US4089346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load responsive fluid control valves
Assignee: Individual
•
Filing: 1976-12-13
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Granted: 1978-05-16
•
Expires: 1996-12-13
Abstract
Abstract A load responsive direction and flow control valve for use in a fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads in parallel or series type circuits, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve. When controlling positive or negative loads the valve maintains a constant pressure differential across a flow control metering orifice utilizing a single load responsive controller, first by throttling fluid entering the inlet chamber and then by throttling the fluid leaving the outlet chamber. The load responsive controller blocks the pump flow to the motor while controlling negative load, providing the motor inlet with fluid from the motor exhaust.
Inventors
- 👤 Tadeusz Budzich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:45
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185; Y10T137/87233
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
174 words
A valve assembly comprising a housing having a fluid inlet chamber connected to a source of fluid pressure, a fluid supply chamber, first and second load chambers, a fluid outlet chamber, and fluid exhaust means connected to reservoir means, first valve means for selectively interconnecting said fluid load chambers with said fluid supply chamber and said fluid outlet chamber, said first valve means having a variable orifice means between said fluid outlet chamber and said fluid exhaust means, load check valve means interconnecting for one way fluid flow said fluid supply chamber with said fluid inlet chamber, and second valve means having positive load throttling means and isolating means between said fluid inlet chamber and said fluid supply chamber, and fluid replenishing means between said fluid supply chamber and said fluid exhaust means, said second valve means having means responsive to pressure differential acting across said variable orifice means and operable to maintain said pressure differential at a first relatively constant pressure level while fluid is being throttled by said positive load throttling means.
Claim 2
Dependent Claim
174 words
A valve assembly comprising a housing having a fluid inlet chamber connected to a source of fluid pressure, a fluid supply chamber, first and second load chambers, a fluid outlet chamber, and fluid exhaust means connected to reservoir means, first valve means for selectively interconnecting said fluid load chambers with said fluid supply chamber and said fluid outlet chamber, said first valve means having a variable orifice means between said fluid outlet chamber and said fluid exhaust means, load check valve means interconnecting for one way fluid flow said fluid supply chamber with said fluid inlet chamber, and second valve means having positive load throttling means and isolating means between said fluid inlet chamber and said fluid supply chamber, and fluid replenishing means between said fluid supply chamber and said fluid exhaust means, said second valve means having means responsive to pressure differential acting across said variable orifice means and operable to maintain said pressure differential at a first relatively constant pressure level while fluid is being throttled by said positive load throttling means.
Claim 3
Dependent Claim
65 words
A valve assembly as set forth in claim 1 wherein said second valve means has negative load throttling means between said fluid outlet chamber and said fluid exhaust means, said means responsive to pressure differential acting across said variable orifice means operable to maintain said pressure differential at a second relatively constant pressure level while fluid is being throttled by said negative load throttling means.
Claim 4
Dependent Claim
51 words
A valve assembly as set forth in claim 1 wherein said housing has a fluid bypass chamber adjacent to said fluid inlet chamber, said second valve means having priority throttling means and bypass means operable to throttle or bypass fluid flow from said fluid inlet chamber to said fluid bypass chamber.
Claim 5
Dependent Claim
55 words
A valve assembly as set forth in claim 3 wherein said second valve means has bypass actuating means to open communication through said priority throttling and bypass means between said fluid inlet chamber and said fluid bypass chamber when said first valve means is in a neutral position and said variable orifice means remains closed.
Claim 6
Dependent Claim
54 words
A valve assembly as set forth in claim 4 wherein said bypass actuating means has positioning means of said second valve means to maintain full flow communication between said fluid inlet chamber and said fluid bypass chamber when said first valve means is in a neutral position and said variable orifice means remains closed.
Claim 7
Dependent Claim
30 words
A valve assembly as set forth in claim 1 wherein exhaust flow throttling means in said fluid exhaust means is interposed between said variable orifice means and said reservior means.
Claim 8
Dependent Claim
43 words
A valve assembly as set forth in claim 1 wherein said housing has a fluid flow chamber adjacent to said fluid supply chamber, said load check valve means interconnecting for one way fluid flow said fluid supply chamber and said fluid flow chamber.
Claim 9
Dependent Claim
29 words
A valve assembly as set forth in claim 1 wherein replenishing check valve means interconnect for one way fluid flow said fluid supply chamber and said fluid exhaust means.
Claim 10
Dependent Claim
34 words
A valve assembly as set forth in claim 1 wherein said means responsive to pressure differential acting across said variable orifice means has actuating means responsive to pressure upstream of said variable orifice means.
Claim 11
Dependent Claim
39 words
A valve assembly as set forth in claim 1 wherein said housing has a fluid exhaust chamber adjacent to said fluid outlet chamber, said variable orifice means being interposed between said fluid exhaust chamber and said fluid exhaust means.
Claim 12
Dependent Claim
42 words
A valve assembly as set forth in claim 1 wherein pressure signal port means selectively communicable with said first and second load chambers by said first valve means are operable to transmit a control pressure signal to said source of fluid pressure.
Claim 13
Dependent Claim
49 words
A valve assembly as set forth in claim 11 wherein pressure signal unloading means of pressure in said pressure signal port means is responsive to movement of said first valve means and operable to unload said signal pressure when said first valve means blocks said pressure signal port means.
Claim 14
Dependent Claim
110 words
A valve assembly as set forth in claim 1 wherein said housing has a fluid flow chamber adjacent to said fluid supply chamber and selectively communicable by said second valve means with said fluid inlet chamber, and a drain chamber adjacent to said fluid supply chamber and selectively communicable with said fluid supply chamber by said second valve means, said fluid supply chamber having a first and a second extension chamber, suction check valve means communicating for one way fluid flow said drain chamber and said first extension chamber and said load check valve means communicating for one way fluid flow said fluid flow chamber and said second extension chamber.
Claim 15
Dependent Claim
57 words
A valve assembly as set forth in claim 1 wherein said housing has a control chamber, fluid passage means to conduct fluid flow and pressure from upstream of said variable orifice means to said control chamber, flow restriction means in said fluid passage means, said second valve means being responsive to fluid pressure in said control chamber.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |