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Fail-safe apparatus for use with fluid valves

A technology for fluid valves and fluid chambers, applied in fluid pressure actuation devices, valve devices, valve operation/release devices, etc., which can solve problems such as cost occupation and increased complexity

Active Publication Date: 2013-07-03
TESCOM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such fail-safe systems add complexity, cost and take up additional space

Method used

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  • Fail-safe apparatus for use with fluid valves
  • Fail-safe apparatus for use with fluid valves
  • Fail-safe apparatus for use with fluid valves

Examples

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Embodiment Construction

[0013] Example valve devices or assemblies disclosed herein employ electronic flow controllers to precisely control fluid flow through the valve device. Additionally, the example valve arrangements disclosed herein include fail-safe features to provide a fail-safe condition when the electronic flow controller loses power. More particularly, an example fail-safe guard is integrated with the valve arrangement. Thus, unlike some known air-operated valve arrangements, the example valve arrangements disclosed herein do not require an auxiliary valve upstream of the valve arrangement to provide a fail-safe protection mechanism.

[0014] Example failsafe guards disclosed herein employ a connector or piston assembly having a first portion or piston that is movably or slidably coupled to a second portion or piston. Additionally, the piston assembly forms a chamber between the first and second parts of the piston assembly. A first portion of the piston assembly can be operatively coup...

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Abstract

Fail-safe apparatus for use with fluid valves are disclosed herein. An example fail-safe apparatus includes a first piston, a second piston movably coupled relative to the first piston, and a fluid chamber between the first and second pistons to receive a control fluid. The control fluid is to operatively couple the first and second pistons when the control fluid is provided in the fluid chamber. The first piston is operatively decoupled from the second piston when at least some of the control fluid is removed from the fluid chamber.

Description

technical field [0001] This patent relates generally to fluid valves and, more particularly, to fail-safe guards for fluid valves. Background technique [0002] Process control systems use various field devices to control and / or monitor process parameters. A field device, such as an air-operated on-off valve, applies a control fluid to move the flow control member relative to the orifice between an open position that allows fluid to flow through the valve and a closed position that restricts or prevents fluid flow through the valve. However, such air-operated on-off valves lack precise control of fluid flow through the valve. [0003] To precisely control fluid flow through the valve, the valve typically employs an electronic controller or actuator to actuate or move the flow control member relative to the orifice. However, during a fault condition (eg, when the power supply to the electronic controller fails), the electronic controller typically fails in (ie, remains in) ...

Claims

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Application Information

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IPC IPC(8): F16K31/122F16K31/02F16K1/00
CPCF16K31/1225F16K31/003F16K31/047F15B15/24F16K31/02F16K17/36F16K31/1221F16K31/124
Inventor E·J·伯吉特B·J·塔特
Owner TESCOM CORP