Apollo Valves 1-1/4" FNPT x 1-1/2" FNPT RVW61 5,535,000 BTU Bronze Relief Valve (75 psi)

High-capacity heating valves with female inlet, expanded or standard female outlet. Protects against excessive water pressure due to failure of controls to regulate BTU input. Elevated seat for drainage of water away from seat area. Entire pressure range is National Board capacity certified. Features ASME Section IV Certified Capacity Corrosion Resistant Construction Diaphragm Isolated Spring Chamber Extremely High Capacity Made in the USA Approvals ASME Section IV Heating Boilers Canadian Registration Number 0G8547.5C Pressure Equipment Directive 2014/68/EU (PED)