REDUCED ICING VALVES AND GAS-DRIVEN MOTOR AND DIAPHRAGM PUMPINCORPORATING SAME

摘要

A reduced icing valve for an gas-driven motor and a reciprocating double diaphragm pump is provided having a shiftable valve for alternatively supplying a moti ve gas through first and second supply ports to opposed first and second power pistons in opposed motive gas chambers, respectively, and for effecting alternating exhaust of the chamber s. The shiftable valve is provided with an insert that deflects, away from the shiftable valv e, air entering from each of the bypass valves until the bypass valves are fully actuated by the exhaust gas from the motive gas chambers. The shiftable valve is further provided with bypass valves independent of and intermediate the shiftable valve and each of the first and second motive gas chambers for bypassing the shiftable valve by exhaust gas from the motive gas chambers. T he bypass valves are further actuated in an opposing direction by a supply source of motive g as to the chambers.