EP 0051728 B1 19850619 - HYDRAULIC MOTOR CONTROL SYSTEM
Title (en)
HYDRAULIC MOTOR CONTROL SYSTEM
Publication
Application
Priority
DE 3042277 A 19801108
Abstract (en)
[origin: EP0051728A1] 1. Control device for a hydraulic working cylinder (13), having a directional control valve (12), arranged downstream from a pressure medium source (10), and a countertorque shut-off valve (14) arranged between the directional control valve (12) and the working cylinder, which countertorque shut-off valve (14) has an unlocking piston (27) which is mounted in a sliding manner in a housing (22) and interacts with a relief control valve (46 and 60) arranged in a shut-off valve body (30 and 70), which relief control valve (46 and 60), at a tapered shoulder (49) of its closure part (48) and by the force of a spring (44), sits against a valve seat (50) formed in the shut-off valve body (30 and 70), and the shut-off valve body likewise sits against a valve seat (32) formed in the housing (22), with the relief control valve (46 and 60) having a control pin (53 and 53') which is separated from the closure part (48) by an annular groove (52), slides in a discharge bore (36) surrounded by the valve seat (50) of the shut-off valve body (30 and 70) and has a cylindrical guide section (53') guided in the relief bore (36) and a fine control pin (53), and with a pistonlike part (47) being formed on the relief control valve (46 and 60), which piston-like part (47), when the relief control valve is lifted from its seat (50), displaces pressure medium out of a damping space (42) via a throttle (58), and pressure medium is discharged out of the working cylinder (13) via the relief control valve (46 and 60) only when the cylindrical guide section (53') of the control pin emerges out of the discharge bore (36), characterised in that the fine control pin (53) has a tapered design, that the piston-like (47) of the relief control valve (46 and 60) is guided in a sliding manner in a bore (34) of the shut-off valve body (30 and 70) and that the throttle portion (58) is formed on the piston-like part (47) and interacts with the bore (34) of the shut-off valve body (30 and 70) in such a way that pressure medium is discharged out of the damping space (42) first of all essentially without being throttled and, after a slight displacement of the relief control valve (46 and 60), is discharged while being throttled.
IPC 1-7
IPC 8 full level
F16K 17/04 (2006.01); F15B 11/02 (2006.01); F15B 13/01 (2006.01)
CPC (source: EP)
F15B 13/015 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0051728 A1 19820519; EP 0051728 B1 19850619; DE 3042277 A1 19820603; DE 3171037 D1 19850725; JP S57107402 A 19820703
DOCDB simple family (application)
EP 81107401 A 19810918; DE 3042277 A 19801108; DE 3171037 T 19810918; JP 17730781 A 19811106