US3767326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volumetric flow control system for pumps
Assignee: Yarway Corp
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Filing: 1972-08-04
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Granted: 1973-10-23
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Expires: 1992-08-04
Abstract
Abstract A control system for controlling the total volume of fluid dispensed at intermittent intervals from a continuously operating pump such as a piston operated diaphragm pump is disclosed. A valved bypass line is provided to bypass fluid from the working fluid chamber of the diaphragm pump back to the piston pump reservoir to selectively permit the working fluid to either actuate the diaphragm pump or return to the piston pump reservoir, depending on whether the bypass valve is open or closed. The bypass valve is operated by a control circuit which may be preset to accurately control the amount of fluid dispensed during each cycle of operation.
Inventors
- 👤 H Hetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:32
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/067; F04B49/00; F04B49/12; F04B49/121
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
In a piston operated diaphragm pump including a diaphragm pump having a working chamber and a pumping chamber separated by a flexible member, and a piston pump operating in fluid communication with a reservoir of pumping fluid to pulsate the pumping fluid into and out of the diaphragm pump working chamber to cause flexure of the flexible member and actuate the diaphragm pump, the improvement comprising: a bypass line providing fluid communication between the diaphragm pump working chamber and the reservoir of pumping fluid, valve means within the bypass line to open and close the bypass line, said bypass line when open permitting pulsations of pumping fluid to flow back and forth between the diaphragm pump working chamber and the reservoir of pumping fluid to thereby prevent flexure of the flexible member and operation of the diaphragm pump, and control means to control operation of the bypass line valve means.
Claim 2
Dependent Claim
150 words
In a piston operated diaphragm pump including a diaphragm pump having a working chamber and a pumping chamber separated by a flexible member, and a piston pump operating in fluid communication with a reservoir of pumping fluid to pulsate the pumping fluid into and out of the diaphragm pump working chamber to cause flexure of the flexible member and actuate the diaphragm pump, the improvement comprising: a bypass line providing fluid communication between the diaphragm pump working chamber and the reservoir of pumping fluid, valve means within the bypass line to open and close the bypass line, said bypass line when open permitting pulsations of pumping fluid to flow back and forth between the diaphragm pump working chamber and the reservoir of pumping fluid to thereby prevent flexure of the flexible member and operation of the diaphragm pump, and control means to control operation of the bypass line valve means.
Claim 3
Dependent Claim
67 words
Apparatus in accordance with claim 1 in which an outlet line is provided from the diaphragm pump and second valve means in the outlet line operates to open and close the outlet line, said control means operating to open the second valve means simultaneously with closing of the bypass line valve means and close the second valve means simultaneously with opening of the bypass line valve means.
Claim 4
Dependent Claim
56 words
Apparatus in accordance with claim 2 in which the bypass line valve means and the second valve means are solenoid operated valves, said control means including an electric circuit connected to the solenoids of both valves, and switch means in said electric circuit to complete and break the circuit to the solenoids of both valves simultaneously.
Claim 5
Dependent Claim
32 words
Apparatus in accordance with claim 1 in which means are provided to synchronize operation of said valve means with the end of a complete stroke of the piston of said piston pump.
Claim 6
Dependent Claim
59 words
Apparatus in accordance with claim 1 in which said control means includes an electric circuit to operate said valve means, and first switch means in said circuit operating in response to a demand for fluid from said diaphragm pump to start and stop the pumping operation of said diaphragm pump by closing and opening the bypass line valve means.
Claim 7
Dependent Claim
82 words
Apparatus in accordance with claim 5 in which second switch means are provided in said electric circuit, said second switch means operating to open and close in response to the stroke of the piston of said piston pump to synchronize the opening and closing of said bypass valve means with the stroke of the piston of said piston pump and only permit operation of said bypass valve means at the end of a complete stroke of the piston of said piston pump.
Claim 8
Dependent Claim
44 words
ApparatUs in accordance with claim 6 in which said second switch means includes at least one microswitch interconnected with the piston of said piston pump with said microswitch being opened and closed in response to the position of the piston of said piston pump.
Claim 9
Dependent Claim
68 words
Apparatus in accordance with claim 5 including a counter in said electric circuit to count pulses of said piston operation after operation of said first switch means, said counter operating to open the circuit to said valve means after the count of preset number of pulses to stop discharge of fluid from said diaphragm pump after a predetermined quantity of fluid has been dispensed by said diaphragm pump.
Claim 10
Dependent Claim
82 words
Apparatus in accordance with claim 8 in which second switch means are provided in said electric circuit, said second switch means operating to open and close in response to the stroke of the piston of said piston pump to synchronize the opening and closing of said bypass valve means with the stroke of the piston of said piston pump and only permit operation of said bypass valve means at the end of a complete stroke of the piston of said piston pump.
Claim 11
Dependent Claim
44 words
Apparatus in accordance with claim 9 in which said second switch means includes at least one microswitch interconnected with the piston of said piston pump with said microswitch being opened and closed in response to the position of the piston of said piston pump.
References Cited (Backward Citations)
US1576571A
Cited
US3374750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |