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Methods and apparatus to assemble actuators

A technology of biasing device and compression device, applied in the direction of valve operation/release device, valve device, engine element, etc., can solve the problems of small space length, complexity, increase the space packaging of the actuator, etc.

Active Publication Date: 2014-03-12
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some cases, including a biasing component may significantly increase the space package (eg, length) of the actuator.
In other cases, complex tooling or tooling may be required to include the biasing component if the cylinder of the actuator has a smaller spatial length than the biasing component

Method used

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  • Methods and apparatus to assemble actuators
  • Methods and apparatus to assemble actuators
  • Methods and apparatus to assemble actuators

Examples

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Embodiment Construction

[0014] Some known actuators (eg, spring-return actuators) provide a mechanical fail-safe return. For example, in order to provide a mechanical fail-safe reset, these known actuators use a spring which is arranged in the cylinder of the actuator and directly contacts the loading part of the actuator (eg a diaphragm or piston). The spring urges the loading member to one end of the stroke path (eg, a fully open position or a fully closed position) when the control fluid supply to the actuator is deactivated and / or removed.

[0015] To facilitate the assembly of actuators using spring-return devices, cylinders are often provided with a spatial profile (e.g., length or height) that accommodates a chamber located in the cylinder when the spring is in the released or uncompressed state ( For example, a spring completely within it). In this way, the spring does not exert a large force on the cover when the cover is connected to the cylinder.

[0016] However, in some applications (e...

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Abstract

Methods and apparatus to assemble actuators are described. An example method includes positioning a biasing element in a cavity defined by a housing of an actuator such that the biasing element is in an uncompressed state and at least a portion of the biasing element is to extend outside of the cavity beyond an end defined by the housing; compressing the biasing element to a compressed state until the portion of the biasing element extending outside of the cavity is positioned inside the cavity; coupling a cover to the end of the housing to capture the biasing element in the cavity; and maintaining the biasing element in the compressed state during the coupling such that the biasing element does not engage the cover.

Description

technical field [0001] This patent relates generally to actuators and, more particularly, to methods and apparatus for assembling actuators. Background technique [0002] Control valves are generally used in process control systems to control the flow of process fluids. Control valves typically include actuators (eg, pneumatic actuators, hydraulic actuators, etc.) operatively coupled to flow control components to automate the control valves. In operation, a control fluid (eg, air) is supplied to the actuator to position the flow control member relative to the valve seat to regulate fluid flow through the control valve. [0003] Many process control applications require that actuators (eg, valve actuators) include fail-safe systems. In an emergency, in a power failure, and / or if the control fluid (eg, air) supply to the actuator (eg, a pneumatic actuator) is disconnected, the fail-safe system operates by causing the actuator, and thus the The flow control components move t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/12
CPCF16K31/12F16K31/1221Y10T29/49863
Inventor D·M·亚当斯
Owner FISHER CONTROLS INT LLC
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