Reduced icing air valve

Details Reduced icing air valve Reduced icing air valve

F - Mech Eng,Light,Heat,Weapons

04

D

F04D 29/00 (2006.01) F04B 43/073 (2006.01)

Patent

CA 2160498

A reduced icing air valve for an air motor or a reciprocating double diaphragm pump is described. A shiftable valve having a pilot piston for shifting the valve for alternatively supplying compressed air through first and second supply ports to opposed first and second power pistons in opposed air motor chambers or first and second opposed diaphragm actuating chambers, respectively, and for effecting alternating exhaust of the chambers. The shiftable valve is further provided with a bypass independent of and intermediate the shiftable valve and each of the first and second air motor chambers or first and second diaphragm actuating chambers for bypassing the shiftable valve by exhaust air from the air motor chambers or diaphragm actuating chambers. The bypass means is furthest actuated in an opposing direction by a source of supply air to the chambers.

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