US3901474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve
Assignee: Taimei Kinzoku Kogyo Co Ltd
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Filing: 1973-12-27
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Granted: 1975-08-26
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Expires: 1993-12-27
Abstract
Abstract A rotary valve including a movable valve seat which is caused to be pressed against a rotary valve plug when the latter is positioned at its full close position or at its full close and full open positions and to be moved away from said rotary valve plug during the time the latter is being rotated to open or close the valve, by means of a fluid-pressure-means which is automatically actuated by the operation of a driving shaft for rotating said valve plug.
Inventors
- 👤 Yasuna Kubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:32
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/20; F16K5/205
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
343 words
A rotary valve comprising: a valve casing, a rotary valve plug in said valve casing, said plug being rotatable between its valve opening position and its valve closing position, a movable valve seat slidably mounted in said valve casing and movable between a first position in which the valve seat is pressed into contact with the valve plug to seal it and a second position in which the valve seat is out of contact with the valve plug, a rotatable valve rod connected to the valve plug for rotating the valve plug between its said valve opening position and its said valve closing position, a driving shaft rotatably supported in said valve casing, an operating means at one end portion of said driving shaft, a clutch interposed between the valve rod and the driving shaft, said clutch comprising: a driven member connected to said valve rod, said driven member being rotatable about an axis through a predetermined angle to rotate the valve plug between its said valve opening position and its said valve closing position, and a driving member connected to said driving shaft, said driving member being rotatable about an axis through an angle greater than said predetermined angle so as to make an angular rotation in addition to that of said driven member, a cylinder in the valve casing, a piston disposed around said driving shaft, said piston being axially slidable in said cylinder, means for moving said piston axially in said cylinder in response to the additional angular rotation of said driving member, and a fluid circuit for transmitting the axial movement of said piston to said movable valve seat whereby the movable valve seat is normally held in its said first position and is moved to its said second position by the rotation of the driving shaft corresponding to the additional rotation of said driving member and is held in said second position when said valve plug is being rotated by the rotation of the driving shaft corresponding to the rotation of the driven member through said predetermined angle.
Claim 2
Dependent Claim
343 words
A rotary valve comprising: a valve casing, a rotary valve plug in said valve casing, said plug being rotatable between its valve opening position and its valve closing position, a movable valve seat slidably mounted in said valve casing and movable between a first position in which the valve seat is pressed into contact with the valve plug to seal it and a second position in which the valve seat is out of contact with the valve plug, a rotatable valve rod connected to the valve plug for rotating the valve plug between its said valve opening position and its said valve closing position, a driving shaft rotatably supported in said valve casing, an operating means at one end portion of said driving shaft, a clutch interposed between the valve rod and the driving shaft, said clutch comprising: a driven member connected to said valve rod, said driven member being rotatable about an axis through a predetermined angle to rotate the valve plug between its said valve opening position and its said valve closing position, and a driving member connected to said driving shaft, said driving member being rotatable about an axis through an angle greater than said predetermined angle so as to make an angular rotation in addition to that of said driven member, a cylinder in the valve casing, a piston disposed around said driving shaft, said piston being axially slidable in said cylinder, means for moving said piston axially in said cylinder in response to the additional angular rotation of said driving member, and a fluid circuit for transmitting the axial movement of said piston to said movable valve seat whereby the movable valve seat is normally held in its said first position and is moved to its said second position by the rotation of the driving shaft corresponding to the additional rotation of said driving member and is held in said second position when said valve plug is being rotated by the rotation of the driving shaft corresponding to the rotation of the driven member through said predetermined angle.
Claim 3
Dependent Claim
83 words
A rotary valve as claimed in claim 1, wherein: said clutch comprises a dog clutch, said driven member is fixedly connected to said valve rod, said driving member is axially slidable on the driving shaft, said piston is integral with said driving member, means defining a guide groove in said piston, and said moving means comprises: a guiding mechanism which includes said guide groove, and a guide pin fixed on said cylinder, said guide pin having a portion which extends into said groove.
Claim 4
Dependent Claim
95 words
A rotary valve as claimed in claim 1 wherein: said driven member is fixedly connected to said valve rod, said driving member is axially slidable on said driving shaft and is resiliently biased against said driven member, said piston being slidably disposed in said cylinder so as to be only axially slidable therein, means defining a guide groove in said piston, and said moving means comprises: a guiding mechanism which includes said guide groove, and a guide pin fixed on said driving shaft, said guide pin having a portion which extends into said guide groove.
Claim 5
Dependent Claim
32 words
A rotary valve as claimed in claim 1, wherein: said movable valve seat is held in its said first position only when the valve plug is in its said valve closing position.
Claim 6
Dependent Claim
43 words
A rotary valve as claimed in claim 1, wherein: said movable valve seat is held in its said first position when the valve plug is in its said valve opening position and when the valve plug is in its said valve closing position.
References Cited (Backward Citations)
US3007490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |