Patent ID: 6913240

Claim:
A safety system for a flow line to selectively permit and prevent fluid flow therethrough, the system comprising: a safety valve disposed along the flow line and moveably actuatable between open and closed positions; a hydraulic actuator operably mounted to the safety valve to actuate the safety valve between the open and closed positions; and an electrohydraulic control unit operably coupled to the hydraulic actuator, the electrohydraulic control unit comprising a hydraulic fluid reservoir and a piston for selectively transferring hydraulic fluid between the hydraulic fluid reservoir and the hydraulic actuator via a coupling, the electrohydraulic control unit also comprising an electric motor having a selectively rotatable shaft and a converter configured to transform the rotational motion of the shaft to translational motion of the piston, thereby controlling the transfer of the hydraulic fluid from the hydraulic fluid reservoir to the hydraulic actuator.