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Locking actuator stem and rod end bearing apparatus for use with fluid valves

A rod end bearing and locking device technology, which is applied in the field of devices for locking actuator rods and rod end bearings, can solve the problems that the rod end bearing and the actuator rod are separated and cannot provide locking strength, etc.

Active Publication Date: 2012-05-23
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of locking compound does not provide sufficient locking strength, and may cause rod end bearings and actuation to become damaged even when a small amount of torque is applied during actuator disassembly (e.g., diaphragm cap screw removal). lever separation

Method used

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  • Locking actuator stem and rod end bearing apparatus for use with fluid valves
  • Locking actuator stem and rod end bearing apparatus for use with fluid valves
  • Locking actuator stem and rod end bearing apparatus for use with fluid valves

Examples

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Embodiment Construction

[0018] In general, the exemplary devices described herein prevent inadvertent disengagement of the connection between the rod end bearing of a control valve actuator and the actuator rod or shaft. In particular, the exemplary arrangement includes a rod end bearing and an actuator rod having (eg, integrally formed) anti-rotation or locking means for preventing the rod from rotating, eg, during maintenance or repair of the actuator. The end bearing and actuator rod are separated. For example, the rod end bearings and actuators described herein can be used even if a relatively high torque is applied to the fastener when the diaphragm plate is coupled to and / or uncoupled from the end of the actuator rod opposite the end coupled to the rod end bearing. The connection of the actuator rod can also prevent the disconnection of the connection. In contrast to many known devices, the anti-rotation or locking devices described herein do not require chemicals (eg, thread locking compounds...

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PUM

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Abstract

Actuator stem (204) and rod end bearings (210) having locking mechanisms are described. An example apparatus for use with a control valve actuator includes a rod end bearing having a bearing retainer and a shaft portion extending from the bearing retainer. The apparatus also includes an actuator stem having a first end to be operatively coupled to a diaphragm plate (108) of the control valve actuator and a second end to be coupled to the rod end bearing. A locking mechanism coupled to the actuator stem or the rod end bearing prevents the actuator stem and the rod end bearing from decoupling when the actuator stem is coupled or de-coupled to the diaphragm plate.

Description

technical field [0001] The present invention relates generally to valve actuators, and more particularly to means for locking actuator rods and rod end bearings for fluid valves. Background technique [0002] Automatic control valves, such as rotary control valves, are commonly used in process control plants or systems to control the flow of process fluids. Rotary control valves typically include an actuator (eg, pneumatic actuator, electrical actuator, hydraulic actuator, etc.) operatively coupled by a lever to a shaft extending from the rotary valve. This lever converts the linear displacement of the actuator rod into the rotational displacement of the valve shaft. Accordingly, rotation of the lever rotates the valve shaft and a fluid control element (eg, disc, ball, etc.) coupled to the valve shaft to increase or restrict fluid flow through the valve. [0003] To couple the lever to the actuator rod, rod end bearings are typically used. The rod end bearing may include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/165F16C7/02
CPCF16K31/1655F16B39/02F16C2361/91F16C7/02F16C2226/60Y10T403/556Y10T403/49F16K31/16
Inventor B·Q·莱格
Owner FISHER CONTROLS INT LLC