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Valve trim apparatus for use with valves

A technology of valve cage and valve seat, which is applied in the field of valve trim device, which can solve problems such as leakage and seal assisting pressure application

Active Publication Date: 2015-03-04
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in low pressure applications, the fluid pressure is insufficient to properly assist in pressurizing the seal against the sealing surface, thereby causing unwanted leakage through the valve

Method used

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  • Valve trim apparatus for use with valves
  • Valve trim apparatus for use with valves
  • Valve trim apparatus for use with valves

Examples

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Embodiment Construction

[0015] The example valve trim devices or assemblies described herein may be used with valves having a sliding valve stem, such as, for example, control valves, throttle valves, and the like. In general, the example valve trim assemblies described herein can be used to provide a seal to substantially prevent leakage between a valve sealing surface or cage and a closure member (eg, valve plug). In particular, the example valve trim devices described herein include a closure member having an enlarged sealing portion or seating surface (eg, a head having a diameter that is relatively larger than the diameter of the body portion of the closure member). An example valve trim apparatus may also include a cage having a first portion removably coupled to a second portion. In one example, the first and second cage portions may be secured to the seal assembly between the first and second cage portions such that the enlarged seal portion of the closure member engages the seal assembly whe...

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PUM

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Abstract

A valve trim apparatus for use with valves is described. An example valve trim apparatus includes a cage having an upper portion removably coupled to a lower portion. A closure member is disposed within the cage and has a first seating surface and a second seating surface. A seal assembly is fixed between the upper and lower portions of the cage. The first sealing surface of the closure member sealingly engages the seal assembly when the closure member is in a closed position to prevent leakage between the closure member and the cage.

Description

technical field [0001] The present invention relates generally to valves and, more particularly, to valve trim arrangements for valves. Background technique [0002] Valves are commonly used in process control systems to control the flow of process fluids. Sliding stem valves (such as gate valves, globe valves, diaphragm valves, pinch valves, etc.) typically have a closure member (eg, a valve plug) disposed in the fluid path. A valve stem operably couples the closure member to an actuator that moves the closure member between an open position and a closed position to allow or restrict the flow of fluid between the inlet and outlet of the valve. Additionally, to provide and / or achieve a certain fluid flow characteristic desired, valves typically employ a cage placed in the fluid path between the inlet and outlet of the valve. The cage can reduce flow capacity, attenuate noise, and / or reduce or eliminate cavitation. Additionally, a cage typically surrounds the closure membe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K47/08
CPCF16K47/08
Inventor B·W·贝尔L·E·弗勒明
Owner FISHER CONTROLS INT LLC