Fluid pressure powered apparatus

Details Fluid pressure powered apparatus Fluid pressure powered apparatus

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 7/02 (2006.01) F03C 1/08 (2006.01) F04B 43/073 (2006.01) F04B 53/10 (2006.01)

Patent

CA 2637715

A fluid pressure powered apparatus comprises a double-acting member, a first pilot valve, a second pilot valve, and a switchable valve is disclosed. The double-acting member is operable between a first stroke end and a second stroke end by fluid pressure from the switchable valve. The first and second pilot valves are configured to establish a biasing fluid pressure to first and second bias surfaces, respectively, of the switchable valve. The first and second pilot valves are actuatable by the double-acting member when at the first and second stroke ends, respectively, to reduce the biasing fluid pressure on the first bias surface. In operation, the reduction of biasing fluid pressure on either the first bias surface or the second bias surface, respectively, triggers the switchable valve to switch between a first stroke position and a second stroke position, respectively. A method of reciprocating a fluid pressure powered apparatus is also disclosed.

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