EP 1381779 A1 20040121 - DIRECTIONAL CONTROL VALVE COMPRISING AN INTERNAL PRESSURE REGULATOR
Title (en)
DIRECTIONAL CONTROL VALVE COMPRISING AN INTERNAL PRESSURE REGULATOR
Title (de)
WEGEVENTIL MIT INNENLIEGENDER DRUCKWAAGE
Title (fr)
TIROIR A BALANCE MANOMETRIQUE SITUEE A L'INTERIEUR
Publication
Application
Priority
- CH 6992001 A 20010417
- IB 0200759 W 20020313
Abstract (en)
[origin: WO02088550A1] The invention relates to a directional control valve comprising an internal pressure regulator. The pressure regulator piston (5) of the latter is configured as a hollow slide with a radial passage (31). According to the invention, the radial passage (31) is positioned in such a way that a connection from the internal chamber (7) of the pressure regulator piston (5) to a pump pressure annular channel (P) can be regulated by said radial passage (31) and a second radial passage (22) of a directional control valve piston (3). At the same time the second radial passage (22) constitutes a control edge, which is used to regulate the connection from the internal chamber (7) to the load sensing annular channel (LS). According to the invention, an annular groove (41), which in the neutral position forms a connection from the internal chamber (7) to the load sensing annular channel (LS), is joined to the second radial passage (22). The invention enables the pressure regulator to be impervious to different flow forces caused by different mass fluxes and ensures that the hydraulic consumer is prevented from moving in the neutral position.
IPC 1-7
IPC 8 full level
F15B 13/04 (2006.01)
CPC (source: EP US)
F15B 13/0418 (2013.01 - EP US); Y10T 137/86702 (2015.04 - EP US); Y10T 137/87169 (2015.04 - EP US)
Citation (search report)
See references of WO 02088550A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 02088550 A1 20021107; AT E326636 T1 20060615; DE 50206817 D1 20060622; EP 1381779 A1 20040121; EP 1381779 B1 20060517; US 2004094210 A1 20040520; US 6860291 B2 20050301
DOCDB simple family (application)
IB 0200759 W 20020313; AT 02727817 T 20020313; DE 50206817 T 20020313; EP 02727817 A 20020313; US 47440203 A 20031009