US4896694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-limiting valve
Assignee: Bosch Rexroth AG
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Filing: 1989-03-16
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Granted: 1990-01-30
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Expires: 2009-03-16
Abstract
Abstract To reduce the noise on response of a pressure-limiting valve, downstream of the valve seat an annular space, an annular gap and a further annular space are provided. This flow-off system gives a reduction of the noise level. Moreover, in pressureless circulation the flow resistance of the valve is low because the annular gap is freed by the piston.
Inventors
- 👤 Georg Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:58
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; F16K47/00; F16K47/02; F16K47/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/7769; Y10T137/777
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A pressure-limiting valve comprising: a valve housing, a valve body within said valve housing, said body pressed by a valve force against fluid pressure onto a valve seat and movable from engagement with said valve seat to permit fluid flow across said valve seat when fluid pressure exceeds the valve force, a fluid passageway formed between said valve body and said valve housing downstream of said valve seat, said passageway comprising a first recess in said valve housing proximal said valve seat defining a first annular space between said valve body and housing, a second recess in said valve housing distal said valve seat defining a second annular space between said valve body and housing, and a throttle point between said first and second recesses, defining a third annular space between said valve body and housing wherein said second annular space has a volume greater than said first annular space, and said first annular space has a volume substantially greater than said third annular space.
Claim 2
Dependent Claim
165 words
A pressure-limiting valve comprising: a valve housing, a valve body within said valve housing, said body pressed by a valve force against fluid pressure onto a valve seat and movable from engagement with said valve seat to permit fluid flow across said valve seat when fluid pressure exceeds the valve force, a fluid passageway formed between said valve body and said valve housing downstream of said valve seat, said passageway comprising a first recess in said valve housing proximal said valve seat defining a first annular space between said valve body and housing, a second recess in said valve housing distal said valve seat defining a second annular space between said valve body and housing, and a throttle point between said first and second recesses, defining a third annular space between said valve body and housing wherein said second annular space has a volume greater than said first annular space, and said first annular space has a volume substantially greater than said third annular space.
Claim 3
Dependent Claim
45 words
Pressure-limiting valve according to claim 1, characterized in that the throttle point is arranged at a point within the range of the stoke of the valve body, and in the fully open position of the valve body the resistance of the throttle point is cancelled.
Claim 4
Dependent Claim
15 words
Pressure-limiting valve according to claim 1, characterized in that the valve body is a piston.
Claim 5
Dependent Claim
14 words
Pressure-limiting valve according to claim 1, characterized in that the pressure-limiting valve is pilot-controlled.
Claim 6
Dependent Claim
15 words
Pressure-limiting valve according to claim 2, characterized in that the valve body is a piston.
Claim 7
Dependent Claim
15 words
Pressure-limiting valve according to claim 4, characterized in that the valve body is a piston.
Claim 8
Dependent Claim
41 words
Pressure-limiting valve according to claim 6 further comprising an open axial bore through said piston having a constriction therein enabling fluid communication between said pilot downstream of said valve seat and a chamber under fluid pressure upstream of said valve seat.
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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |