{"product_id":"mueller-industries-a17940-check-valve","title":"Mueller Industries A17940 Check Valve","description":"\u003cp\u003eFor field technicians and mechanical contractors, the \u003cspan\u003e\u003cstrong\u003eMueller Industries\u003c\/strong\u003e \u003c\/span\u003e\u003cstrong\u003eA17940\u003c\/strong\u003e stands as a heavy-duty \u003cstrong\u003e1 1\/8 magnetic check valve\u003c\/strong\u003e engineered to eliminate backflow in critical refrigeration and air conditioning circuits. Part of the \u003cspan\u003e\u003cstrong\u003eMueller Industries \u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003eCHECKMASTER\u003c\/strong\u003e series, this valve utilizes \u003cstrong\u003eDuraForm technology\u003c\/strong\u003e to secure internal components without the use of braze materials. This manufacturing process prevents the overheating and warping often associated with traditional assembly, ensuring the \u003cstrong\u003ehermetically formed solid copper body\u003c\/strong\u003e maintains a zero-leak profile. With a \u003cstrong\u003emaximum operating pressure (MAP) of 800 psig\u003c\/strong\u003e and a temperature rating from \u003cstrong\u003e-40°F to 300°F\u003c\/strong\u003e, it is fully \u003cstrong\u003ecompatible with CFC, HCFC, and HFC refrigerants\u003c\/strong\u003e, including high-pressure R-410A systems. The magnetic lift mechanism replaces standard springs to provide near-zero \u003cstrong\u003einternal leakage\u003c\/strong\u003e and a low \u003cstrong\u003epressure drop\u003c\/strong\u003e, while the integrated \u003cstrong\u003e30 mesh stainless steel screen\u003c\/strong\u003e protects the seating surface from systemic debris.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Benefits for HVACR Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuraForm technology\u003c\/strong\u003e eliminates internal braze material for superior structural integrity during high-heat installation.\u003c\/li\u003e\n\u003cli\u003eFeatures a \u003cstrong\u003e1 1\/8 ODS solder connection\u003c\/strong\u003e with mechanically formed stops for fast, precise fit-up.\u003c\/li\u003e\n\u003cli\u003eHigh-capacity \u003cstrong\u003e800 PSI rating\u003c\/strong\u003e makes it suitable for liquid, suction, or hot gas defrost lines.\u003c\/li\u003e\n\u003cli\u003eEquipped with a \u003cstrong\u003ebuilt-in 30 mesh screen\u003c\/strong\u003e to keep the magnetic seat clear of contaminants.\u003c\/li\u003e\n\u003cli\u003eFlexible installation allows for \u003cstrong\u003evertical or horizontal\u003c\/strong\u003e mounting to fit tight mechanical room footprints.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Technician Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan this be used on the discharge line of a rack system?\u003c\/strong\u003e Yes, the \u003cstrong\u003eA17940\u003c\/strong\u003e is specifically designed for \u003cstrong\u003ecommercial refrigeration\u003c\/strong\u003e discharge and liquid lines where positive isolation is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat is the cracking pressure?\u003c\/strong\u003e This magnetic valve is engineered for a \u003cstrong\u003elow pressure differential to open\u003c\/strong\u003e (typically less than 1 psi), maximizing flow efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIs it compatible with POE oils?\u003c\/strong\u003e Yes, it is fully \u003cstrong\u003ecompatible with Mineral, Naphthenic, and POE oils\u003c\/strong\u003e used in modern HFC systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Mueller Industries","offers":[{"title":"Default Title","offer_id":1671332233241,"sku":"A17940","price":439.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Image_9bb0bdb8-170a-4259-9603-64f3210e74a0.png?v=1792453212","url":"https:\/\/www.gsistore.com\/products\/mueller-industries-a17940-check-valve","provider":"GSIstore","version":"1.0","type":"link"}