Patent ID: 6722256
Filing Date: 2004-04-20
Classification: F04B

Abstract:
A reduced icing valve for a gas-driven motor comprising:a shiftable valve for alternatively supplying a motive 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 said chambers; said shiftable valve being further provided with bypass valves independent of and intermediate said shiftable valve and each of said first and second motive gas chambers for bypassing said shiftable valve by exhaust gas from said motive gas chambers, and an insert that deflects, away from said shiftable valve, air entering from each of said bypass valves until said bypass valves are fully actuated by said exhaust gas from said motive gas chambers; and said bypass valves being further actuated in an opposing direction by a supply source of motive gas to said chambers.