Hydraulic actuated control valve

An electrically actuated flow control valve comprising:

• a valve body having a fluid inlet and at least one fluid outlet and a cylindrical bore therethrough;
• a gate member slidably received in said bore and adapted to selectably close or open said valve;
• an actuator housing having a bottom plate attached to said valve body, the bottom plate having an opening therein coaxial with said valve body cylindrical bore;
• a cylinder mounted in said housing, the cylinder providing a cylinder cavity closed at one end;
• a piston reciprocally positioned in said cylinder cavity;
• a piston rod affixed at one end thereof to said piston, the piston rod extending through said opening in said housing bottom plate, the other end of the piston rod being attached to said valve gate member;
• an electrically powered pump positioned within said housing, the pump having a fluid inlet and a fluid outlet, the fluid outlet being connected to said cylinder housing cavity between said closed end and said piston;
• a check valve in said fluid inlet permitting fluid to flow from said pump into said cylinder cavity but prohibiting fluid flow in the reverse direction;
• a closed, variable volume fluid sump container positioned within said housing adjacent said cylinder and said pump;
• a conduit communicating said sump container with said pump inlet;
• an electrically operated bypass valve having a fluid inlet and a fluid outlet;
• a conduit connecting said bypass valve fluid inlet to said cylinder cavity between said closed end and said piston;
• a conduit connecting said bypass valve fluid outlet to said sump container, said sump container, said conduits, said pump, said cylinder cavity between said piston and said closed end, and said valves forming a closed fluid containing system isolated from the interior of said housing;
• and
• switch means for selectably energizing said pump and said bypass valve to selectably position said piston, and said piston rod to thereby control the position of said valve gate member, said pump, cylinder and switch means being exterior of said sump container.