EP0969212A3 - Back pressure check valve - Google Patents

Back pressure check valve Download PDF

Info

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Withdrawn
Application number
EP99110208A
Other languages
German (de)
French (fr)
Other versions
EP0969212A2 (en
Inventor
Herbert Burk
Peter Ebert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber Hydraulik GmbH Germany
Original Assignee
Weber Hydraulik GmbH Germany
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weber Hydraulik GmbH Germany filed Critical Weber Hydraulik GmbH Germany
Publication of EP0969212A2 publication Critical patent/EP0969212A2/en
Publication of EP0969212A3 publication Critical patent/EP0969212A3/en
Withdrawn legal-status Critical Current

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.

Figure 00000001
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).
Figure 00000001
EP99110208A 1998-06-30 1999-05-26 Back pressure check valve Withdrawn EP0969212A3 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
DE2946765C2 (en) Releasable check valve
EP1111230A3 (en) Hydraulic device for transmitting an actuator movement
DE3921292C2 (en)
DE19915532B4 (en) Switchable valve drive member
DE2104039A1 (en) Hydraulic slide
DE10023981A1 (en) Piezoelectric valve for hydraulic control system of machine, has spring compressed to allow flow of fluid through second passage and second chamber in order to form second flow path
DE2616251C2 (en) Pressure relief and suction valve
DE411808T1 (en) LOGIC VALVE.
DE3245166C2 (en) Annular breakout preventer and packing therefor
EP0969212A3 (en) Back pressure check valve
EP0331813A1 (en) Device for fixing a separating lamina
DE2303824C3 (en) Fuel injection pump for internal combustion engines
DE2244580C3 (en) Rotary means operated rotary drive
DE3637345C2 (en)
DE3026792C2 (en)
DE3206870C2 (en) Multi-stage hydraulic telescopic cylinder with pressure medium supply on the end piston side
DE3048229C2 (en) Check valve for pit lining stamps
DE3402110C2 (en)
DE69004029T2 (en) Control valve device for pressure oil.
DE753835C (en) Two-stage liquid pressure generator
DE2123263A1 (en) Hydraulic press cylinder with fast forward and fast return
DE1601984A1 (en) OE single injection device
EP0089578B1 (en) Hydraulic system
DE2719848A1 (en) Hydraulic multistage telescopic cylinder - has two non-return valves which are spring loaded and have control pistons
DE102017100190B4 (en) Hydraulic steering arrangement

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR IT NL SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20000530

AKX Designation fees paid

Free format text: DE FR IT NL SE

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