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Hydraulic actuating device for a sliding stem control valve assembly

A technology for controlling valves and sliding rods, applied in mechanical equipment, engine components, valve operating/release devices, etc., can solve the problems of manually operating valves, connectors that do not want to rotate, apply, etc.

Active Publication Date: 2013-11-20
EMERSON PROCESS MANAGEMENT TIANJIN VALVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these known override mechanisms only allow manual operation of some valves in one direction and therefore cannot be used to manually operate valves in the other direction
Due to size and material strength limitations, this known manual override mechanism is generally unable to exert more than about 2 tons of force on the valve stem
Additionally, such known manual override mechanisms (like the handwheel and screw) must convert rotational energy (from the handwheel) into linear energy on the valve stem
As a result, the valve stem or the connection between the valve stem and the actuator stem may be subjected to undesired rotational and / or shear forces

Method used

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  • Hydraulic actuating device for a sliding stem control valve assembly
  • Hydraulic actuating device for a sliding stem control valve assembly
  • Hydraulic actuating device for a sliding stem control valve assembly

Examples

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Embodiment Construction

[0016] Now refer to the drawings and specific reference figure 1 , Generally, the reference numeral 20 refers to the sliding stem valve assembly. The sliding stem valve assembly 20 includes a control valve 22 to which a valve actuator 24 is attached. The valve actuator 24 moves the actuator rod 25 in a reciprocating manner. The actuator rod 25 is in turn coupled to the control valve rod 27. Therefore, the control valve rod 27 moves in conjunction with the actuator rod 25 to control the flow of process fluid through the control valve 22, as described further below.

[0017] Reference now figure 2 , figure 2 It is shown in further detail that the control valve 22 includes a housing 26 having an inlet 28 and an outlet 30. Although not shown, it is understood that the control valve 22 is adapted to allow the process fluid to flow from the inlet 28 to the outlet 30, and it is understood that by adjusting the position of the valve plug 32 slidably disposed in the housing 26, the sa...

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PUM

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Abstract

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.

Description

Technical field [0001] The disclosure herein relates generally to an override or backup device for an actuator of a sliding rod control valve assembly, and more specifically to an override or backup device for a hydraulic actuator of a sliding rod control valve assembly And it relates to the control valve including the device. Background technique [0002] Many sliding rod control valve assemblies use well-known diaphragm type or piston type actuators commonly referred to as sliding rod valves for actuation with a control fluid (e.g., air). The sliding stem valve can also be actuated by using a portion of the process fluid flowing through the sliding stem valve or by using an electric motor actuator. Actuators can be used to automate these control valves by providing force and movement for opening or closing the valves. The sliding stem valve has a valve stem (for example, a sliding rod) that moves a flow control element (for example, a valve plug) between an open position and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K11/04F16K37/00
CPCF16K31/1262F16K37/0016F16K31/1221F16K31/1225F16K37/0041
Inventor 李楠楠高淳
Owner EMERSON PROCESS MANAGEMENT TIANJIN VALVES