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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
The bimetal sensing element is tuned to open the electrical circuit at 150°F to prevent heat exchanger damage and close at 110°F once temperatures return to a safe operational threshold
the 310451 is compatible with high-performance McDonnell & Miller FS4-3 series
and 1611 pump models
ensuring the assembly maintains accurate valve plug placement despite line pressure fluctuations or flow surges
ensuring system pressures equalize before the next start cycle
Watts 0342691 Relief Valve The bimetal sensing element isThe Watts 0342691 (Model 335M2) is a high capacity boiler pressure relief valve engineered for hydronic heating systems and low pressure steam applications. Featuring a 3 4" female NPT inlet and 3 4" female NPT outlet, this ASME Section IV rated safety valve is factory set to 30 PSI, providing critical overpressure protection for residential and light commercial boilers. With a steam discharge capacity of 510,000 BTU hr, it serves as the direct
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