{"product_id":"mcdonnell-miller-181905lf-250-3-4-60-pressure-relief-valve","title":"McDonnell \u0026 Miller 181905LF 250-3\/4-60 Pressure Relief Valve","description":"\u003cp\u003eProtect your hydronic heating system from over-pressurization with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 181905LF\u003c\/strong\u003e pressure relief valve. This high-quality \u003cstrong\u003e250-3\/4-60\u003c\/strong\u003e model acts as a critical safety device, designed to automatically discharge fluid when system pressure exceeds the preset limits, effectively preventing equipment failure and catastrophic damage.\u003c\/p\u003e\u003cp\u003eThe mechanism operates through a spring-loaded seat that maintains a tight seal during normal operation. As the pressure rises toward the set threshold, the internal spring compresses, allowing the valve to open and relieve the excess capacity, ensuring the system remains within safe operating parameters before reseating tightly once pressure drops.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Setting:\u003c\/strong\u003e Factory calibrated for precise threshold engagement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Type:\u003c\/strong\u003e Standard 3\/4 inch NPT inlet\/outlet for easy piping integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Built to withstand industrial hydronic heating environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompliance:\u003c\/strong\u003e Engineered to meet rigorous safety standards for pressure-rated equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Ideal for use in commercial and residential hydronic heating boilers, hot water supply tanks, and closed-loop liquid systems requiring reliable ASME-rated pressure protection.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43127328407646,"sku":"181905LF","price":324.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/181905LF_image_8a351596-e376-4ca3-b8e4-1c01d403db1c.png?v=1786050432","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-181905lf-250-3-4-60-pressure-relief-valve","provider":"National Boiler Supply","version":"1.0","type":"link"}