초록 ▼

A hydraulically operated actuator for a sliding gate valve designed for use in a subsea environment. The actuator includes a manual override system that functions independently of the actuator\s hydraulic piston and return spring, an externally accessible valve gate drift adjustment, an externally a

A hydraulically operated actuator for a sliding gate valve designed for use in a subsea environment. The actuator includes a manual override system that functions independently of the actuator\s hydraulic piston and return spring, an externally accessible valve gate drift adjustment, an externally adjustable upstop for the actuator stem, a stem thread assembly that can be manufactured from a material different from the actuator stem to prevent or reduce the possibility of thread galling, a hydraulic control pressure porting system integral with the hydraulic cylinder to minimize space requirements, and a facility for accommodating an optional external electrical stem position indicator package.

대표청구항 ▼

A fluid powered actuator for a sliding gate valve comprising a valve body with a flow passage therethrough, a bonnet connected to said body, a valve gate in said body, said valve gate having a flow passage therethrough, and a valve stem connected to said gate and extending through said bonnet, said

A fluid powered actuator for a sliding gate valve comprising a valve body with a flow passage therethrough, a bonnet connected to said body, a valve gate in said body, said valve gate having a flow passage therethrough, and a valve stem connected to said gate and extending through said bonnet, said actuator comprising: (a) a housing with first and second opposed closed ends; (b) a fluid cylinder within said housing and having an end portion; (c) a fluid-powered piston arranged to reciprocate within said cylinder for actuating said valve; (d) an actuator stem connected to said piston and extending through both of said opposed ends, said actuator stem comprising a first stem element extending from said piston through said first opposed housing end and terminating in a means for releasably connecting said actuator stem to said valve stem, a second stem element extending from said piston through said cylinder end portion and said second opposed housing end and terminating in a means for rotating said second stem element with respect to said first stem element, stop means on said second stem element cooperating with said second opposed housing end to limit axial movement of said second stem element, and threaded means adjustably interconnecting said first and second stem elements in and end-to-end manner, said threaded means comprising an externally threaded annular spacer releasably secured to one end of said first stem element and an internally threaded bore in said second stem element, said spacer and said bore cooperating to cause relative axial movement between said first and second stem elements when said second stem element is rotated with respect to said first stem element; (e) means on said valve stem for cooperating with said releasably connecting means on said actuator stem for releasably connecting and disconnecting said actuator stem to said valve stem while the valve is under operating pressure; and (f) means for connecting and disconnecting said housing to and from said valve bonnet while the valve is under operating pressure and for adjusting the position of the valve gate flow passage relative to the valve body flow passage, said connecting and disconnecting means comprising an annular flange body and a sleeve-like collar, said collar connected to the housing by first thread means and connected to said flange body by second thread means, said first and second thread means constituting a differential thread system so that rotation of said collar with respect to said housing and said flange body will change (1) the axial spacing between the housing and the flange body and (2) the position of the valve gate with respect to the valve body and the bonnet.