US3593741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound relief valve
Assignee: Bosch Rexroth AG
•
Filing: 1969-07-14
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Granted: 1971-07-20
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Expires: 1989-07-14
Abstract
Abstract A compound relief valve wherein the pilot valve is installed in a branch conduit connecting the high-pressure line with the reservoir and wherein the chamber of the main valve is connected with the branch conduit upstream of the pilot valve by two auxiliary conduits each of which contains an adjustable flow restrictor. The piston of the main valve opens at a speed which is determined by one of the flow restrictors and closes at a speed which is determined by the other flow restrictor.
Inventors
- 👤 Hubert Odenthal
- 👤 Eckard Auditor
- 👤 Max-Otto Wintterlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:14
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/7781; Y10T137/7782
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A compound relief valve for regulating the flow of pressurized fluid from a high-pressure line to a reservoir, comprising a main valve including a seat, a chamber and a valve member movable in said chamber and normally engaging said seat to thereby seal the high-pressure line from the reservoir; a branch conduit connecting the high-pressure line with the reservoir; a normally closed pilot valve provided in said conduit to prevent the flow of fluid when the fluid pressure in the line remains below a predetermined value, a pair of auxiliary conduits each connecting said chamber with said branch conduit upstream of said pilot valve; flow restrictor means provided in each of said auxiliary conduits; and check valve means provided in each of said auxiliary conduits, one of said check valve means being arranged to permit and the other being arranged to prevent flow of fluid from said chamber.
Claim 2
Dependent Claim
148 words
A compound relief valve for regulating the flow of pressurized fluid from a high-pressure line to a reservoir, comprising a main valve including a seat, a chamber and a valve member movable in said chamber and normally engaging said seat to thereby seal the high-pressure line from the reservoir; a branch conduit connecting the high-pressure line with the reservoir; a normally closed pilot valve provided in said conduit to prevent the flow of fluid when the fluid pressure in the line remains below a predetermined value, a pair of auxiliary conduits each connecting said chamber with said branch conduit upstream of said pilot valve; flow restrictor means provided in each of said auxiliary conduits; and check valve means provided in each of said auxiliary conduits, one of said check valve means being arranged to permit and the other being arranged to prevent flow of fluid from said chamber.
Claim 3
Dependent Claim
29 words
A compound relief valve as defined in claim 1, wherein said branch conduit is free of flow-restricting means in the region between the high-pressure line and said pilot valve.
Claim 4
Dependent Claim
31 words
A compound relief valve as defined in claim 1, further comprising a normally closed auxiliary valve connecting the reservoir with said branch conduit between said pilot valve and said auxiliary conduits.
Claim 5
Dependent Claim
18 words
A compound relief valve as defined in claim 3, wherein said auxiliary valve is a two-way solenoid-operated valve.
Claim 6
Dependent Claim
40 words
A compound relief valve as defined in claim 1, further comprising remote control means connected with said branch conduit between said pilot valve and said auxiliary conduits to permit escape of fluid from said chamber independently of said pilot valve.
Claim 7
Dependent Claim
19 words
A compound relief valve as defined in claim 5, wherein said remote control means comprises a normally sealed conduit.
Claim 8
Dependent Claim
43 words
A compound relief valve is defined in claim 1, wherein each of said flow restrictor means is adjustable between a plurality of positions and wherein each thereof permits at least some fluid to flow through the respective auxiliary conduit in each position tHereof.
References Cited (Backward Citations)
US549224A
Cited
US795448A
Cited
US1719686A
Cited
DE723307C
Cited
US2417994A
Cited
US3180355A
Cited
US3225785A
Cited
US3282552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |