Patent US3756281A successfully refreshed from Google Patents.
US3756281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency hand pump connection for hydraulically operated valves
Assignee: MMC International Corp
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Filing: 1971-12-27
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Granted: 1973-09-04
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Expires: 1991-12-27
Abstract
Abstract The building of large super tankers for the transportation of liquid cargoes has made it necessary to use hydraulically operated valves to handle the cargo. Hydraulic oil, under pressure, needed to power the valves, is run to each valve using small diameter piping. In times of emergency, when the hydraulic tubing is damaged, a portable hand pump, complete with its oil reservoir, is provided. The pump is carried as close to the hydraulically operated valve as possible and suitable connections must be made to direct the hydraulic oil pressure generated in the emergency hand pump to the valve actuator. A fitting or connection is disclosed herein by means of which the hand pump can be connected to the desired hydraulically operated valve, and which automatically shuts off at least the up-stream side of the hydraulic line so that the hand pump now can manually operate the valve independently of the damaged hydraulic pressure system, until repairs can be made.
Inventors
- 👤 W Gravert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:25
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/056; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86879
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
303 words
A. An emeregency fitting for a hydraulic pressure system, for enabling a valve actuator in the system to be operated manually by a local source of hydraulic pressure such as an emergency hand pump, b. said fitting having a normally open first fluid passageway between the normal source of hydraulic pressure and said valve actuator, c. said fitting having a second passageway between said first passageway and an external threaded pipe coupling, d. a movable valve normally biased to rest against a valve seat and closing the other end of said second passageway to prevent the passage of fluid from the hydraulic pressure system to said second passageway, e. an emergency probe having a third fluid passageway extending longitudinally thereof and having a fitting at one end of said passageway for connection to an emergency hand pump, said probe being of a size to fit into said second passageway, f. a threaded element mounted on said probe and engagable with said external pipe fitting when said probe is fitted into said second passageway so that the end of the probe engages said movable valve to move it from its seat to open the end of the second passageway to provide fluid access to said first passageway, g. said threaded element being sufficiently long so that further threading engagement thereof on said external pipe fitting causes said valve to close the first passageway to said normal source of hydraulic pressure, whereby said third passageway is connected to said valve actuator and said normal source of hydraulic pressure is closed off, h. and an alternate probe similar to said emergency probe but sufficiently shorter in length so that it opens the end of the second passageway but does not close the first passageway to the normal source of pressure, so that all passageways are interconnected.
Claim 2
Dependent Claim
303 words
A. An emeregency fitting for a hydraulic pressure system, for enabling a valve actuator in the system to be operated manually by a local source of hydraulic pressure such as an emergency hand pump, b. said fitting having a normally open first fluid passageway between the normal source of hydraulic pressure and said valve actuator, c. said fitting having a second passageway between said first passageway and an external threaded pipe coupling, d. a movable valve normally biased to rest against a valve seat and closing the other end of said second passageway to prevent the passage of fluid from the hydraulic pressure system to said second passageway, e. an emergency probe having a third fluid passageway extending longitudinally thereof and having a fitting at one end of said passageway for connection to an emergency hand pump, said probe being of a size to fit into said second passageway, f. a threaded element mounted on said probe and engagable with said external pipe fitting when said probe is fitted into said second passageway so that the end of the probe engages said movable valve to move it from its seat to open the end of the second passageway to provide fluid access to said first passageway, g. said threaded element being sufficiently long so that further threading engagement thereof on said external pipe fitting causes said valve to close the first passageway to said normal source of hydraulic pressure, whereby said third passageway is connected to said valve actuator and said normal source of hydraulic pressure is closed off, h. and an alternate probe similar to said emergency probe but sufficiently shorter in length so that it opens the end of the second passageway but does not close the first passageway to the normal source of pressure, so that all passageways are interconnected.
Claim 3
Dependent Claim
324 words
a. An emergency fitting for a hydraulic pressure system, for enabling a valve actuator in the system to be operated manually by a local source of hydraulic pressure such as an emergency hand pump, b. said fitting having a normally open first fluid passageway between the normal source of hydraulic pressure and said valve actuator, c. said ftting having a second passageway between said first passageway and an external threaded pipe coupling, d. a ball valve movable along said first passageway and normally spring-biased in a first position to rest against a valve seat to close the end of said second passageway where it joins the first passageway to prevent the passage of fluid from the hydraulic pressure system to said second passageway, e. an emergency probe having a third fluid passageway extending longitudinally thereof and having a fitting at one end of said passageway for connection to an emergency hand pump, said probe being of a size to fit into said second passageway, f. a threaded element mounted on said probe and engagable with said external pipe fitting when said probe is fitted into said second passageway so that the end of the probe engages said ball valve to move it from its seat to open the end of the second passageway to provide fluid access to said first passageway, g. and a second valve seat in said first passageway closable by said ball valve in a second position of said ball valve to close said first passageway from said normal source of hydraulic pressure, h. said threaded element being sufficiently long so that on further threaded engagement thereof on said external pipe fitting said probe moves said ball valve against its spring bias into engagement with said second valve seat to close the first passageway to said normal source of hydraulic pressure, whereby said third passageway is connected to said valve actuator and said normal source of hydraulic pressure is closed off.
Claim 4
Dependent Claim
324 words
a. An emergency fitting for a hydraulic pressure system, for enabling a valve actuator in the system to be operated manually by a local source of hydraulic pressure such as an emergency hand pump, b. said fitting having a normally open first fluid passageway between the normal source of hydraulic pressure and said valve actuator, c. said ftting having a second passageway between said first passageway and an external threaded pipe coupling, d. a ball valve movable along said first passageway and normally spring-biased in a first position to rest against a valve seat to close the end of said second passageway where it joins the first passageway to prevent the passage of fluid from the hydraulic pressure system to said second passageway, e. an emergency probe having a third fluid passageway extending longitudinally thereof and having a fitting at one end of said passageway for connection to an emergency hand pump, said probe being of a size to fit into said second passageway, f. a threaded element mounted on said probe and engagable with said external pipe fitting when said probe is fitted into said second passageway so that the end of the probe engages said ball valve to move it from its seat to open the end of the second passageway to provide fluid access to said first passageway, g. and a second valve seat in said first passageway closable by said ball valve in a second position of said ball valve to close said first passageway from said normal source of hydraulic pressure, h. said threaded element being sufficiently long so that on further threaded engagement thereof on said external pipe fitting said probe moves said ball valve against its spring bias into engagement with said second valve seat to close the first passageway to said normal source of hydraulic pressure, whereby said third passageway is connected to said valve actuator and said normal source of hydraulic pressure is closed off.
References Cited (Backward Citations)
US3049148A
Cited
US3213884A
Cited
US3311130A
Cited
US3280834A
Cited
US3426799A
Cited
US3446245A
Cited
US3574314A
Cited
US3633618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |