Patent US3811279A successfully refreshed from Google Patents.
US3811279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shut-off valve for a working medium circuit
Assignee: Sulzer AG
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Filing: 1971-05-21
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Granted: 1974-05-21
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Expires: 1991-05-21
Abstract
Abstract The shut-off valve is operated via a servo-motor under the influence of the working medium in the circuit. One side of the servo-piston is connected to a first pressure point in the circuit while the opposite side is connected to a second pressure point in the circuit of different pressure. Control valves are also provided to reverse the connections of the pressure points to the servo-motor and to supply the working medium to the servomotor. Depending on the valve condition required, the control valves are manipulated to permit opening or closing of the valve.
Inventors
- 👤 E Vogeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:41
CPC Classifications
G; G21; G21D; G21D3/00; G21D3/04; F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/141; F01D17/145; F01K; F01K3/00; F01K3/18; F01K3/181; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F16K31/00; F16K31/12; F16K31/122; F16K31/124; F16K31/36; F16K31/40; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
In combination with a working medium circuit including a feed pump and a working medium expansion means; a shut-off valve located between said feed pump and said expansion means for controlling a flow of working medium to said expansion means; a servo-motor connected to said shut-off valve to open and close said shut-off valve, said servo-motor having a piston and cylinder assembly, a chamber of each opposite side of said piston connected to a first point and to a second point in said working medium circuit, said first point being between said feed pump and said shut-off valve in the direction of flow of working medium and said second point being between said expansion means and said feed pump in the direction of flow of working medium; and control valve means between each chamber and said first and second points to control a flow of working medium therebetween.
Claim 2
Dependent Claim
148 words
In combination with a working medium circuit including a feed pump and a working medium expansion means; a shut-off valve located between said feed pump and said expansion means for controlling a flow of working medium to said expansion means; a servo-motor connected to said shut-off valve to open and close said shut-off valve, said servo-motor having a piston and cylinder assembly, a chamber of each opposite side of said piston connected to a first point and to a second point in said working medium circuit, said first point being between said feed pump and said shut-off valve in the direction of flow of working medium and said second point being between said expansion means and said feed pump in the direction of flow of working medium; and control valve means between each chamber and said first and second points to control a flow of working medium therebetween.
Claim 3
Dependent Claim
44 words
The combination as set forth in claim 1 which further includes a line connecting said feed pump to said expansion means, and wherein said shut-off valve includes a body connected into said line and said servo-motor is connected to said body outside said line.
Claim 4
Dependent Claim
34 words
The combination as set forth in claim 1 which further includes a line connecting said feed pump to said expansion means, and wherein said shut-off valve and said servo-motor are located in said line.
Claim 5
Dependent Claim
33 words
The combination as set forth in claim 1 wherein at least one of said points is situated in a portion of said circuit in which the working medium is liquid during normal operation.
Claim 6
Dependent Claim
48 words
The combination as set forth in claim 1 which further includes a liquid reservoir interconnected between one of said points and said chambers of said servo-motor, said one of said points being connected to a portion of said circuit in which the working medium is in vapor form.
Claim 7
Dependent Claim
37 words
The combination as set forth in claim 1 wherein said control valve means communicates each chamber with said first point when said shut-off valve is closed to equalize and to maintain equalized the pressure in each chamber.
Claim 8
Dependent Claim
99 words
The combination as set forth in claim 1 wherein said valve includes a spherical valve body, a guide within said valve body and a valve closure member for selective seating against said guide and said valve body; said servo-motor includes a cover mounted on said body and secured to said guide to define a servo-cylinder, and said piston is slidably mounted in said guide and said cover to divide said servo-cylinder into said chambers and is connected to said valve closure member; said valve closure member, guide, cover and piston forming a unit removably secured to said valve body.
Claim 9
Dependent Claim
40 words
The combination as set forth in claim 1 wherein said control valve means communicates each chamber with said second point when said shut-off valve is closed to equalize and maintain equalized the pressure in each chamber and said second point.
Claim 10
Dependent Claim
39 words
The combination as set forth in claim 1 wherein a natural circulation cooling system is connected to each chamber of said servo-motor to ensure against vapor formation in each chamber, said system including a condenser connected to each chamber.
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |