US3779384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-regulated diaphragm pump
Assignee: Individual
•
Filing: 1972-01-17
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Granted: 1973-12-18
•
Expires: 1992-01-17
Abstract
Abstract A piston-operated diaphragm pump for pumping liquids containing solids in suspension has a pump chamber divided into primary and secondary sides by a flexible diaphragm reciprocated by hydraulic pressure produced by a piston acting on a clean liquid in the primary side of the chamber. The solids-containing liquid from the secondary side of the pump is delivered via a closed tank to a treatment such as filtration. The clean liquid is circulated through a fluid circuit which includes a throttle valve operated by a rise in pressure in the closed tank, so that if the backpressure of the solids-containing liquid rises above a predetermined level e.g., due to filter blockage, the flow of clean liquid in the fluid circuit is throttled and the amount of clean liquid in the primary side of the pump thereby reduced to effect a corresponding reduction in the delivery rate and pressure of the pump.
Inventors
- 👤 F Stahlkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A piston-operated diaphragm pump for pumping a liquid containing solids in suspension, comprising a pump body defining a pump chamber, a diaphragm dividing the chamber into a primary side and a secondary side, a piston in the chamber on the primary side operable to reciprocate the diaphragm by hydraulic pressure on clean liquid in the primary side, an inlet and an outlet in the secondary side, through which the solids-containing liquid is induced to flow by reciprocation of the diaphragm, a closed tank having an inlet for receiving the solids-containing liquid from the pump, an outlet in the tank for said liquid, and means for varying the quantity of clean liquid in the primary side of the pump chamber in dependence on the pressure in said tank.
Claim 2
Dependent Claim
127 words
A piston-operated diaphragm pump for pumping a liquid containing solids in suspension, comprising a pump body defining a pump chamber, a diaphragm dividing the chamber into a primary side and a secondary side, a piston in the chamber on the primary side operable to reciprocate the diaphragm by hydraulic pressure on clean liquid in the primary side, an inlet and an outlet in the secondary side, through which the solids-containing liquid is induced to flow by reciprocation of the diaphragm, a closed tank having an inlet for receiving the solids-containing liquid from the pump, an outlet in the tank for said liquid, and means for varying the quantity of clean liquid in the primary side of the pump chamber in dependence on the pressure in said tank.
Claim 3
Dependent Claim
81 words
A pump according to claim 1, wherein the primary side of the pump chamber is provided with an inlet and an outlet for clean liquid, and said means for varying the quantity of clean liquid in the primary side comprises a fluid circuit of clean liquid connecting said inlet to said outlet and a regulating valve in said circuit operable to throttle the flow of liquid through said circuit on a rise in pressure in said tank above a predetermined level.
Claim 4
Dependent Claim
40 words
A pump according to claim 2, wherein the inlet in the primary side of the pump chamber includes a diaphragm controlled valve operable to allow a flow of clean liquid into the chamber during the suction stroke of the diaphragm.
Claim 5
Dependent Claim
33 words
A pump according to claim 3, wherein said fluid circuit includes a container for clean liquid, said container having an inlet and an outlet for said liquid, said inlet incorporating a non-return valve.
Claim 6
Dependent Claim
40 words
A pump according to claim 4, wherein the primary side of the pump is provided with a pressure safety device comprising a second outlet in the primary side whiCh communicates with said clean liquid container through a spring-biassed non-return valve.
Claim 7
Dependent Claim
37 words
A pump according to claim 2, wherein the regulating valve comprises a diaphragm in a wall of the tank operable above a predetermined air pressure in the tank to throttle the flow of fluid in said circuit.
References Cited (Backward Citations)
US2430097A
Cited
US3101058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |