Patent ID: 6651574
Filing Date: 2003-11-25
Classification: B63H,F15B

Abstract:
A combination actuator and spool valve, the actuator being a fluid actuator and having an actuator housing with an internal bore and an outer portion which forms a spool for the spool valve, and a piston reciprocatingly received in the bore, the spool valve having a valve housing which is generally concentric with the actuator housing and extends about the actuator housing, the valve housing having an elongated bore with a longitudinal axis, the spool being reciprocatingly mounted within the elongated bore for relative movement of the value housing along the spool parallel to the axis, the valve housing having a housing passageway and the spool having a spool passageway, the passageways aligning in at least one axial position of the spool along the eloganted bore, whereby fluids can pass between the spool and the valve housing, the passageway of one of the spool or the valve housing including a first groove which extends parallel to the axis, but not completely, circumferentially about said one of the spool or the valve housing, the passageway of another of the spool or the valve housing including a second groove which extends circumferentially about said another of the spool or the valve housing.