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Valve shaft apparatus for use with rotary valve

A valve body, fluid valve technology, applied in valve devices, lift valves, valve details, etc., can solve problems such as increasing manufacturing complexity and cost

Inactive Publication Date: 2015-07-22
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Split valves include body gaskets or body seals to provide sealing and thereby increase manufacturing complexity and cost

Method used

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  • Valve shaft apparatus for use with rotary valve
  • Valve shaft apparatus for use with rotary valve
  • Valve shaft apparatus for use with rotary valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The example valve shaft arrangements described herein may generally be used with any size, type, and / or geometry of rotary fluid valves to provide support to a closure member (eg, a valve disc) of the rotary fluid valve. The example valve shaft assembly described herein is particularly advantageous for hygienic applications because the valve shaft assembly significantly reduces the potential for bacterial growth and thus significantly reduces contamination of the process fluid. Additionally, the exemplary valve shaft assembly includes a seal leak indicator or detector (eg, a visual indicator) to provide an indication of process fluid leakage through the seal of the valve shaft assembly. Significantly faster detection of fluid leaks in sanitary applications reduces the likelihood of bacterial growth and thus contamination of the process fluid. Accordingly, the seal leak indicators described herein are advantageous for hygienic applications, whereby a seal failure can cau...

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PUM

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Abstract

An example valve shaft apparatus for use with a rotary valve disclosed herein includes a shaft (230) having a first portion (242) to be positioned in an opening of a valve body (204) and a second portion (244) to be positioned in a cavity (222) of a closure member (214). A first seal (250) is coupled to the first portion of the shaft to prevent fluid leakage into the opening of the valve body, where the first seal defines a first leakage detection area (258) adjacent the first seal. A second seal (252) is coupled to the second portion to prevent fluid leakage into the cavity of the closure member, where the first seal is spaced from the second seal and the second seal is to define a second leakage detection area (260) adjacent the second seal. A passageway (274) is formed in the shaft and fluidly coupled to the first and second leakage detection areas to provide an indication of fluid leakage past the first seal in the opening or to detect fluid leakage past the second seal in the cavity. The passageway is in fluid communication with a shaft outlet (276) formed in an end of the shaft, where the shaft outlet is positioned away from the first and second leakage detection areas.

Description

technical field [0001] The present disclosure relates generally to fluid valves and, more particularly, to valve shaft arrangements for rotary valves. Background technique [0002] Valves are commonly used in process control systems to control the flow of process fluids. Rotary valves (eg, butterfly valves) typically have a closure member (eg, a disc) disposed in the fluid path. A valve shaft operably couples the closure member to an actuator that rotates the closure member between an open position and a closed position to allow or restrict fluid flow between the inlet and outlet of the valve. When the closure member is in the closed position, the closure member sealingly engages a valve seat or sealing surface (eg, a sealing ring secured to the valve body) to restrict fluid flow through the valve. [0003] A follower shaft (which may be integrally formed with the valve shaft) is typically coupled to one end of the closure member opposite the end of the valve shaft to prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K41/02F16K37/00
CPCF16K41/046F16K1/224F16K37/0058F16K1/2268F16K1/226F16K1/225F16K1/2261F16K37/00
Inventor D·A·亚诺尔德D·G·哈尔姆
Owner FISHER CONTROLS INT LLC