US3878864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bypass valve
Assignee: Borg Warner Corp
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Filing: 1973-12-07
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Granted: 1975-04-22
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Expires: 1993-12-07
Abstract
Abstract A differential pressure actuated bypass valve for use in a loadresponsive hydraulic system for controlling a fluid actuated device including at least one manual control valve wherein said bypass valve is adapted to bypass excess fluid at a low differential pressure when no fluid is being directed to a fluid motor. The bypass valve including valve means actuatable to adjust the bypass valve to bypass fluid at a higher differential pressure when a fluid motor is actuated to extend the flow capacity of the manual valve and to provide a connection between the pump and the fluid motor through the pilot or control circuit initially.
Inventors
- 👤 Joseph A Schurger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:20
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B11/00; F15B11/16; F15B11/161; F15B11/165; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/25; F15B2211/253; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/329; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50536; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/6055; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/71; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2635; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A differential pressure actuated bypass valve for use in a hydraulic control system having a control valve with pressure inlet, motor, and fluid return ports and a movable valving element; including a source of fluid supply connected to said inlet port, said control valve having a neutral position, a control circuit associated with said control valve and adapted to be connected to a motor port when said control valve is moved from its neutral position, said bypass valve being connected to said source of supply, said bypass valve being connected to said control circuit and adapted to be connected to said motor port through said control circuit whereby said bypass valve is operative to bypass fluid from said source to said sump as a function of the difference in fluid pressure between said inlet port and said motor port, said bypass valve having fluidresponsive valve means responsive to fluid pressure in said motor port, and said fluid responsive valve means having means providing a fluid connection between said source of supply and said motor port through said control circuit to initially overcome load resistance.
Claim 2
Dependent Claim
184 words
A differential pressure actuated bypass valve for use in a hydraulic control system having a control valve with pressure inlet, motor, and fluid return ports and a movable valving element; including a source of fluid supply connected to said inlet port, said control valve having a neutral position, a control circuit associated with said control valve and adapted to be connected to a motor port when said control valve is moved from its neutral position, said bypass valve being connected to said source of supply, said bypass valve being connected to said control circuit and adapted to be connected to said motor port through said control circuit whereby said bypass valve is operative to bypass fluid from said source to said sump as a function of the difference in fluid pressure between said inlet port and said motor port, said bypass valve having fluidresponsive valve means responsive to fluid pressure in said motor port, and said fluid responsive valve means having means providing a fluid connection between said source of supply and said motor port through said control circuit to initially overcome load resistance.
Claim 3
Dependent Claim
184 words
A differential pressure actuated bypass valve for use in a hydraulic control system having a control valve with pressure inlet, motor, and fluid return ports and a movable valving element; including a source of fluid supply connected to said inlet port, said control valve having a neutral position, a control circuit associated with said control valve and adapted to be connected to a motor port when said control valve is moved from its neutral position, said bypass valve being connected to said source of supply, said bypass valve being connected to said control circuit and adapted to be connected to said motor port through said control circuit whereby said bypass valve is operative to bypass fluid from said source to said sump as a function of the difference in fluid pressure between said inlet port and said motor port, said bypass valve having fluid-responsive valve means responsive to fluid pressure in said motor port, and said fluid responsive valve means having means providing a fluid connection between said source of supply and said motor port through said control circuit to initially overcome load resistance.
Claim 4
Dependent Claim
184 words
A differential pressure actuated bypass valve for use in a hydraulic control system having a control valve with pressure inlet, motor, and fluid return ports and a movable valving element; including a source of fluid supply connected to said inlet port, said control valve having a neutral position, a control circuit associated with said control valve and adapted to be connected to a motor port when said control valve is moved from its neutral position, said bypass valve being connected to said source of supply, said bypass valve being connected to said control circuit and adapted to be connected to said motor port through said control circuit whereby said bypass valve is operative to bypass fluid from said source to said sump as a function of the difference in fluid pressure between said inlet port and said motor port, said bypass valve having fluid-responsive valve means responsive to fluid pressure in said motor port, and said fluid responsive valve means having means providing a fluid connection between said source of supply and said motor port through said control circuit to initially overcome load resistance.
Claim 5
Dependent Claim
28 words
A bypass valve as claimed in claim 1 wherein said fluid responsive valve means has a fluid responsive area thereon exposed to fluid pressure in said control circuit.
Claim 6
Dependent Claim
27 words
A bypass valve as claimed in claim 1 said bypass valve including a valve spool and said fluid responsive valve means being mounted within said valve spool.
Claim 7
Dependent Claim
43 words
A bypass valve as claimed in claim 3 including bias means within said valve spool adapted to move said fluid responsive valve means to a position interrupting the connection between said source of fluid supply and said motor port through said control circuit.
Claim 8
Dependent Claim
29 words
A bypass valve as claimed in claim 4 including a one-way valve means adapted to prevent flow of fluid from said control circuit through said fluid responsive valve means.
Claim 9
Dependent Claim
29 words
A bypass valve as claimed in claim 1 wherein said control circuit includes logic means adapted to connect said circuit to the motor port having the highest pressure therein.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |