Hydraulically actuated tool and valve assembly therefor

摘要

A shuttle valve assembly (200) for an hydraulically actuated tool has a primary chamber (201) with a primary inlet port (202) located at an upstream end thereof for communicating with an hydraulic fluid supply (81). The primary inlet port (202) defines an inlet valve seat (203) with an inlet stop (204) located downstream. An inlet valve member (210) is displaceable along an inlet valve path between a closed position sealingly engaging the inlet valve seat (203) to at least substantially prevent flow of hydraulic fluid through the primary inlet port (202) and an open position engaging the inlet stop (204) and allowing flow. A primary outlet port (212) is located at a downstream end of the primary chamber (201) for communicating the primary chamber with an actuable member (52) of the tool. The primary outlet port (212) defines an outlet valve seat (213) with an outlet stop (224) located downstream. An outlet valve member (230) is displaceable along an outlet valve path between a closed position sealingly engaging the outlet valve seat (213) to at least substantially prevent flow of hydraulic fluid through the primary outlet port (212) and an open position engaging the outlet stop (224) and allowing flow. A charging port (214) is located between the primary inlet port (202) and the primary outlet port (212) for communicating the primary chamber (201) with an hydraulic pump (300). An hydraulic tool incorporating the shuttle valve assembly (200) is also disclosed.