42S COMBO PUMP CONTROLLER & LWCO (STEAM) Apollo Relief Valves Series 551-S

Series 551-S

ASME Section IV capacity certified bronze safety relief valve for protection of hot water heating boilers

Model 792 - High Pressure Water Vent Valve For releasing air from hot or cold water or glycol mains

• Install 6-10" (150-250mm) above horizontal return and 8" (450mm) above the boiler water line

42S COMBO PUMP CONTROLLER & LWCO (STEAM) Apollo Relief Valves Series 551-SLow Water Cut Offs Combination Low Water Cut Off Pump Controllers for Steam Boilers Series 42S Low Water Cut Off Pump Controllers For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column For boilers of any steaming capacity Monel bellows provides corrosion resistance Single pole, single throw snap action switches Enclosed junction box protects switches Optional features Quick hook up fittings Gauge