{"product_id":"wilkins-12-p4000a-thermal-expansion-relief-valve-12","title":"Wilkins 12-P4000A | Thermal Expansion Relief Valve, 1\/2\"","description":"\u003cp\u003e\u003cstrong\u003eNOTICE:\u003c\/strong\u003e\u003cem\u003e Product images may vary from the actual item due to differences in size or configuration options.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe Wilkins 12-P4000A is a direct-acting thermal expansion relief valve designed to protect fire protection systems from destructive pressure build-up caused by thermal expansion, pumps, or elevated plumbing.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eKey Specifications:\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1\/2 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Relief Pressure Range:\u003c\/strong\u003e 50-200 psi standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Inlet Pressure:\u003c\/strong\u003e 300 psi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNotable Certifications:\u003c\/strong\u003e UL Listed, FM Approved\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Connections:\u003c\/strong\u003e NPT threaded ends\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eOther Related Variants:\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e34-P4000A:\u003c\/strong\u003e 3\/4 Inch model size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eMaterials:\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMain Valve Body \u0026amp; Cover: Cast Bronze ASTM B 806\u003c\/li\u003e\n\u003cli\u003ePlunger: No Lead Brass\u003c\/li\u003e\n\u003cli\u003eDiaphragm: Nylon Reinforced Buna-N\u003c\/li\u003e\n\u003cli\u003ePlunger Rubber: EPDM Rubber (FDA Approved)\u003c\/li\u003e\n\u003cli\u003eStem \u0026amp; Seat: Stainless Steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Installation:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp style=\"background: #f8f9fb; padding: 12px 14px; margin: 0; line-height: 1.7; color: #333;\"\u003eThe Zurn 12-P4000A can be installed in any position and is ideal for use in fire protection systems where thermal expansion, pumps or elevated plumbing could cause pressure surges within the fire protection distribution network. The Thermal Expansion Relief Valve prevents pressure build-up by venting excess pressure to atmosphere. Underwriters Laboratories requires the installation of a relief valve of not less than 1\/2\" in size on the downstream side of the pressure reducing valve. Adequate drainage for the relief valve discharge must be provided.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eStandards Compliance:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp style=\"background: #f8f9fb; border-left: 4px solid #1d85af; padding: 12px 14px; margin: 0; line-height: 1.7; color: #333;\"\u003eUL Listed; FM Approved; NFPA 13 Installation Standard; NFPA 25 Inspection, Testing and Maintenance Standard\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cu\u003eFeatures \u0026amp; Benefits:\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire Protection System Security:\u003c\/strong\u003e Relieves excess pressure in fire distribution networks, preventing damage from thermal expansion and pressure surges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Pressure Control:\u003c\/strong\u003e Standard pilot spring range of 50-200 psi allows customized pressure relief settings to match system requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrip-Tight Operation:\u003c\/strong\u003e Direct-acting spring-loaded diaphragm design closes tightly within close limits once upstream pressure drops below set pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation \u0026amp; Maintenance:\u003c\/strong\u003e Can be installed in any position with no packing glands or stuffing boxes, simplifying installation and reducing maintenance needs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between the standard and high-pressure range models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The standard Wilkins 12-P4000A has an adjustable pressure range of 50-200 psi, while the P4000AHR high-pressure variant offers a range of 150-300 psi for systems requiring higher relief pressures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this valve be used in potable water systems?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The Wilkins 12-P4000A is specifically designed and certified for fire protection systems. It features FDA-approved EPDM rubber and is UL Listed and FM Approved for fire protection applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum inlet pressure and temperature rating for this valve?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The maximum inlet pressure is 300 psi, and the temperature rating for water is 33°F to 140°F, making it suitable for standard fire protection system conditions.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv id=\"W3TucRPBpqQA9ARvwg6ni-content\"\u003e\n\u003cp\u003e\u003cspan\u003e \u003cstrong\u003eNOTICE:\u003c\/strong\u003e Do not use with water that is unsafe or of unknown quality without adequate disinfection either before or after the system. \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ci\u003e \"Hydrate Everyone, Everywhere!\" BottleFillingStations.com | \u003ca rel=\"noopener\" href=\"https:\/\/bottlefillingstations.com\/pages\/contact-us\" target=\"_blank\"\u003e Contact us \u003c\/a\u003e \u003c\/i\u003e\u003c\/p\u003e","brand":"Zurn Wilkins","offers":[{"title":"Default Title","offer_id":42983789232191,"sku":"12-P4000A","price":924.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/0985\/files\/P4000A_AF.jpg?v=1772854550","url":"https:\/\/bottlefillingstations.com\/products\/wilkins-12-p4000a-thermal-expansion-relief-valve-12","provider":"BottleFillingStations.com","version":"1.0","type":"link"}