US4112969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable one piece liner for a gate valve
Assignee: NEW CONCEPTS Inc
•
Filing: 1976-11-22
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Granted: 1978-09-12
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Expires: 1996-11-22
Abstract
Abstract A replaceable one piece bore and chest liner is enclosed within a pair of mirror image castings to define a gate valve. A cast gate, enveloped within molded material, cooperates with the liner to open and close the gate valve.
Inventors
- 👤 Robert C. Still
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:41
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; F16K3/0281; F16K27/00; F16K27/04; F16K27/044; F16K3/0263; Y; Y10; Y10T; Y10T137/00; Y10T137/7504
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
In a gate valve having a positionable gate with opposing surfaces disposed therein for regulating the flow of fluid intermediate an attached pair of pipes, the improvement comprising a pliant liner molded in one piece for receiving, guiding and seating the gate, said liner including: a. a chest having a gate passageway with opposing sidewalls spaced from the opposing surfaces of the gate disposed therebetween; b. a ring defining a bore and extending downwardly from said chest in general planar alignment therewith; and c. a depression disposed within said bore for defining a seat for the gate; whereby, said liner avoids the assembly and disassembly of segregable elements during replacement of the gate guiding, seating and sealing elements of the gate valve.
Claim 2
Dependent Claim
122 words
In a gate valve having a positionable gate with opposing surfaces disposed therein for regulating the flow of fluid intermediate an attached pair of pipes, the improvement comprising a pliant liner molded in one piece for receiving, guiding and seating the gate, said liner including: a. a chest having a gate passageway with opposing sidewalls spaced from the opposing surfaces of the gate disposed therebetween; b. a ring defining a bore and extending downwardly from said chest in general planar alignment therewith; and c. a depression disposed within said bore for defining a seat for the gate; whereby, said liner avoids the assembly and disassembly of segregable elements during replacement of the gate guiding, seating and sealing elements of the gate valve.
Claim 3
Dependent Claim
80 words
The improvement as set forth in claim 1, said liner further including: a. first seal means disposed near the bottom of the opposing sidewalls within said chest and being in sealing contact with the gate for preventing a flow of fluid through said gate passageway intermediate said chest and the gate; and b. further seal means disposed within said depression for preventing a flow of fluid through the bore of said ring on seating of the gate within said depression.
Claim 4
Dependent Claim
28 words
The improvement as set forth in claim 2 wherein the material of said liner is functionally compatible with the material of the gate in contact with said liner.
Claim 5
Dependent Claim
28 words
The improvement as set forth in claim 3 wherein said liner and the material of the gate in contact with said liner are of the same non-metallic material.
Claim 6
Dependent Claim
34 words
The improvement as set forth in claim 2 wherein said seal means comprises at least one seal within said gate passageway and extending inwardly and transverse to the direction of movement of the gate.
Claim 7
Dependent Claim
36 words
The improvement as set forth in claim 5 wherein said further seal means comprises at least one annular D-ring seal disposed upon one side of said depression for sealing engagement with a face of the gate.
Claim 8
Dependent Claim
35 words
The improvement as set forth in claim 6 wherein said further seal means includes at least one D-ring seal disposed upon another side of said depression for sealing engagement with another face of the gate.
Claim 9
Dependent Claim
59 words
The improvement as set forth in claim 7 including yet further seal means disposed upon the axial ends of said ring of said liner for engagement with the axial ends of the attached one of the pair of pipes; whereby, said yet further seal means obviates the need for gaskets intermediate the gate valve and the pair of pipes.
References Cited (Backward Citations)
US2893684A
Cited
US2942841A
Cited
US3050077A
Cited
US3164363A
Cited
US3356334A
Cited
US3350058A
Cited
US3749114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |