US3580420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evacuation system for pipeline discharging pump
Assignee: CORKEN PUMP Co
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Filing: 1969-01-27
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Granted: 1971-05-25
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Expires: 1989-01-27
Abstract
Abstract A vacuum relief valve installed on the suction side of a pump employed with a compartmented tank on a fuel delivery vehicle or the like to enable the pump and associated piping system to be completely purged of fuel that has been conveyed by the pump from one compartment to a delivery nozzle before the piping system for the pump is communicated with another compartment of the tank having a different fuel therein for eliminating contamination of one fuel with another during sequential delivery of various types of fuel from the various compartments of the multicompartment tank to a delivery point.
Inventors
- 👤 Garth P Kennedy
- 👤 William E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:42
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/032; B08B9/0321; B08B9/035; B60; B60P; B60P3/00; B60P3/22; B60P3/224; B60P3/225; B67; B67D; B67D7/00; B67D7/06; B67D7/58; B67D7/62; B67D7/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
An evacuation system for a pump and inlet pipe system employed to pump diverse fluids from diverse sources and including in combination a pump, an inlet pipe system communicated with diverse sources of diverse fluids, valve means for selectively interrupting communication of the inlet pipe system with the source of fluids, and a vacuum relief valve means communicated with the inlet side of the pump and inlet pipe system for admitting air into the pump and inlet pipe system when the pump is operated with the communication with the source of fluids interrupted thereby enabling the pump to purge itself and the inlet pipe system of a fluid just pumped prior to communication of the pump and inlet pipe system with a different fluid thereby enabling the pump to operate as a low pressure air blower when purging itself and the inlet pipe system, said vacuum relief valve means being in the form of a ball check valve, spring means urging said check valve into closed position to prevent leakage of fluid during normal pumping operation and retaining the ball check valve in closed position until the pump induces a vacuum in the pump and inlet pipe system when communication with the fluid source is interrupted thus eliminating spillage of fuel and premature opening of the relief valve thereby eliminating the possibility of the pump losing vacuum.
Claim 2
Dependent Claim
227 words
An evacuation system for a pump and inlet pipe system employed to pump diverse fluids from diverse sources and including in combination a pump, an inlet pipe system communicated with diverse sources of diverse fluids, valve means for selectively interrupting communication of the inlet pipe system with the source of fluids, and a vacuum relief valve means communicated with the inlet side of the pump and inlet pipe system for admitting air into the pump and inlet pipe system when the pump is operated with the communication with the source of fluids interrupted thereby enabling the pump to purge itself and the inlet pipe system of a fluid just pumped prior to communication of the pump and inlet pipe system with a different fluid thereby enabling the pump to operate as a low pressure air blower when purging itself and the inlet pipe system, said vacuum relief valve means being in the form of a ball check valve, spring means urging said check valve into closed position to prevent leakage of fluid during normal pumping operation and retaining the ball check valve in closed position until the pump induces a vacuum in the pump and inlet pipe system when communication with the fluid source is interrupted thus eliminating spillage of fuel and premature opening of the relief valve thereby eliminating the possibility of the pump losing vacuum.
Claim 3
Dependent Claim
71 words
The system as defined in claim 1, wherein said pump includes a discharge conduit and nozzle thereon with the nozzle being insertable back into communication with the source of fluid pumped by the pump so that the discharge conduit and nozzle may be purged when the pump acts as a low pressure air blower thereby returning all of the fluid to its source, said source of fluid including multiple liquid compartments.
Claim 4
Dependent Claim
31 words
The system as defined in claim 2, wherein said compartments receive fuel of different characteristics with the compartments being mounted on a delivery vehicle delivering different fuels to different delivery points.
Claim 5
Dependent Claim
53 words
A system as defined in claim 1, wherein said pump operates as a pump normally operates when there is fluid available for pumping and said pump operates as a low pressure blower when the vacuum relief valve opens permitting air to enter the pump when communication with the source of fluids is interrupted.
Claim 6
Independent Claim
100 words
The method of pumping fluid by employing a pump having an intake system and discharge conduit system consisting of the steps of pumping fluid with the pump until fluid is no longer available, air into the intake system of the pump while it is opErating for purging the pump and associated intake system and discharge conduit system of fluid with the pump acting as a low pressure blower, together with the step of communicating the discharge conduit system with fluid supply when admitting air for purging fluid from the pump, intake system and discharge conduit system into the fluid supply.
Claim 7
Independent Claim
100 words
The method of pumping fluid by employing a pump having an intake system and discharge conduit system consisting of the steps of pumping fluid with the pump until fluid is no longer available, air into the intake system of the pump while it is opErating for purging the pump and associated intake system and discharge conduit system of fluid with the pump acting as a low pressure blower, together with the step of communicating the discharge conduit system with fluid supply when admitting air for purging fluid from the pump, intake system and discharge conduit system into the fluid supply.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |