US3684236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined hydraulic dump and control valve structure
Assignee: Westinghouse Electric Corp
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Filing: 1970-08-17
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Granted: 1972-08-15
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Expires: 1990-08-17
Abstract
Abstract A valve structure for dumping and/or controlling hydraulic fluid for actuating a servo-motor system comprising a first movable valve member and a second movable valve member both slidably disposed within the housing structure of the valve. First and second pressurized fluids, responsive to external signals, cooperatively regulate the movement of both valve members in the closing direction, to establish and to control the pressure of the actuating hydraulic fluid. The second pressurized fluid independently regulates the movement of the second valve member in the closing direction to block and unblock the actuating fluid in the servo-motor system. On loss of pressure from the external signals, a spring member associated with each valve member moves each corresponding valve member in the opening direction, to either a partially open position to control the actuating fluid pressure, or a fully open position to dump the actuating fluid. The valve structure is employed in a servo-motor system which is used to regulate a steam control valve. This control valve is used in a steam inlet conduit for a steam turbine to regulate the quantity of steam supplied to the turbine.
Inventors
- 👤 Ivor J Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:55
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
281 words
A hydraulically actuated valve for controlling and dumping actuating fluid of a servo-motor system comprising: a housing; first movable valve member concentrically disposed in said housing; a second movable valve member concentrically disposed in said housing; first and second means for providing fluid pressure acting directly on and moving said first and second valve members, respectively, in one direction to seat said valve members and maintain the pressure of the actuating fluid; first spring means for moving said first valve member in dumping direction opposite to said seating direction upon loss of pressure from said first fluid providing means; second spring means for moving said second valve member in said dumping direction upon loss of pressure from said second fluid providing means; said first valve member being disposed to dump said second fluid upon loss of pressure from said first fluid providing means; said housing having an actuating fluid chamber, an inlet actuating fluid conduit and an outlet actuating fluid conduit, said conduits being in communication with said chamber and said second valve member being so disposed within said housing as to be in blocking relation with said outlet conduit when moved in said seated direction, said valve members being so disposed within said housing as to be free from forces in actuating direction applied thereto by said actuating fluid when the second valve member is in its seated position; said second valve member being so disposed as to be actuated by said second fluid providing means for independently moving said second valve member to control the flow of actuating fluid between said inlet and outlet conduit and to dump said actuating fluid upon loss of pressure of said second fluid.
Claim 2
Dependent Claim
281 words
A hydraulically actuated valve for controlling and dumping actuating fluid of a servo-motor system comprising: a housing; first movable valve member concentrically disposed in said housing; a second movable valve member concentrically disposed in said housing; first and second means for providing fluid pressure acting directly on and moving said first and second valve members, respectively, in one direction to seat said valve members and maintain the pressure of the actuating fluid; first spring means for moving said first valve member in dumping direction opposite to said seating direction upon loss of pressure from said first fluid providing means; second spring means for moving said second valve member in said dumping direction upon loss of pressure from said second fluid providing means; said first valve member being disposed to dump said second fluid upon loss of pressure from said first fluid providing means; said housing having an actuating fluid chamber, an inlet actuating fluid conduit and an outlet actuating fluid conduit, said conduits being in communication with said chamber and said second valve member being so disposed within said housing as to be in blocking relation with said outlet conduit when moved in said seated direction, said valve members being so disposed within said housing as to be free from forces in actuating direction applied thereto by said actuating fluid when the second valve member is in its seated position; said second valve member being so disposed as to be actuated by said second fluid providing means for independently moving said second valve member to control the flow of actuating fluid between said inlet and outlet conduit and to dump said actuating fluid upon loss of pressure of said second fluid.
Claim 3
Dependent Claim
21 words
The structure recited in claim 1 wherein a portion of second valve member is slidably disposed within the first valve member.
Claim 4
Dependent Claim
99 words
The structure recited in claim 1, wherein the first and second valve members are so disposed within the housing that the second fluid providing means also acts directly on the first valve member urging it in a direction opposite said seating direction, the second fluid providing means thereby cooperating with the first spring means to accelerate the first valve member rapidly in a direction opposite said seating direction to rapidly drop the pressure of said second fluid to cause said second valve member to move rapidly in a direction opposite said seating direction to rapidly dump said actuating fluid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |