Mueller Industries A17942 Check Valve

Q: What is the minimum pressure required to open this valve?

The Mueller Industries 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.

Q: 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.

Q: 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.

Mueller Industries

$1,038.00

The Mueller Industries 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.

Key Benefits:

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.

Common Questions:

What is the minimum pressure required to open this valve?
The Mueller Industries 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.