EP0969212A3 - Back pressure check valve - Google Patents
Back pressure check valve Download PDFInfo
- Publication number
- EP0969212A3 EP0969212A3 EP99110208A EP99110208A EP0969212A3 EP 0969212 A3 EP0969212 A3 EP 0969212A3 EP 99110208 A EP99110208 A EP 99110208A EP 99110208 A EP99110208 A EP 99110208A EP 0969212 A3 EP0969212 A3 EP 0969212A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- connection
- check valve
- back pressure
- pilot
- blocking element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Check Valves (AREA)
Abstract
Die vorliegende Erfindung betrifft ein hydraulisch mittels eines Pilotkolbens (40) entsperrbares Rückschlagventil mit einem ersten Anschluß (10), einem auf einem Sitz (20) dichtenden Sperrelement (30) und einem in Sperrichtung dahinter angeordneten zweiten Anschluß (12), wobei der Pilotkolben (40) über einen Pilotdruck-Anschluß (14) bewegbar ist und das Sperrelement (30) von seinem Sitz (20) abhebt, wobei am Pilotkolben (40) ein einen Druckabfall an einer Querschnittsverengung (22) bewirkender, mittels einer Kraft relativ zum Pilotkolben (40) bewegbarer Zwischenkolben (42) vorgesehen ist und wobei die Querschnittsverengung (22) in der Leitung zwischen dem Sperrelement (30) und dem zweiten Anschluß (12) angeordnet ist. The invention relates to a check valve that can be hydraulically unlocked by means of a pilot piston (40), with a first connection (10), a blocking element (30) sealing on a seat (20) and a second connection (12) arranged behind in the blocking direction, the pilot piston ( 40) can be moved via a pilot pressure connection (14) and the blocking element (30) lifts from its seat (20), a pressure drop at a cross-sectional constriction (22) on the pilot piston (40) causing a pressure drop relative to the pilot piston () 40) movable intermediate piston (42) is provided and the cross-sectional constriction (22) is arranged in the line between the blocking element (30) and the second connection (12).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19829232 | 1998-06-30 | ||
DE1998129232 DE19829232C1 (en) | 1998-06-30 | 1998-06-30 | Bias check valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0969212A2 EP0969212A2 (en) | 2000-01-05 |
EP0969212A3 true EP0969212A3 (en) | 2000-04-05 |
Family
ID=7872538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99110208A Withdrawn EP0969212A3 (en) | 1998-06-30 | 1999-05-26 | Back pressure check valve |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0969212A3 (en) |
DE (1) | DE19829232C1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2991759A (en) * | 1960-05-17 | 1961-07-11 | John S Pilch | Cushioning and flow control valve |
US3272086A (en) * | 1965-03-02 | 1966-09-13 | Holley Carburetor Co | Reversible self-locking hydraulic system |
US3857404A (en) * | 1973-04-30 | 1974-12-31 | Caterpillar Tractor Co | Hydraulically operated lock valve assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2946765C2 (en) * | 1979-11-20 | 1986-04-30 | Thyssen Industrie Ag, 4300 Essen | Releasable check valve |
DE3104362A1 (en) * | 1981-02-07 | 1982-08-19 | Gewerkschaft Eisenhütte Westfalia, 4670 Lünen | Hydraulically releasable non-return valve for hydraulic high-pressure systems, in particular for hydraulic support systems in underground mining operations |
DE19643041A1 (en) * | 1996-10-18 | 1998-04-23 | Fluid Team Automationstechnik | Fluid check valve for parallel hydraulic flow-passages |
-
1998
- 1998-06-30 DE DE1998129232 patent/DE19829232C1/en not_active Expired - Fee Related
-
1999
- 1999-05-26 EP EP99110208A patent/EP0969212A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2991759A (en) * | 1960-05-17 | 1961-07-11 | John S Pilch | Cushioning and flow control valve |
US3272086A (en) * | 1965-03-02 | 1966-09-13 | Holley Carburetor Co | Reversible self-locking hydraulic system |
US3857404A (en) * | 1973-04-30 | 1974-12-31 | Caterpillar Tractor Co | Hydraulically operated lock valve assembly |
Also Published As
Publication number | Publication date |
---|---|
DE19829232C1 (en) | 2000-05-18 |
EP0969212A2 (en) | 2000-01-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20000530 |
|
AKX | Designation fees paid |
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|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20011201 |