US4527415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for checking the set pressure of a safety valve
Assignee: Electricite de France SA
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Filing: 1983-10-28
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Granted: 1985-07-09
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Expires: 2003-10-28
Abstract
Abstract The apparatus for checking the set pressure of a safety valve (300) comprises: a first tank (100) filled with a first fluid (110) at a pressure less than the set pressure, and connected to the fluid inlet tubing (310) of the valve; a second tank (200) filled with a second fluid (210) at a pressure greater than the set pressure; means (410) for rapidly putting the two tanks into communication with each other; and means (500, 510, 520) for simultaneously measuring the pressure in the fluid inlet tubing and the displacement of the valve plate.
Inventors
- 👤 Jean Chabat-Courrede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:56
CPC Classifications
F; F16; F16K; F16K17/00; F16K37/00; F16K37/0075; F16K37/0083; F16K37/0091
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
Apparatus for measuring the set pressure of a safety valve having inlet tubing and a valve plate which is displaced whenever the fluid pressure in said inlet tubing is greater than said set pressure, wherein the apparatus comprises said safety valve being in combination with: a first tank filled with a first fluid at a pressure less than the set pressure to be checked, and connected to the fluid inlet tubing of the safety valve to be checked; a second tank filled with a second fluid at a pressure greater than said set pressure; rapid communication means for rapidly putting said first and second tanks into fluid pressure communication with each other; means connected to the valve to be checked, to measure both the pressure in said fluid inlet tubing and the displacement of said valve plate simultaneously; and means for isolating said first fluid from said second fluid, while the tanks are in fluid pressure communication with each other.
Claim 2
Dependent Claim
160 words
Apparatus for measuring the set pressure of a safety valve having inlet tubing and a valve plate which is displaced whenever the fluid pressure in said inlet tubing is greater than said set pressure, wherein the apparatus comprises said safety valve being in combination with: a first tank filled with a first fluid at a pressure less than the set pressure to be checked, and connected to the fluid inlet tubing of the safety valve to be checked; a second tank filled with a second fluid at a pressure greater than said set pressure; rapid communication means for rapidly putting said first and second tanks into fluid pressure communication with each other; means connected to the valve to be checked, to measure both the pressure in said fluid inlet tubing and the displacement of said valve plate simultaneously; and means for isolating said first fluid from said second fluid, while the tanks are in fluid pressure communication with each other.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, wherein said means for isolating said first and second fluids comprise a deformable membrane disposed inside said first tank.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 1, wherein the volume of said second tank is between 2 to 6 times the volume of said first tank.
Claim 5
Dependent Claim
24 words
Apparatus according to claim 1, wherein the pressure inside said first tank lies between 80% and 95% of said set pressure to be checked.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 1, wherein the pressure inside said second tank lies between 110% and 140% of said set pressure to be checked.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 1, wherein a flow rate controlling cock is provided in series with said rapid communication means.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |