Steuerventil für eine Gegenschlag-Stichloch-Bohrmaschine.

摘要

In a control valve for a counter-blow tapping-hole drill, in particular a pneumatic striking mechanism for the driving, combined with a counter-blow mechanism (7) as a withdrawal device as well as a rotator (8) for a drilling or striking rod (5), consisting of control spools (15) which direct the main air to the consuming device and direct it back as exhaust air, in the course of which rapid venting is additionally provided which quickly reduces the pressure of the exhaust air, the axially movable control spool (15), which is provided with a valve disc (16) and can shut off the main air, has at its distal end a control piston (20) movable between housing (12) and shaft of the control spool (15), in which arrangement an annular piston (18) in addition bears alternately in a sealing manner between valve seat (19) and sealing seat (29) on the control piston (20). ……