Patent ID: 7237470
Filing Date: 2007-07-03
Classification: F15B,Y10T

Abstract:
1. A fluid power unit comprising: an inlet and an outlet; a cylinder; a piston slidable in the cylinder, the piston dividing the cylinder into a retract side and an extend side; a two-position control valve; the control valve having a spool, a first pilot and a second pilot; the position of the spool responsive to the first and second pilots; a retract poppet valve in the retract side, and an extend poppet valve in the extend side; the retract and extend poppet valves being biased to a closed position; the retract poppet valve being in a fluid path between the retract side and the control valve; the extend poppet valve being in a fluid path between the extend side and the control valve; so that,