ASME Specified|MIL-V-18634B Type I Class 3A Style B

• Water seal of high temperature resisting material isolates spring working parts from water during relief Iron body with expanded outlets for hot water space heating boilers Non-mechanical seat to disc alignment will not stick or freeze Water can not be trapped and sediment can not foul seat

This 2 in boiler pressure relief valve is used in hot water space heating boiler applications to protect against excessive pressure on all-types of hot water space heating boiler equipment. It consists of an iron body construction with expanded outlet drain connections for hot water space heating boilers, non-metallic disc to metal seating, stainless steel spring and test lever. Series 740 offers large discharge capacity, resists corrosive water conditions, resists sticking and freezing and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 60 psi ( 413.7 kPa) with corresponding high pressure ratings up to 8,883,000 Btu/hr.