EP 0883753 B1 20020417 - LOAD-HOLDING BRAKE VALVE
Title (en)
LOAD-HOLDING BRAKE VALVE
Title (de)
LASTHALTE-BREMSVENTIL
Title (fr)
SOUPAPE DE FREIN A MAINTIEN DE CHARGE
Publication
Application
Priority
- DE 19607452 A 19960228
- DE 19649752 A 19961130
- EP 9700992 W 19970228
Abstract (en)
[origin: WO9732136A1] The invention relates to a hydraulically controlled valve for double-acting consumers, which discharges during the lowering mode in a throttled manner a load volume flow from connection B to connection A. To this end, the valve has a valve seat (5) which comes into contact with a sealing surface (4) of a main piston (3) in which a pilot piston (8) is guided concentrically which comes into contact with a sealing surface (7) of a pilot valve seat (7) in the main piston. Said main piston (3) and said pilot piston (8) are held by load pressure and/or by resilient force on the valve seat (5) or the pilot valve seat (6). The pilot piston (8) has on the pressure-relieved side a piston shank (9) extending in a seat bore and having a continuously decreasing throttling action, in particular throttle grooves (10) which form a throttling point. When hydraulically actuated the pilot piston (8) can be axially displaced by a control piston (20) with the result that the pilot valve (5, 6) opens and there is a load volume flow via the throttling point from a pilot chamber (15) accommodating the springs. The resultant decrease in load pressure causes axially displacement of the main piston (3) and opening of the valve seat. An additional damping valve arrangement reduces load oscillations which occur. A pressure-limiting-valve independent of the return pressure is incorporated in the load-holding brake-valve housing.
IPC 1-7
IPC 8 full level
F16K 17/06 (2006.01); F15B 11/00 (2006.01); F15B 11/08 (2006.01); F15B 13/01 (2006.01); F15B 13/00 (2006.01)
CPC (source: EP KR US)
F15B 13/015 (2013.01 - EP KR US); F15B 2013/008 (2013.01 - EP KR US); F15B 2211/405 (2013.01 - KR); Y10T 137/2544 (2015.04 - EP US)
Designated contracting state (EPC)
BE CH DE FR GB IT LI SE
DOCDB simple family (publication)
WO 9732136 A1 19970904; DE 59707059 D1 20020523; EP 0883753 A1 19981216; EP 0883753 B1 20020417; JP 2000505532 A 20000509; JP 3617841 B2 20050209; KR 19990087371 A 19991227; US 6098647 A 20000808
DOCDB simple family (application)
EP 9700992 W 19970228; DE 59707059 T 19970228; EP 97907055 A 19970228; JP 53062097 A 19970228; KR 19980706783 A 19980828; US 12597798 A 19980828