US3630639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction line vent valve for reciprocating pumps
Assignee: AIRCRYO Inc A CA CORP
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Filing: 1969-10-31
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Granted: 1971-12-28
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Expires: 1989-10-31
Abstract
Abstract This invention relates to an automatically controlled vent valve in a vent line connected to the suction line in a cryogenic pumping system. The vent valve is in an open position during the cooldown cycle and is moved to a closed position after the system has reached desired operating conditions. Blowby gas which leaks around the piston of the pumping system provides the pressure for closing the vent valve. The vent valve contains an orifice through which the blowby gas bleeds and returns to the storage vessel for the cryogenic fluid being pumped.
Inventors
- 👤 Paul P Duron
- 👤 Thomas A Carter Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:02
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162; F04B53/164; F04B15/00; F04B15/06; F04B15/08; F04B53/06; Y; Y10; Y10S; Y10S417/00; Y10S417/901
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
61 words
A method of automatically controlling the venting of a suction line supplying a pump for liquid having a low boiling temperature during pump start-up, comprising venting the suction line until the pump cools down and the discharge pressure of the pump reaches a normal level, and then utilizing pressure developed by the blowby gas of said pump to terminate said venting.
Claim 2
Independent Claim
61 words
A method of automatically controlling the venting of a suction line supplying a pump for liquid having a low boiling temperature during pump start-up, comprising venting the suction line until the pump cools down and the discharge pressure of the pump reaches a normal level, and then utilizing pressure developed by the blowby gas of said pump to terminate said venting.
Claim 3
Dependent Claim
102 words
A high pressure pump for liquid having a low boiling temperature comprising a pumping chamber, a piston mounted for reciprocating movement in said chamber, exhaust valve means for said chamber, intake means communicating with said chamber, means to vent vapor from said intake means, further vent means to vent blowby gas which has passed around said piston, control means to continue the venting of vapor in said first vent means during pump cooldown and to terminate said venting upon the completion of cooldown, said control means being operative in response to an operating condition of the pump attained when coolDown is completed.
Claim 4
Dependent Claim
102 words
A high pressure pump for liquid having a low boiling temperature comprising a pumping chamber, a piston mounted for reciprocating movement in said chamber, exhaust valve means for said chamber, intake means communicating with said chamber, means to vent vapor from said intake means, further vent means to vent blowby gas which has passed around said piston, control means to continue the venting of vapor in said first vent means during pump cooldown and to terminate said venting upon the completion of cooldown, said control means being operative in response to an operating condition of the pump attained when coolDown is completed.
Claim 5
Dependent Claim
61 words
A pump for liquid having a low boiling temperature comprising a pump housing having means therein for raising the pressure of said liquid, intake means for said pump housing, vent means for venting vapor from said intake means before the vapor reaches the pressure raising means, valve means to control said vent means dependent on the discharge pressure of said pump.
Claim 6
Dependent Claim
61 words
A pump for liquid having a low boiling temperature comprising a pump housing having means therein for raising the pressure of said liquid, intake means for said pump housing, vent means for venting vapor from said intake means before the vapor reaches the pressure raising means, valve means to control said vent means dependent on the discharge pressure of said pump.
Claim 7
Dependent Claim
57 words
A high pressure pump for liquid having a low boiling temperature comprising a suction line, a discharge line, means to vent vapor formed in said suction line during the cooldown cycle, means to vent blowby gas from said high pressure pump, further means responsive to the pressure of said blowby gas for regulating the first-mentioned vent means.
Claim 8
Dependent Claim
57 words
A high pressure pump for liquid having a low boiling temperature comprising a suction line, a discharge line, means to vent vapor formed in said suction line during the cooldown cycle, means to vent blowby gas from said high pressure pump, further means responsive to the pressure of said blowby gas for regulating the first-mentioned vent means.
Claim 9
Dependent Claim
62 words
A high pressure pump for liquified gases having low boiling temperatures comprising a pumping chamber, intake means to direct low pressure liquified gas to the pumping chamber, discharge means to direct high pressure liquified gas from the pumping chamber, means to vent vapor from said intake means, further means to control said vent means dependent on the discharge pressure of said pump.
Claim 10
Dependent Claim
62 words
A high pressure pump for liquified gases having low boiling temperatures comprising a pumping chamber, intake means to direct low pressure liquified gas to the pumping chamber, discharge means to direct high pressure liquified gas from the pumping chamber, means to vent vapor from said intake means, further means to control said vent means dependent on the discharge pressure of said pump.
Claim 11
Dependent Claim
57 words
A pump as defined in claim 5 further comprising additional vent means for venting blowby gas from said pumping chamber, said further means including valve means in said first vent means, said additional vent means directing blowby gas to actuate said valve means to close said first vent means when a predetermined blowby gas pressure is reached.
Claim 12
Dependent Claim
78 words
A pumping system for a liquid having a low boiling temperature comprising storage means for said liquid, a pump, a suction line connected to said storage means for supplying liquid to said pump, first vent means for passing gas formed in said suction line back to said storage means, further vent means to pass blowby gas back to said storage means, means to close and open said first vent means dependent on pressure created by the blowby gas.
Claim 13
Dependent Claim
78 words
A pumping system for a liquid having a low boiling temperature comprising storage means for said liquid, a pump, a suction line connected to said storage means for supplying liquid to said pump, first vent means for passing gas formed in said suction line back to said storage means, further vent means to pass blowby gas back to said storage means, means to close and open said first vent means dependent on pressure created by the blowby gas.
Claim 14
Dependent Claim
22 words
A pumping system according to claim 7 in which said closure means is a valve adapted to close said first vent means.
Claim 15
Dependent Claim
30 words
A pumping system according to claim 8 in which said further vent means communicates with said valve, said valve having an opening to restrict the passage of blowby gas therethrough.
Claim 16
Dependent Claim
26 words
A pumping system according to claim 9 in which the valve is gravity loaded and is moved by a predetermined pressure created by the blowby gas.
Claim 17
Dependent Claim
24 words
A pumping system according to claim 10 said opening in the valve allowing the blowby gas to continuously pass back to the storage means.
Claim 18
Dependent Claim
94 words
A reciprocating pump for liquid having a low boiling temperature comprising a piston chamber and a piston within, a suction line for said pump, a discharge line for said pump, valve means controlling the entrance and the exhaust of the liquid from said pump, a first vent passage for said suction line to remove gas therefrom, a second vent passage for removing blowby gas from said piston chamber, vent valve means in the first vent passage to control flow therethrough, said second vent passage communicating with said vent valve means to actuate the same.
Claim 19
Dependent Claim
94 words
A reciprocating pump for liquid having a low boiling temperature comprising a piston chamber and a piston within, a suction line for said pump, a discharge line for said pump, valve means controlling the entrance and the exhaust of the liquid from said pump, a first vent passage for said suction line to remove gas therefrom, a second vent passage for removing blowby gas from said piston chamber, vent valve means in the first vent passage to control flow therethrough, said second vent passage communicating with said vent valve means to actuate the same.
Claim 20
Dependent Claim
29 words
A pump according to claim 12, in which said vent valve means comprises a gravity loaded valve having an orifice therein for restricting the flow of blowby gas therethrough.
Claim 21
Dependent Claim
16 words
A pump according to claim 12 in which the vent valve means is adjustably spring loaded.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |