HYDRAULIC DISTRIBUTOR Russian patent published in 1999 - IPC

FIELD: hydraulic devices for control of hydraulic drives; hydraulic systems of tractors and other agricultural machines. SUBSTANCE: hydraulic distributor has housing with delivery, return and working chambers. Housing is provided with hollow spool valve with concentrically positioned centering spring and locking device which is provided with locking recesses for receiving the balls held in fixed position. Balls are engageable with surface of spring-loaded pressure member fitted coaxially relative to plunger. Plunger is provided with command chamber on side opposite to pressure member. Locking recesses are provided on inner surface of hollow spool valve. Located inside spool valve is cylindrical holder whose one end is secured on housing; radial holes of this holder are used for receiving the balls. Spring-loaded pressure member and plunger are located inside holder. Command chamber of plunger is connected with working chamber of hydraulic distributor through safety valve. EFFECT: reduction of loads; reduced overall dimensions for hydraulic distributor. 2 cl, 1 dwg