US4037475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling device
Assignee: BP PLC
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Filing: 1976-03-23
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Granted: 1977-07-26
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Expires: 1996-03-23
Abstract
Abstract A sampling device for insuring a constant rate of sample flow from a conduit regardless of conduit pressure and medium viscosity, particularly in the high pressure and low viscosity ranges. In addition to the constant displacment pump a back pressure valve provides a constant pressure differential across the pump so that "slip" is maintained constant.
Inventors
- 👤 William Henry Topham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:56
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/20; G01N1/2035; G01N2001/2064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A liquid sampling device comprising a liquid conduit loop including a pair of ends adapted to be in open communication with a liquid source, a pump connected in said loop intermediate said ends for circulating liquid at a substantially constant rate from one of said ends to the other thereof and a sample outlet valve connected in said loop downstream from said pump for removing a sample of liquid from said loop, said valve having an outlet through which said sample flows, and a back-pressure valve connected between said outlet and said loop upstream of said pump, said back-pressure valve being responsive to the liquid pressures at said outlet and in said loop upstream of said pump and maintaining any difference between the pressure at said outlet and the pressure at said loop upstream of said pump substantially constant.
Claim 2
Dependent Claim
139 words
A liquid sampling device comprising a liquid conduit loop including a pair of ends adapted to be in open communication with a liquid source, a pump connected in said loop intermediate said ends for circulating liquid at a substantially constant rate from one of said ends to the other thereof and a sample outlet valve connected in said loop downstream from said pump for removing a sample of liquid from said loop, said valve having an outlet through which said sample flows, and a back-pressure valve connected between said outlet and said loop upstream of said pump, said back-pressure valve being responsive to the liquid pressures at said outlet and in said loop upstream of said pump and maintaining any difference between the pressure at said outlet and the pressure at said loop upstream of said pump substantially constant.
Claim 3
Dependent Claim
22 words
A liquid sampling device as set forth in claim 1, wherein the back-pressure valve is capable of withstanding pressures above 400 psig.
Claim 4
Dependent Claim
17 words
A liquid sampling device as set forth in claim 1, wherein said ratio is greater than one.
Claim 5
Dependent Claim
28 words
A liquid sampling device as set forth in claim 1 further comprising a sample container connected by a fluid conduit to said outlet of said sample outlet valve.
Claim 6
Dependent Claim
70 words
A liquid sampling device as set forth in claim 1, wherein said sample outlet valve is a three-way valve having two settings and which in one said setting thereof permits said liquid to flow from one of said ends to the other thereof and which in the other said setting thereof permits said liquid to flow from said one of said ends through said outlet of said sample outlet valve.
References Cited (Backward Citations)
US3282113A
Cited
US3377867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |