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These valves are used for ASME Section IV, HV low pressure hot water boilers for liquid/steam service. Working well in steam generator, hot water boiler or heat exchanger applications. The Series 537 valve is set to the pressure listed in the item title. Each valve is tested and inspected for pressure setting and leakage This is a long service life valve due to the extra heavy body Top Guided disc assembly includes a resilient seal in the seating area Includes a heavy duty lift lever The pivot between the sping and disc aides in the correction for misalingment. Spring side thrust compensation with pivot", "features": [ "The Kunkle Model 537, Pressure Relief Valve, is excellent for relieving overpressure created by thermal expansion under normal firing conditions in low pressure hot water boilers. Also works well in applications where overpressure in the form of water or steam has been created in over-firing by a failure in the control system. 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