VALVE DEVICE FOR BORE ENGINE Russian patent published in 2004 - IPC

FIELD: well-boring equipment. SUBSTANCE: device has hollow body with radial accelerating passages, a cylinder inside the body with a saddle and radial accelerating passages, spring-loaded plunger, and annular compactors. Spring-loaded plunger has central inlet running passage, outlet running passage formed together with the body, radial accelerating passages, connected to cylinder's saddle, and radial running passages. Device also has a spring-loaded sliding valve in the plunger for moveable sealing of the central inlet running passage. Plunger has a saddle and additional radial running passages, connected to the sliding valve. EFFECT: lowered loss of flushing fluid, increased effectiveness of bore engine, increased reliability and durability of valve device for bore engine. 4 cl, 3 dwg