US 5,297,777 AGranted

Instant on-off valve for high-pressure fluids

AssigneeJetec Company

InventorGene G. Yie

Life of this patent

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Abstract

A flow control valve for instant on-off operations with gases or liquids at relatively high pressures, such as pressures between 10,000 psi and 100,000 psi. The valve includes a valve body having two or more valve cavities in communication with each other and defined by two end seal assemblies and one or more valve port seal assemblies. An elongated, round, sliding valve stem is centrally located through the seal assemblies. End plugs are used to support the end seal assemblies. The valve stem has fluid passages which are preferably machined at a mid-section of the valve stem. The valve stem is slid parallel to its longitudinal axis to allow or prevent communication between the valve cavities by way of the fluid passage of the valve stem. Two opposite ends of the valve stem are either not exposed to the working fluid or are exposed to different pressures of the working fluid. With both opposite ends of the valve stem not being exposed to the working fluid, fluid-induced forces of relatively high magnitude are not exerted on the valve stem.

Claims21

Dependent claims

An on-off valve comprising:

a valve body having a fluid inlet, an upstream chamber, a downstream chamber, and a fluid outlet, in an open position of the on-off valve said fluid inlet, said upstream chamber, said downstream chamber and said fluid outlet in communication with each other;
a valve stem slidably mounted with respect to said valve body, said valve stem having an upstream portion and a downstream portion, said upstream portion having a reduced cross-sectional area portion forming at least one fluid passage in communication with said upstream chamber, in a closed position of the on-off valve communication being prevented between each said fluid passage and said downstream chamber;
central seal means for preventing communication between said upstream chamber and said downstream chamber about said downstream portion of said valve stem in said closed position, said central seal means comprising a rigid seal assembly sealably mounted between said upstream chamber and said downstream chamber, said rigid seal assembly having a seal assembly through hole, and said valve stem sealably mounted within said seal assembly through hole, an upstream bushing positioned within said upstream chamber, said upstream bushing having an upstream bushing through hole and a downstream bushing face abutting an upstream seal face of said rigid seal assembly, said upstream portion of said valve stem positioned within said upstream bushing through hole, a rigid entry ring mounted between and contacting said rigid seal assembly and said upstream bushing, a downstream bushing positioned within said downstream chamber, said downstream bushing having a downstream bushing through hole and an upstream bushing face abutting a downstream seal face of said rigid seal assembly, said downstream portion of said valve stem positioned within said downstream bushing through hole, a rigid exit ring mounted between and contacting said rigid seal assembly and said downstream bushing;
end seal means for sealing said upstream chamber about said upstream portion of said valve stem and for sealing said downstream chamber about said downstream portion of said valve stem;
positioning means for urging said valve stem into one of a normally-open position and a normally-closed position;
and
displacement means for moving said valve stem between said closed position and said open position.

4 more elements

An on-off valve comprising:

a valve body having a fluid inlet, an upstream chamber, a downstream chamber, and a fluid outlet, in an open position of the on-off valve said fluid inlet, said upstream chamber, said downstream chamber and said fluid outlet in communication with each other;
a valve stem slidably mounted with respect to said valve body, said valve stem having an upstream portion and a downstream portion, said upstream portion having a reduced cross-sectional area portion forming at least one fluid passage in communication with said upstream chamber, in a closed position of the on-off valve communication being prevented between each said fluid passage and said downstream chamber;
central seal means for preventing communication between said upstream chamber and said downstream chamber about said downstream portion of said valve stem in said closed position, said central seal means comprising a rigid seal assembly sealably mounted between said upstream chamber and said downstream chamber, said rigid seal assembly having a seal assembly through hole, and said valve stem sealably mounted within said seal assembly through hole, an upstream bushing positioned within said upstream chamber, said upstream bushing having an upstream bushing through hole and a downstream bushing face abutting an upstream seal face of said rigid seal assembly, said upstream portion of said valve stem positioned within said upstream bushing through hole, a rigid entry ring mounted between and contacting said rigid seal assembly and said upstream bushing, a rigid exit ring mounted between and contacting said rigid seal assembly and an inner shoulder of said valve body;
end seal means for sealing said upstream chamber about said upstream portion of said valve stem and for sealing said downstream chamber about said downstream portion of said valve stem;
positioning means for urging said valve stem into one of a normally-open position and a normally-closed position;
and
displacement means for moving said valve stem between said closed position and said open position.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/022,123Filed 25 Feb 1993 · continuation in part
Priority: 20 Dec 1990
Granted: 29 Mar 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B24C 5/02
Devices or accessories for generating abrasive blasts: blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
B05B 1/3046
The controlling element being a lift valve: the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve…
B24C 1/045
For treating only selected parts of a surface, e.g. for carving stone or glass: for cutting
F16K 3/24
With sealing faces shaped as surfaces of solids of revolution: with cylindrical valve members

Family

Serial630,560Parent of this continuation-in-part · filed 20 Dec 1990
Serial701,534Parent of this continuation-in-part · filed 16 May 1991
Serial794,581Parent of this continuation-in-part · filed 19 Nov 1991
Serial871,895Parent of this continuation-in-part · filed 21 Apr 1992
Serial891,568Parent of this continuation-in-part · filed 29 May 1992
US 5,241,986 AParent of this continuation-in-part
US 5,117,872 AParent of this continuation-in-part
US 5,186,393 AParent of this continuation-in-part
US 5,092,362 AParent of this continuation-in-part
US 5,297,777 AThis patent

From the US filing history. Foreign family members aren’t listed.