system.html\/\">Que sont les vannes \u00e0 soupape\u00a0?<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/difference-between-gate-valve-and-butterfly-valve.html\/\">Diff\u00e9rence entre la vanne \u00e0 vanne et la vanne papillon<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/china-gate-valves-suppliersnon-rising-stem-gate-valvesks-gate-valves.html\/\">Qu'est-ce qu'un robinet-vanne ?<\/a>\n\n<\/div>\n\n\n\n<div class=\"re_main\">\n<a href=\"https:\/\/zecovalve.com\/fr\/tag\/shanghai-pressure-reducing-valve-factory\/\">Usine de soupapes de r\u00e9duction de pression de Shanghai<\/a>\n\n<\/div>\n\n\n\n<p>Dix articles avant et apr\u00e8s<\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/negative-rate-belleville-disc-spring-for-pressure-sensing-zeco-valve-blog.html\/\">Ressort \u00e0 disque Belleville \u00e0 taux n\u00e9gatif pour d\u00e9tection de pression | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/guided-wave-radar-level-sensing-zeco-valve-blog.html\/\">D\u00e9tection de niveau radar \u00e0 ondes guid\u00e9es | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/the-operation-of-bimetallic-steam-traps-zeco-valve-blog.html\/\">Le fonctionnement des purgeurs de vapeur bim\u00e9talliques | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/selecting-a-stainless-steel-globe-or-gate-valve-zeco-valve-blog.html\/\">S\u00e9lection d&#039;un robinet \u00e0 soupape ou \u00e0 vanne en acier inoxydable | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/high-performance-butterfly-valves-for-on-off-and-throttling-service-zeco-valve-blog.html\/\">Vannes papillon haute performance pour service tout ou rien et \u00e9tranglement | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/pressure-and-temperature-switches-glossary-important-terms-to-know-part-1-zeco-valve-blog.html\/\">Glossaire des pressostats et des temp\u00e9ratures \u2013 Termes importants \u00e0 conna\u00eetre Partie 1 | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/pressure-and-temperature-switches-glossary-important-terms-to-know-part-2-zeco-valve-blog.html\/\">Glossaire des pressostats et des temp\u00e9ratures \u2013 Termes importants \u00e0 conna\u00eetre Partie 2 | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/the-sliding-gate-control-valve-zeco-valve-blog.html\/\">La vanne de commande \u00e0 portail coulissant | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/happy-holidays-and-happy-new-year-from-zeco-valve-zeco-valve-blog.html\/\">Joyeuses f\u00eates et bonne ann\u00e9e de la part de Zeco Valve | Blog des vannes Zeco<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/zecovalve.com\/fr\/heat-exchangers-for-liquid-gas-vaporization-zeco-valve-blog.html\/\">\u00c9changeurs de chaleur pour vaporisation liquide-gaz | Blog des vannes Zeco<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Cougar USA est le repr\u00e9sentant de Spirax Sarco dans la r\u00e9gion de Houston. Spirax Sarco propose une large gamme de produits de contr\u00f4le des fluides, de packages techniques,\u2026 <a title=\"R\u00e9ducteur de pression Spirax-Sarco 25P | Vanne Zeco\" class=\"read-more\" href=\"https:\/\/zecovalve.com\/fr\/operation-of-the-spirax-sarco-25p-pressure-reducing-valve-zeco-valve-blog.html\" aria-label=\"Plus sur D\u00e9tendeur Spirax-Sarco 25P | Vanne Zeco\">Lire plus<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[2368],"tags":[2651,2369,2370,2372,2373,2371],"class_list":["post-2227","post","type-post","status-publish","format-standard","hentry","category-control-valve","tag-shanghai-pressure-reducing-valve-factory","tag-spirax-sarco-25p","tag-spirax-sarco-25p-pressure-reducing-valve","tag-spirax-sarco-pressure-reducing-valve","tag-spirax-sarco-prv","tag-spirax-sarco-valves","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":false,"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/fr\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":2368,"name":"Control Valve","slug":"control-valve","term_group":0,"term_taxonomy_id":2368,"taxonomy":"category","description":"","parent":0,"count":12,"filter":"raw","cat_ID":2368,"category_count":12,"category_description":"","cat_name":"Control Valve","category_nicename":"control-valve","category_parent":0}],"tag_info":[{"term_id":2651,"name":"Shanghai Pressure Reducing Valve Factory","slug":"shanghai-pressure-reducing-valve-factory","term_group":0,"term_taxonomy_id":2651,"taxonomy":"post_tag","description":"<!-- wp:heading -->\r\n<h2 id=\"h-what-is-a-pressure-reducing-valve\">What is a Pressure Reducing Valve?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nA Pressure Reducing Valve is a self-operating valve used to control excess pressure to give a constant reduced pressure to a system. The pressure reduction regulator is another name for this valve. The primary function of pressure-reducing valves is to convert increased incoming pressure into lower outgoing pressure. They are widely utilized in the water, steam, and oil and gas sectors. So, Pressure Reducing Valve manufacturers define the valve as a self-acting automated control valve that reduces a greater uncontrolled intake pressure to a constant, lowered output pressure independent of upstream water pressure variations. We will learn about the working, different types, uses, and benefits of pressure-reducing valves in this article.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>How does a Pressure Reducing Valve work?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nWhen it does this under both flow and no-flow conditions, the type of control is known as \u2018drop tight\u2019. ZECO pressure reducing valves use a balanced spring and diaphragm to control the downstream pressure. This \u2018drop tight\u2019 feature is one of the most important criteria for any pressure reducing valves, as this stops the pressure from \u2018creeping\u2019 \u2013 a term which is used when an increase in the downstream pressure occurs under no flow conditions. A valve which will allow this \u2018creep\u2019 cannot be known as \u2018drop tight\u2019 or in fact a true pressure reducing valve, as it will eventually allow the pressure to creep up to equal the upstream pressure, which can cause significant problems and essentially negates the point of using a pressure reducing valve in the first place.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe diaphragm effectively separates all of the water contact parts and the pressure from the water supply away from the control spring and associated mechanism. The body is then protected from debris by the use of a stainless-steel strainer.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nUnder no flow conditions the downstream pressure puts back-pressure on the seat and diaphragm of the valve, which in turn overcomes the spring pressure. This means the seat moves up, forcing it to seal against the diaphragm, therefore not allowing the downstream pressure to increase.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nUnder flow conditions the back pressure against the seat is reduced thus allowing the seat to open and water to flow through the valve.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Advantages of Pressure Reducing Valves<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Direct acting pressure reducing valve is suitable for general liquids and gases.<\/li>\r\n \t<li>WRAS &amp; ACS Certifications for Drinking Water and Beverage application.<\/li>\r\n \t<li>Suitable for process automation control and many general purpose applications.<\/li>\r\n \t<li>Convenient in-style mounts either horizontally or vertically.<\/li>\r\n \t<li>Wide range capacity to handle local water supply pressure and adjust to specific pump specifications.<\/li>\r\n \t<li>Adjusting nut allows easy calibrated pressure adjustment.<\/li>\r\n \t<li>Stainless Steel 316 lower body and upper body construction for durability and compatibility.<\/li>\r\n \t<li>The balanced piston design provides a constant outlet pressure even when the inlet pressure is unstable. The supplied pressure gauge indicates the outlet pressure.<\/li>\r\n \t<li>Easy maintenance, maintenance kits are available upon request.<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nZECO Valve is the most professional Shanghai Pressure Reducing Valve Factory since 1991. If any inquiry, please contact ZECO.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":4,"filter":"raw"},{"term_id":2369,"name":"spirax sarco 25p","slug":"spirax-sarco-25p","term_group":0,"term_taxonomy_id":2369,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":2370,"name":"spirax sarco 25p pressure reducing valve","slug":"spirax-sarco-25p-pressure-reducing-valve","term_group":0,"term_taxonomy_id":2370,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":2372,"name":"spirax sarco pressure reducing valve","slug":"spirax-sarco-pressure-reducing-valve","term_group":0,"term_taxonomy_id":2372,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"},{"term_id":2373,"name":"Spirax Sarco PRV","slug":"spirax-sarco-prv","term_group":0,"term_taxonomy_id":2373,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_1cedd7-56\"} \/-->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-spirax-sarco-houston\">What is Spirax Sarco Houston?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nCougar USA is the Spirax Sarco rep in the Houston area. Spirax Sarco provides a broad range of fluid-control products, engineered packages, steam systems expertise, and site services for its diverse range of over 100,000 industrial and institutional customers. They help their customers optimize production capacity, reduce energy costs and emissions, improve product quality and enhance the safety of their operations. Spirax Sarco has strategically located manufacturing plants around the world including one near Houston in Pasadena, Texas.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>What is Spirax Sarco PRV?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nWell-designed steam systems produce clean, dry steam for delivery at high pressure \u2014 the best-quality steam at the lowest cost. Lower-pressure steam is usually needed at the point of use. Effective control demands an automatic valve that can reduce steam pressure accurately, reliably, and at a cost to suit the application. Like direct-acting pressure-reducing valves, these valves are self-powered. The pilot operation provides accurate control under large load-change conditions. Available in iron, cast steel, and stainless steel in sizes from 1\/2\u2033 to 8\u2033.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET SPIRAX SARCO PRV PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2>How does the 25P Pilot Regulator Works?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe Spirax Sarco pilot-operated pressure regulator works by balancing the downstream pressure against a control spring. This modulates a small valve head over a seat (the pilot). The flow through this seat is directed, in turn, to the main valve diaphragm, where it\r\nmodulates the main valve.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nIn order to achieve the most stable operating condition, an external pressure sensing line must be used. This allows downstream pressure to feedback to the underside of the pilot diaphragm, balancing the spring force, and causing the pilot valve to throttle. This settles the pilot valve, allowing a constant flow across the main diaphragm. This ensures that the main valve is also settled to give a stable downstream pressure.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nWhen downstream pressure rises, the pilot valve closes, and pressure is released from the main valve diaphragm through the control orifice, to close the main valve. Any variations in load or pressure will immediately be sensed on the pilot diaphragm, which will act to adjust the position of the main valve, ensuring a constant downstream pressure.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>How do Direct Operated Regulators work?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOn start-up, upstream pressure, aided by a return spring, holds the valve head against the seat in the closed position.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nDownstream pressure is set by rotating the hand wheel in a clockwise direction which compresses the control spring and extends the bellows. This downward movement is transmitted via a push rod, which causes the main valve to open.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe steam then passes through the open valve into the downstream pipework and also surrounds the bellows.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nAs downstream pressure increases, it acts through the bellows to counteract the spring force and closes the main valve when the set pressure is reached. The main valve modulates to give constant pressure.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":4,"filter":"raw"},{"term_id":2371,"name":"spirax sarco valves","slug":"spirax-sarco-valves","term_group":0,"term_taxonomy_id":2371,"taxonomy":"post_tag","description":"","parent":0,"count":1,"filter":"raw"}],"taxonomy_info":{"category":[{"value":2368,"label":"Control Valve"}],"post_tag":[{"value":2651,"label":"Shanghai Pressure Reducing Valve Factory"},{"value":2369,"label":"spirax sarco 25p"},{"value":2370,"label":"spirax sarco 25p pressure reducing valve"},{"value":2372,"label":"spirax sarco pressure reducing valve"},{"value":2373,"label":"Spirax Sarco PRV"},{"value":2371,"label":"spirax sarco valves"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Spirax-Sarco 25P Pressure Reducing Valve - Zeco Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/fr\/operation-of-the-spirax-sarco-25p-pressure-reducing-valve-zeco-valve-blog.html\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spirax-Sarco 25P Pressure Reducing Valve - Zeco Valve\" \/>\n<meta property=\"og:description\" content=\"Cougar USA is the Spirax Sarco rep in the Houston area. 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