. Public works . chamber pressing on upper valveI, and lower valve J and pistonK. The pressure, also passingthrough G into chamber L, whileB holds D open, the water passeson to port N to the pressure atwhich B is set. The pressure stillincreasing, exerts a pressure underdiaphragm C, which moves up, com-pressing spring B and allowing Dto close. The main valves I and Jare forced to their seats by the initialpressure shutting off the water. Thepiston O and K prevent chatteringand acts as a cushion. The electricsolenoid which controls the auxiliaryvalve is wired up to the switchboardat the pumping
. Public works . chamber pressing on upper valveI, and lower valve J and pistonK. The pressure, also passingthrough G into chamber L, whileB holds D open, the water passeson to port N to the pressure atwhich B is set. The pressure stillincreasing, exerts a pressure underdiaphragm C, which moves up, com-pressing spring B and allowing Dto close. The main valves I and Jare forced to their seats by the initialpressure shutting off the water. Thepiston O and K prevent chatteringand acts as a cushion. The electricsolenoid which controls the auxiliaryvalve is wired up to the switchboardat the pumping station or fire depart-ment, and in case of fire the switch isthrown, causing the solenoid to openthe small auxiliary valve and exhaust the water pressure from above K,which allows the main valve to openinstantly to full area. These valvesare made in many designs and sizes. Both the pressure and altitude valvesare made, among many other types, bythe Golden-Anderson Specialty Co.,Fulton Building, Pittsburgh,
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
