US3893469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary plug valve
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1974-12-16
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Granted: 1975-07-08
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Expires: 1994-12-16
Abstract
Abstract An improved rotary plug valve is disclosed which is lighter and less costly than conventional valves and which permits easy service, removal and installation of the plug after the valve is welded in line. These benefits are the result of the novel structural relationship between an access port in the side wall of the main valve housing and the plug. The access port is made just slightly larger than the main flow cavity sealed by the plug and is located so that the plug''s seal is completely exposed for service and inspection when the valve is in the open position. The plug, which is larger than the access port, is given a Ushaped configuration which permits it to pass through the access port.
Inventors
- 👤 Joseph Winston Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:20
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/06; F16K5/0626; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86292; Y10T137/863
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
224 words
In a rotary plug valve containing a main valve housing with a circular main flow cavity therein and a rotary plug to control fluid flow therethrough journaled on an axis of rotation within the main valve housing, the improvement comprising: a. a C-shaped rotary plug having two ears and a face, journaled on removable trunnions; b. circular seal means mounted on the face of the plug for fluid-tight engagement against a sealing surface surrounding the main flow cavity when the valve is in a closed position; c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to the fluid flow, the seal means being completely exposed through the port when the valve is in an open position; whereby the C-shaped rotary plug and its circular seal means may each be inspected, serviced, installed or removed through a single access port only 1.0-1.6 times greater in cross-sectional area than the cross-sectional area of the main flow cavity.
Claim 2
Dependent Claim
224 words
In a rotary plug valve containing a main valve housing with a circular main flow cavity therein and a rotary plug to control fluid flow therethrough journaled on an axis of rotation within the main valve housing, the improvement comprising: a. a C-shaped rotary plug having two ears and a face, journaled on removable trunnions; b. circular seal means mounted on the face of the plug for fluid-tight engagement against a sealing surface surrounding the main flow cavity when the valve is in a closed position; c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to the fluid flow, the seal means being completely exposed through the port when the valve is in an open position; whereby the C-shaped rotary plug and its circular seal means may each be inspected, serviced, installed or removed through a single access port only 1.0-1.6 times greater in cross-sectional area than the cross-sectional area of the main flow cavity.
Claim 3
Dependent Claim
11 words
The valve of claim 1 wherein the seal means is singular.
Claim 4
Dependent Claim
14 words
The valve of claim 1 wherein one of the trunnions passes through the housing.
Claim 5
Dependent Claim
25 words
The valve of claim 1 wherein the access port is concentric with the seal means when the plug is moved to the valve''s open position.
Claim 6
Dependent Claim
51 words
The valve of claim 1 wherein the plug''s axis of rotation is displaced from the axis of the main flow cavity so that the plug effects a fluid-tight engagement with the housing through an eccentric motion of the plug relative to the surface of the housing surrounding the main flow cavity.
Claim 7
Dependent Claim
17 words
The valve of claim 1 wherein the plug is rotated 90* from the closed position for removal.
Claim 8
Dependent Claim
227 words
A rotary plug valve for controlling the flow of fluid therethrough, comprising: a. a main valve housing having a circular main flow cavity surrounded by a sealing surface; b. a C-shaped rotary plug having two ears and a face, journally mounted on removable trunnions on an axis of rotation within the housing and having a single circular seal means mounted on the face of the plug to effectuate fluid-tight engagement with the sealing surface surrounding the main flow cavity when the valve is in a closed position; and c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated 90* from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to thE fluid flow, the seal means being completely exposed through the port when the valve is in an open position; whereby the C-shaped rotary plug and its circular seal means may each be inspected, serviced, installed, or removed through a single access port only 1.0-1.6 times greater in cross-sectional area than the cross-sectional area of the main flow cavity.
Claim 9
Dependent Claim
227 words
A rotary plug valve for controlling the flow of fluid therethrough, comprising: a. a main valve housing having a circular main flow cavity surrounded by a sealing surface; b. a C-shaped rotary plug having two ears and a face, journally mounted on removable trunnions on an axis of rotation within the housing and having a single circular seal means mounted on the face of the plug to effectuate fluid-tight engagement with the sealing surface surrounding the main flow cavity when the valve is in a closed position; and c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated 90* from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to thE fluid flow, the seal means being completely exposed through the port when the valve is in an open position; whereby the C-shaped rotary plug and its circular seal means may each be inspected, serviced, installed, or removed through a single access port only 1.0-1.6 times greater in cross-sectional area than the cross-sectional area of the main flow cavity.
Claim 10
Dependent Claim
161 words
A rotary plug valve for controlling the flow of fluid therethrough, comprising: a. a main valve having a circular main flow cavity therein; b. a C-shaped rotary plug having two ears and a face, journally mounted on removable trunnions on an axis of rotation within the housing and having a single circular seal means mounted on the face of the plug; and c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to the fluid flow, the seal means being completely exposed through the port when the valve is in an open position.
Claim 11
Dependent Claim
161 words
A rotary plug valve for controlling the flow of fluid therethrough, comprising: a. a main valve having a circular main flow cavity therein; b. a C-shaped rotary plug having two ears and a face, journally mounted on removable trunnions on an axis of rotation within the housing and having a single circular seal means mounted on the face of the plug; and c. a circular access port having a diameter that is smaller than the exterior ear-to-ear distance of the plug but large enough to permit insertion or removal of the plug by manipulation when the plug''s trunnions and seal are removed and the plug is rotated from the closed position, having a cross-sectional area of 1.0-1.6 times greater than the cross-sectional area of the main flow cavity, and having a location in a side wall of the housing parallel to the fluid flow, the seal means being completely exposed through the port when the valve is in an open position.
Claim 12
Dependent Claim
14 words
The valve of claim 8 wherein one of the trunnions passes through the housing.
Claim 13
Dependent Claim
51 words
The valve of claim 8 wherein the plug''s axis of rotation is displaced from the axis of the main flow cavity so that the plug effects a fluid-tight engagement with the housing through an eccentric motion of the plug relative to the surface of the housing surrounding the main flow cavity.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |