EP 1872018 A1 20080102 - PILOT VALVE FOR A HYDRAULIC MOTOR
Title (en)
PILOT VALVE FOR A HYDRAULIC MOTOR
Title (de)
STEUERVENTIL FÜR EINEN HYDROMOTOR
Title (fr)
SOUPAPE DE COMMANDE POUR UN MOTEUR HYDRAULIQUE
Publication
Application
Priority
- CH 2005000717 W 20051201
- CH 7072005 A 20050420
Abstract (en)
[origin: WO2006111031A1] The invention relates to a pilot valve (3) for a hydraulic motor which is used for lifting loads in a device. Said pilot valve (3) is designed as a directional control valve in which a control slide (20) is movably disposed in a longitudinal bore (22) of the valve body (21) so as to control the flow of hydraulic oil between two working connecting bores (A, B), a pump connecting bore (P), and a reservoir connecting bore (T). A check valve (32) which is biased with the aid of a bias spring (33) is disposed within the control slide (20). Said check valve (32) is connected to an auxiliary control groove (28) via a first transversal bore (29) while being connected to the B-reservoir groove (23) via a second transversal bore (31). The check valve (32) is to be opened from working connecting bore B while the auxiliary control groove (28) is arranged between the B control groove (24) and the B reservoir groove (23) and is delimited on both sides by means of sealing cylindrical areas (35, 36). The invention makes it possible to eliminate the given degree of irregularity d of the hydraulic motor when a load is lifted slowly.
IPC 8 full level
F15B 13/04 (2006.01)
CPC (source: EP US)
F15B 13/0402 (2013.01 - EP US); Y10T 137/86702 (2015.04 - EP US); Y10T 137/8671 (2015.04 - EP US)
Citation (search report)
See references of WO 2006111031A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006111031 A1 20061026; AT E403807 T1 20080815; DE 502005004981 D1 20080918; EP 1872018 A1 20080102; EP 1872018 B1 20080806; JP 2008537069 A 20080911; US 2009078112 A1 20090326; US 7921879 B2 20110412
DOCDB simple family (application)
CH 2005000717 W 20051201; AT 05804312 T 20051201; DE 502005004981 T 20051201; EP 05804312 A 20051201; JP 2008506896 A 20051201; US 91868805 A 20051201