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Valve trim

A valve body, ball valve technology, applied in the field of cavitation control and noise reduction valve trim

Pending Publication Date: 2022-05-13
FISHER CONTROLS INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of adjacent expansion chambers requires that the flow passages be spaced apart and restrict flow through the trim

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0040] The exemplary valve trims shown and described herein provide multi-stage cavitation control and noise reduction utilizing stacked or nested flow channels that provide maximum flow area through the valve trim. The valve trim has multiple flow channels, each flow channel has multiple converging nozzles and rapidly expanding pressure drop (expansion) chambers, and stacks multiple stages of pressure drop chambers in adjacent flow channels as efficiently as possible, This allows the flow area through the trim to be maximized, giving the trim a higher flow capacity while still attenuating noise and cavitation.

[0041] In the examples shown herein, in order to efficiently stack or nest the flow channels, each flow channel has an octagonal shape and converges into a pressure drop chamber with a throat of square cross-section. The number of converging and diverging stages in the trim can vary depending on the total pressure drop and flow required. The arrangement of octagonal ...

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Abstract

A valve trim includes a body having a plurality of parallel flow passages extending from a first end of the body to a second end of the body opposite the first end. Each flow channel includes a throat and an expansion chamber, and each throat is nested between the expansion chambers of directly adjacent flow channels.

Description

technical field [0001] The present disclosure relates generally to valve trim for control valves, and more particularly, to valve trim for cavitation control and noise reduction. Background technique [0002] In a typical control valve, cavitation and the noise and vibrations that result from the cavitation occur when a liquid flowing through the control valve experiences a high pressure drop. Cavitation occurs when a fluid evaporates and then returns to a liquid state, such as when fluid passes through a restriction, such as between a valve plug / disk and a valve seat. Due to the decrease in pressure and increase in velocity at the restriction, the fluid may reach its vaporization point. Cavitation can cause noise and vibration, which can damage the control valve. This phenomenon is especially prone to occur in ball valves and butterfly valves because they only experience pressure drop in one stage. [0003] In some control valves, valve trim has been used to regulate flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K47/08F16K5/06F16K1/22
CPCF16K47/08F16K5/0605F16K1/22F16K27/0218F16K27/067F16K47/00F16K47/045F16K1/32
Inventor J·D·雅布朗斯基
Owner FISHER CONTROLS INT LLC