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The reinforced Buna-N diaphragm provides the necessary resilience against pressure fluctuations
making it the standard step-down solution for powering thermostats
Does this valve come with the orifice included
By utilizing this OEM-spec component
McDonnell & Miller 51-S-HD Water Feeder Els PW 17895 The reinforced Buna-N diaphragm providesThe McDonnell & Miller 51 S HD (Part Number 135800) is a heavy duty head mechanism only replacement designed specifically for Series 51 S mechanical water feeders. Engineered for high capacity systems up to 35,000 sq. ft., this unit is critical for maintaining precise water levels in low pressure steam and hot water boilers. Proportional feed action ensures a steady response to boiler demand, preventing the rapid cycling that stresses high volume
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