Patent US4246934A successfully refreshed from Google Patents.
US4246934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remotely controlled load responsive valves
Assignee: Individual
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Filing: 1979-06-28
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Granted: 1981-01-27
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Expires: 1999-06-28
Abstract
Abstract In a fluid throttling pressure compensated valve remote control of position of valve spool in which the total force acting on the spool is directly proportional to displacement of the spool from its neutral position, irrespective of the pressure differential between the pump pressure and the load pressure or the pressure differential between the load pressure and the reservoir pressure.
Inventors
- 👤 Tadeusz Budzich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:07
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/161; F15B11/165; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20507; F15B2211/20523; F15B2211/2053; F15B2211/20538; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/253; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/3144; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/329; F15B2211/50; F15B2211/515; F15B2211/5151; F15B2211/57; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6052; F15B2211/6055; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/71; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
235 words
A valve assembly comprising a housing having a supply chamber communicable with a pump, first and second load chambers, and fluid exhaust means, first valve means for selectively interconnecting said load chambers with said supply chamber and said fluid exhaust means, fluid metering means on said first valve means, positive load flow force limiting means of said first valve means including positive load control means to limit pressure differential acting across said metering orifice means to a predetermined relatively constant level when said supply chamber is connected to one of said load chambers and said load chamber is pressurized, negative load flow force limiting means of said first valve means including negative load control means having throttling means to limit pressure differential across said metering orifice means to a predetermined relatively constant level when one of said load chambers is connected to said exhaust means and said load chamber is pressurized, spring biasing means to bias said first valve means in direction to reduce effective flow area of said metering orifice means, actuating means on said first valve means having force generating means responsive to a control signal and control signal generating means operable to transmit control signal to said force generating means of said actuating means, whereby said first valve means will assume a flow control position proportional to said control signal and independent of the magnitude of said positive and said negative loads.
Claim 2
Dependent Claim
235 words
A valve assembly comprising a housing having a supply chamber communicable with a pump, first and second load chambers, and fluid exhaust means, first valve means for selectively interconnecting said load chambers with said supply chamber and said fluid exhaust means, fluid metering means on said first valve means, positive load flow force limiting means of said first valve means including positive load control means to limit pressure differential acting across said metering orifice means to a predetermined relatively constant level when said supply chamber is connected to one of said load chambers and said load chamber is pressurized, negative load flow force limiting means of said first valve means including negative load control means having throttling means to limit pressure differential across said metering orifice means to a predetermined relatively constant level when one of said load chambers is connected to said exhaust means and said load chamber is pressurized, spring biasing means to bias said first valve means in direction to reduce effective flow area of said metering orifice means, actuating means on said first valve means having force generating means responsive to a control signal and control signal generating means operable to transmit control signal to said force generating means of said actuating means, whereby said first valve means will assume a flow control position proportional to said control signal and independent of the magnitude of said positive and said negative loads.
Claim 3
Dependent Claim
51 words
A valve assembly as set forth in claim 1 wherein said housing has positive load sensing means selectively communicable with said load chambers by said first valve means and operable to transmit load pressure signal to said pump, said pump having output flow control means responsive to said load pressure signal.
Claim 4
Dependent Claim
27 words
A valve assembly as set forth in claim 2 wherein said output flow control means includes a bypass means having means responsive to said load pressure signal.
Claim 5
Dependent Claim
29 words
A valve assembly as set forth in claim 2 wherein said output flow control means includes a pump displacement changing means having means responsive to said load pressure signal.
Claim 6
Dependent Claim
19 words
A valve assembly as set forth in claim 1 wherein said positive load control means has fluid throttling means.
Claim 7
Dependent Claim
23 words
A valve assembly as set forth in claim 1 wherein said positive load control means includes output flow control means of said pump.
Claim 8
Dependent Claim
37 words
A valve assembly as set forth in claim 1 wherein said control signal generating means includes means to convert electrical control signal into proportional pressure signal and said force generating means includes means responsive to fluid pressure.
Claim 9
Dependent Claim
37 words
A valve assembly as set forth in claim 1 wherein said control signal generating means includes means to convert mechanical signal into fluid pressure and flow and said force generating means includes means responsive to fluid pressure.
Claim 10
Dependent Claim
40 words
A valve assembly as set forth in claim 1 wherein said control signal generating means includes means to generate an electrical signal and said force generating means includes transducer means operable to convert said electrical signal into mechanical force signal.
Claim 11
Dependent Claim
31 words
A valve assembly as set forth in claim 1 wherein said metering orifice means includes means operable to vary area of fluid flow proportionally to displacement of said first valve means.
Claim 12
Dependent Claim
40 words
A valve assembly as set forth in claim 1 wherein said spring biasing means has means operable to bias said first valve means into an isolating position to isolate said load chambers from said supply chamber and said exhaust means.
References Cited (Backward Citations)
US3998134A
Cited
US4058139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |