HYDRAULIC CONTROL VALVE OF POWERED SUPPORT Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: hydraulic control valve of powered support includes body with parallel valves located inside it. Each valve has distributing member with control part and valve member seat located on the side of discharge and return channels, bushing accommodating pusher, and handle mounted on body and having locking member for holding halves. Pusher is made in form of two-stage plunger with sealing by stages of large and small diameters and bushing. Lower end-face surface of plunger is made in form of additional seat and connected with hollow through channel made in plunger. Locking member has spring in its lower part and button in its upper part and located inside handle for interaction with recess of neighboring valve between bushing and body for locking handle in working position of one valve. EFFECT: higher efficiency. 1 dwg