Self-aligning gate valve
First Claim
1. A mounting system for connecting a gate to a stem in a gate valve, comprising:
- a unitary gate, reciprocally movable in a plane of movement between an open and closed position;
support means for said gate acting between said gate and the stem, said support means being loosely fitted to said gate and adapted for a threaded connection with radial thread clearance to the stem to facilitate movement of said gate transversely to said plane of movement in response to differential pressure applied to said gate upon movement of said gate in said plane toward said closed position.
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Accused Products
Abstract
A gate valve provides an efficient and effective seal from high pressures to pressure differentials below 50 psi through a self-aligning gate of reduced mass (semi-gate). The invention provides a transmission between the gate and stem which permits its sealing surface to remain normal to the relative surface of the seat irrespective of pressure, circulation rate, or flow medium (gas or liquid). This is accomplished through the full floating nut element which, when loosely engaged to the stem and inserted into an oversized slot at the upper end of the semi-gate, allows the gate to move axially in the direction of flow without interfering with the vertical movement of the gate by the stem. This feature is accomplished by introducing a clearance between the stem and nut. The gate is of reduced mass to allow a more instantaneous response to pressure transients because of its lighter weight and reduced profile. By eliminating substantially the lower 50 percent of the gate'"'"'s flow port, a large reduction of gate mass is achieved, allowing further mass and size reductions to the gate housing.
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Citations
10 Claims
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1. A mounting system for connecting a gate to a stem in a gate valve, comprising:
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a unitary gate, reciprocally movable in a plane of movement between an open and closed position; support means for said gate acting between said gate and the stem, said support means being loosely fitted to said gate and adapted for a threaded connection with radial thread clearance to the stem to facilitate movement of said gate transversely to said plane of movement in response to differential pressure applied to said gate upon movement of said gate in said plane toward said closed position. - View Dependent Claims (2, 3, 4, 5)
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6. A gate valve comprising:
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a body; a stem acting within said body; a unitary gate reciprocally movable in a plane of movement between an open and closed position; support means for said gate acting between said gate and said stem, said support means being loosely fitted to said gate and adapted for a threaded connection with radial thread clearance to said stem to facilitate movement of said gate transversely to said plane of movement in response to differential pressure applied to said gate upon movement of said gate in said plane toward said closed position. - View Dependent Claims (7, 8, 9, 10)
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Specification
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- Resources
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Current AssigneeBaker Hughes Incorporated (Baker Hughes Company)
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Original AssigneeBaker Hughes Incorporated (Baker Hughes Company)
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InventorsBailey, Stuart L.
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Primary Examiner(s)Fox, John C.
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Application NumberUS07/664,872Time in Patent Office644 DaysField of Search251/84, 251/175, 251/195, 251/326, 251/193, 251/327US Class Current251/327CPC Class CodesF16K 3/314 Forms or constructions of s...
