Low-noise valve trim
First Claim
Patent Images
1. A valve trim comprising:
- a wall having a plurality of adjacent passages arranged in said wall and passing therethrough for providing a flow path through the valve; and
noise reducing means for directing the fluid flow leaving each said passage according to the position of said passage in said wall and creating a flow field in the fluid, said flow field including a plurality of adjacent vortices with axes substantially normal to said wall and spaced from each other, each said vortex rotating in the opposite direction from an adjacent vortex;
wherein said passages extend through said wall at predetermined penetration angles for directing the fluid flow leaving said passages so that adjacent passages cooperate to form said noise-reducing means and create said flow field and each said passage directs the flow for two adjacent vortices.
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Accused Products
Abstract
A cylindrical valve trim has holes in the valve trim wall that provide a fluid flow path through the valve. The holes pass through the wall at predetermined angles to create a plurality of counter-rotating vortices with parallel axes normal to the wall.
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Citations
13 Claims
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1. A valve trim comprising:
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a wall having a plurality of adjacent passages arranged in said wall and passing therethrough for providing a flow path through the valve; and noise reducing means for directing the fluid flow leaving each said passage according to the position of said passage in said wall and creating a flow field in the fluid, said flow field including a plurality of adjacent vortices with axes substantially normal to said wall and spaced from each other, each said vortex rotating in the opposite direction from an adjacent vortex; wherein said passages extend through said wall at predetermined penetration angles for directing the fluid flow leaving said passages so that adjacent passages cooperate to form said noise-reducing means and create said flow field and each said passage directs the flow for two adjacent vortices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A valve comprising:
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a valve body including a valve chamber with an opening and a partition having an aperture therein; a bonnet closing said opening in said valve chamber; a hollow cylindrical trim held in place in said valve chamber between said partition and said bonnet and having a plurality of adjacent passages arranged in the wall thereof for defining, with said aperture in said partition, a flow path through the valve, wherein said passages extend through the wall of said cylinder at predetermined penetration angles and comprise noise-reducing means for directing the fluid flow-leaving each said passage according to the position of said passage in said wall and creating a flow field in the fluid, said flow field including a plurality of adjacent vortices with axes normal to the wall of said cylinder and spaced from each other, each said vortex rotating in the opposite direction from an adjacent vortex; a valve stem mounted in and for movement relative to said bonnet; and a valve plug guided by said trim for movement axially thereof upon movement of said valve steam for selectively opening and closing said passages to control the fluid flow through said valve; wherein said passages are arranged in columns extending axially and in an endlessly repeating pattern extending circumferentially of said cylinder and in a circumferentially extending central zone disposed between two peripheral zones spaced apart axially of said cylinder, a first number of said passages are disposed in said central zone and have a shape for causing the fluid passing therethrough to produce a first acoustic frequency, a second number of passages are disposed in said peripheral zones and have a shape for causing the fluid passing therethrough to produce a second acoustic frequency higher than said first acoustic frequency, and each said passage directs the flow for two adjacent vortices. - View Dependent Claims (12, 13)
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Specification