Patent FR2372622A1 successfully refreshed from Google Patents.
US3811792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pressure control system for pumps
Assignee: Corken Inc
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Filing: 1973-06-01
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Granted: 1974-05-21
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Expires: 1993-06-01
Abstract
Abstract The discharge pressure of a positive displacement pump is increased from a low regulated value to a higher value in response to outflow through a valve-controlled delivery conduit, by flow responsive control of a by-pass valve, the bias of which may be adjustable during pump operation to change the regulated discharge pressure. Flow in the delivery conduit is detected by displacement of a flow reaction disc from a position within the pump outlet port through which continuous fluid communication is established.
Inventors
- 👤 W Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:09
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/24; F04C14/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
In combination with a positive displacement pump having a low pressure inlet chamber and a high pressure outlet chamber connected to a valve controlled, fluid delivery conduit, flow responsive pressure control means, comprising by-pass valve means responsive to a regulated outlet pressure for regulating fluid pressure in the outlet chamber at relatively low and high pressure values, said bypass valve means including means for adjusting the valve closing bias thereof, passage means through which continuous fluid communication is established between the delivery conduit and the outlet chamber under both said low and high pressure values and flow sensing means within said passage means for establishing substantially unrestricted fluid communication between the outlet chamber and the adjusting means of the by-pass valve means in response to flow through the delivery conduit to increase the regulated pressure in the outlet chamber to said high pressure value.
Claim 2
Dependent Claim
144 words
In combination with a positive displacement pump having a low pressure inlet chamber and a high pressure outlet chamber connected to a valve controlled, fluid delivery conduit, flow responsive pressure control means, comprising by-pass valve means responsive to a regulated outlet pressure for regulating fluid pressure in the outlet chamber at relatively low and high pressure values, said bypass valve means including means for adjusting the valve closing bias thereof, passage means through which continuous fluid communication is established between the delivery conduit and the outlet chamber under both said low and high pressure values and flow sensing means within said passage means for establishing substantially unrestricted fluid communication between the outlet chamber and the adjusting means of the by-pass valve means in response to flow through the delivery conduit to increase the regulated pressure in the outlet chamber to said high pressure value.
Claim 3
Dependent Claim
63 words
The combination of claim 1 wherein said passage means includes a valve casing enclosing a connecting chamber between the outlet chamber and the delivery conduit, means for supporting the flow sensing means within said connecting chamber and a flow port formation internally mounted within said connecting chamber into which the flow sensing means is biased under substantially no-flow conditions within the delivery conduit.
Claim 4
Dependent Claim
79 words
The combination of claim 2 wherein said flow sensing means includes a valve element through which a flow passage is formed, a flow reaction disc connected to said valve element dimensioned to be received with clearance within said flow port formation, and means biasing said disc to a position within the flow port formation for completely blocking flow between the outlet chamber and the adjusting means of the by-pass valve means through said flow passage in the valve element.
Claim 5
Dependent Claim
47 words
The combination of claim 3 including filter means mounted on the flow reaction disc for conducting filtered flow of fluid into the flow passage of the valve element to the adjusting means of the by-pass valve means when the disc is displaced from the flow port formation.
Claim 6
Dependent Claim
71 words
The combination of claim 4 wherein said by-pass valve means comprises a valve member biased to a position blocking flow between the inlet and outlet chambers, said adjusting means including slidable piston means exposed to pressures in the inlet chamber and the passage means for controllably biasing the valve member to said flow blocking position and adjustable stop means for limiting movement of the piston means in a valve closing direction.
Claim 7
Dependent Claim
73 words
The combination of claim 5 wherein said adjustable stop means comprises a support sleeve on which the piston means is slidable, a stem projecting through the piston means in threaded engagement with said sleeve, a stop element connected to said stem within the inlet chamber against which the piston means abuts, and means connected to the stem externally of the by-pass valve means for axially displacing the stem to reposition the stop element.
Claim 8
Dependent Claim
32 words
The combination of claim 6 including seal means engageable with the sleeve of the adjustable stop means for limiting leakage to flow from the inlet chamber between the stem and the sleeve.
Claim 9
Dependent Claim
40 words
The combination of claim 7 including speed control means connected to the flow passage in the valve element of the flow sensing means for increasing the speed of the pump in response to flow of fluid through the delivery conduit.
Claim 10
Dependent Claim
40 words
The combination of claim 3 including speed control means connected to the flow passage in the valve element of the flow sensing means for increasing the speed of the pump in response to flow of fluid through the delivery conduit.
Claim 11
Dependent Claim
71 words
The combination of claim 1 wherein said by-pass valve means comprises a valve member biased to a position blocking flow between the inlet and outlet chambers, said adjusting means including slidable piston means exposed to pressurEs in the inlet chamber and the passage means for controllably biasing the valve member to said flow blocking position and adjustable stop means for limiting movement of the piston means in a valve closing direction.
Claim 12
Dependent Claim
73 words
The combination of claim 10 wherein said adjustable stop means comprises a support sleeve on which the piston means is slidable, a stem projecting through the piston means in threaded engagement with said sleeve, a stop element connected to said stem within the inlet chamber against which the piston means abuts, and means connected to the stem externally of the by-pass valve means for axially displacing the stem to reposition the stop element.
Claim 13
Dependent Claim
32 words
The combination of claim 11 including seal means engageable with the sleeve of the adjustable stop means for limiting leakage to flow from the inlet chamber between the stem and the sleeve.
Claim 14
Dependent Claim
26 words
The combination of claim 10 including seal means mounted on the piston means for confining leakage flow to the adjustable stop means from the inlet chamber.
Claim 15
Dependent Claim
32 words
The combination of claim 1 including speed control means connected to the flow sensing means for increasing the speed of the pump in response to flow of fluid through the delivery conduit.
References Cited (Backward Citations)
US3266425A
Cited
US3266426A
Cited
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 |