Rotating bonded valve assembly
AssigneeNational Oilwell Varco, L.P.
InventorMark A. Staggs
Life of this patent
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Abstract
Apparatus and methods for constructing a valve assembly comprising an anti-friction ring. The anti-friction ring allows a closure member in the valve assembly to more freely rotate during operation of the valve assembly. Consequently, the closure member strikes a sealing member in different rotational positions during repetitive cycling of the valve assembly.
Claims20
A valve assembly for a pump used to pump abrasive fluid comprising:
- a biasing member;
- a closure member having a first coefficient of friction;
- a sealing member, wherein said biasing member biases said closure member towards said sealing member;
- and
- an anti-friction ring having a second coefficient of friction less than said first coefficient of friction between said closure member and said biasing member.
The valve assembly of claim t, wherein said biasing member is a spring and said closure member comprises a disc portion.
A valve assembly for a pump used to pump abrasive fluid comprising:
- a biasing member seat having a first coefficient of friction;
- a biasing member having a second coefficient of friction;
- a closure member;
- a sealing member, wherein said biasing member biases said closure member towards said sealing member;
- and
- an anti-friction ring between said biasing member seat and said biasing member, said anti-friction ring having a third coefficient that is less than said first coefficient of friction and less than said second coefficient of friction.
A valve assembly for a pump used to pump abrasive fluid comprising:
- a biasing member having a first coefficient of friction;
- a closure member;
- a sealing member, wherein said biasing member biases said closure member towards said sealing member and said closure member rotates relative to said sealing member;
- and
- an anti-friction ring disposed adjacent an end of said biasing member and having a second coefficient of friction less than said first coefficient of friction.
Dependencies are inferred from the claim text.