Patent ID: 7591133
Filing Date: 2009-09-22
Classification: F15B

Abstract:
1. A fail safe actuator system comprising a valve manifold block having a left side and a right side, said left side having left side openings, and said right side having right side openings; said manifold block having a front side having front side openings; said manifold block having a rear side having rear side openings; said manifold block having a top side having top side openings; and said manifold block having a bottom side having bottom side openings; fluid flow passageways within said manifold block connecting some of said left side openings with some of said right side openings; an accumulator connected in fluid flow connection to a right side opening; an actuator comprising a cylinder containing a moveable piston having an attached piston rod connected to a valve; said actuator cylinder connected in fluid flow connection to some of said left side openings; said fluid flow passageways within said manifold block connecting some of said front side openings with some of said rear side; an electrically operated pump motor and a motor driven pump connected in fluid flow connection to a fluid reservoir and connected in fluid flow connection to a solenoid operated control valve; said solenoid operated control valve connected in fluid flow connection to other of said openings; a manually operated hand pump connected in fluid flow connection to said reservoir and to a manual 4 way valve; said manual 4 way valve connected in fluid flow connection to another of said openings; and a set of pilot operated check valves connected in fluid flow connection to said fluid flow passageways between said motor driven pump and said hand pump; and a source of electrical power; whereby said actuator can be operated with said hand pump if electrical power is not available; and accumulator flow control valve ( hydraulic fluid forced from the bottom of the cylinder is slowed by said accumulator flow control valve (