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45" WC pressure switch to ensure the system operates within the manufacturer's specified safety parameters
technically identical to the Sporlan E3S130
always verify the motor shaft diameter
preventing the gummy buildup that often causes nuisance boiler shutdowns
When should this relief valve be replaced
Watts 0383020 Valve Els PW 17895 45" WC pressure switch toThe Watts 0383020 (Model 740) is a high capacity ASME Section IV water pressure relief valve specifically engineered for large scale hot water space heating boilers. This 1 1 4 inch NPT iron body valve is designed to provide emergency overpressure protection, featuring a 30 PSI relief setting and a significant steam discharge capacity of 2,105,000 BTU hr. Its robust construction utilizes non metallic disc to metal seating to prevent sticking and