Mueller A17942 Check Valve

The Mueller A17942 Magnetic Check Valve is a professional-grade solution for preventing reverse flow in high-capacity commercial refrigeration and air conditioning systems. Engineered with a 1-5/8" ODS solder connection, this CHECKMASTER series valve utilizes a hermetically formed solid copper body to eliminate potential leak paths. Unlike standard spring-loaded valves, the A17942 uses magnetic technology to provide a near-zero leak rate and superior pulsation dampening. It features a built-in 30-mesh stainless steel screen to protect internal components from debris, ensuring long-term reliability in the field. With a Maximum Working Pressure (MWP) of 800 psi and an operating temperature range of -40°F to 300°F, this valve is fully compatible with HFC, HCFC, and CFC refrigerants, including high-pressure R-410A. The DuraForm technology used in its construction allows for high-temperature brazing without damaging internal seats, offering maximum durability for demanding HVACR applications.

• Magnetic Closure System: Provides a more reliable seal than traditional springs, reducing pressure drop while maintaining a positive isolation.
• High-Flow Design: Boasts a Cv value of 27.8, minimizing energy loss and maximizing system efficiency in large-scale suction or liquid lines.
• DuraForm Construction: Eliminates internal braze materials, allowing the valve to withstand installation heat and maintain hermetic integrity.
• Versatile Mounting: Designed for flexible installation in either vertical or horizontal positions without compromising performance.
• Internal Protection: Integrated stainless steel strainer prevents contaminants from fouling the seat, reducing emergency service calls.

What is the minimum pressure required to open this valve?
The Mueller A17942 is designed for low-pressure differential operation, typically requiring less than 1 psi to initiate flow, making it ideal for systems where head pressure must be conserved.

Can this valve be used with R-410A systems?
Yes, its 800 psi pressure rating and UL recognition make it suitable for high-pressure R410A applications and modern HFO blends.

Do I need to disassemble the valve before brazing?
While DuraForm technology provides high heat resistance, it is standard practice for HVAC technicians to wet-wrap the body and use a nitrogen purge to protect the EPDM seats and internal alignment during the soldering process.

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Disclaimer: 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.