HYDRAULIC DISTRIBUTION FOR CONTROL OF HYDRAULIC CYLINDER Russian patent published in 1996 - IPC

FIELD: hydraulics. SUBSTANCE: housing has bores with pressure, return and working passages; return and pressure hydraulic locks connect hydraulic cylinder chamber in turn to return and pressure passages. Return hydraulic lock has pusher connected with drive and bush with radial holes engageable with pusher and movable in axial direction; bush is sealed over outer diameter. It is used for opening and closing the pressure and return passages in turn. Pressure hydraulic lock has guide for bush made in form of fixed holder with seat and spring-loaded shut-off member engageable with seat; shut-off member has tail-piece sealed over outer diameter and through-way passage for communication of working passage with pressure and return passages through hole in bush. Pusher of return hydraulic lock is provided with cup-shaped head at the end directed to bush. Cup-shaped head has through passage for flow of liquid to its rear side and sealing member mounted inside it and engageable with bush. Shut-off member of pressure hydraulic lock is provided with cup-shaped head engageable with seal over outer side of holder seat. EFFECT: enhanced reliability. 5 cl, 2 dwg