Kunkle Valve 0537-G01-HM0125 Relief Valve

The Kunkle Valve 0537-G01-HM0125 is a high-capacity ASME Section IV relief valve designed specifically for low-pressure steam and hot water boiler applications. Featuring a 1-1/2" Female NPT inlet and a 2" Female NPT outlet, this bronze safety relief valve is factory-set at 125 PSI with a rated discharge capacity of 11,163 lb/h (11,163,323 BTU/h). Engineered for demanding contractor environments, it utilizes an extra-heavy construction with a B584 alloy 8440 seat and a stainless steel spring to maintain set-point integrity under repeat cycles. The top-guided disc assembly includes a resilient EPDM insert and NBR O-ring to ensure positive shut-off, while the integrated isolating diaphragm prevents discharged media from corroding critical internal components. This boiler pressure relief valve also features a heavy-duty lift lever for manual testing and a National Board certified "HV" stamp, making it a reliable choice for protecting heat exchangers and steam generators from over-firing or thermal expansion.

• Dual-Purpose Protection: Effectively manages overpressure from both thermal expansion and control failure (over-firing).
• Enhanced Durability: The heavy-duty bronze body and SST spring material resist mineral scaling and atmospheric corrosion.
• Precise Alignment: A specialized pivot between the disc and spring compensates for side thrust, preventing premature wear and leakage.
• High Flow Capacity: Rated at over 11 million BTU/h to meet the safety requirements of large-scale commercial boiler systems.
• Field-Proven Reliability: Each unit is 100% factory tested for leakage and set-pressure accuracy before shipment.

What is the maximum temperature rating for the Kunkle 537 series?
This valve is rated for a temperature range of -20° to 250°F, making it suitable for standard hot water and low-pressure steam services.

Can this relief valve be mounted horizontally?
No. To satisfy ASME code and ensure proper drainage of the seat area, the valve must be installed in a vertical, upright position.

How do I verify the capacity for my specific boiler?
Ensure the valve's 11,163 lb/h steam capacity exceeds the gross BTU output of your boiler to comply with local safety codes and National Board requirements.

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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.