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A hydraulic actuating device for a sliding stem control valve assembly is mounted between a control valve and an actuator housing. The hydraulic actuating device is connected to one of a control valve stem, an actuator stem, and a stem connector and the hydraulic actuating device moves either the co

A hydraulic actuating device for a sliding stem control valve assembly is mounted between a control valve and an actuator housing. The hydraulic actuating device is connected to one of a control valve stem, an actuator stem, and a stem connector and the hydraulic actuating device moves either the control valve stem, the actuator stem, or the stem connector in response to varying hydraulic pressure within the hydraulic actuating device. The hydraulic actuating device may be used to override an actuator of the sliding stem valve during emergency operations, or to provide a backup actuator in the case of a primary actuator malfunction.

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1. A sliding stem valve assembly comprising: a control valve having a fluid inlet and a fluid outlet, the control valve comprising a valve plug that is movably positioned between the fluid inlet and the fluid outlet to control fluid flow through the control valve, the valve plug being connected to a

1. A sliding stem valve assembly comprising: a control valve having a fluid inlet and a fluid outlet, the control valve comprising a valve plug that is movably positioned between the fluid inlet and the fluid outlet to control fluid flow through the control valve, the valve plug being connected to a control valve stem;an actuator for moving the valve plug, the actuator comprising an actuator housing and a diaphragm mounted within the actuator housing, the diaphragm dividing the actuator housing into at least two chambers, an actuator stem being operatively coupled to the diaphragm at one end and moving in a reciprocating manner in response to movement of the diaphragm, the actuator stem being connected to the control valve stem at another end; anda hydraulic sleeve mounted between the control valve and the actuator housing, the hydraulic sleeve being connected to one of the control valve stem and the actuator stem, the hydraulic sleeve moving either the control valve stem or the actuator stem in response to varying hydraulic pressure within the hydraulic sleeve,wherein the hydraulic sleeve includes a sleeve housing and a hydraulic piston, the sleeve housing having an interior volume defined between a longitudinal inner surface of an outer wall and a longitudinal outer surface of an inner wall, the control valve stem being slidably disposed within a longitudinal opening defined by a longitudinal inner surface of the inner wall,wherein an inner surface of the hydraulic piston is adjacent to the outer surface of the inner wall of the sleeve housing, and wherein a first end of the hydraulic piston is slidably disposed within the interior volume of the sleeve housing and a second end of the hydraulic piston is slidably disposed outside of the interior volume of the sleeve housing;wherein the hydraulic piston is an elongated hollow cylinder having a flange portion at the first end, the flange portion sealingly engaging the inner surface of the outer wall to divide the interior volume into a low pressure chamber and a high pressure chamber, wherein pressure changes in the low pressure chamber and the high pressure chamber cause the hydraulic piston to displace within the sleeve housing. 2. The valve of claim 1 further comprising a yoke disposed between the actuator and the control valve, the hydraulic sleeve being mounted within the yoke. 3. The valve of claim 1, wherein the inner wall and the outer wall of the hydraulic sleeve are each cylindrical in shape, and wherein the hydraulic piston is an elongated hollow cylinder. 4. The valve of claim 1 further comprising a position indicator attached to one of the actuator stem and the control valve stem. 5. The valve of claim 4, wherein the hydraulic sleeve is attached to the position indicator. 6. The valve of claim 4, wherein the hydraulic sleeve is positioned between the control valve and the position indicator. 7. The valve of claim 4, wherein the hydraulic sleeve is positioned between the position indicator and the actuator. 8. The valve of claim 1, wherein the hydraulic sleeve operates to open the control valve. 9. The valve of claim 1, wherein the hydraulic sleeve operates to close the control valve. 10. The valve of claim 1, wherein the hydraulic sleeve overrides the actuator. 11. The valve of claim 1, wherein the hydraulic sleeve has a cross-sectional shape comprising one of circular, triangular, square, rectangular, or polygonal. 12. The valve of claim 1, wherein the sleeve housing has a first end and a longitudinally opposite second end, and wherein in a first position, the first end of the hydraulic piston is adjacent to the first end of the sleeve housing and in a second position, the first end of the hydraulic piston is adjacent to the second end of the sleeve housing.