BALL COCK Russian patent published in 1994 - IPC

FIELD: fittings. SUBSTANCE: plug is made in form of intersecting through-way and base pipes. Located in each end of base pipe for limited axial displacement is actuating chamber which receives plate, actuating diaphragm whose end rests against through-way pipe and spool valve with center back projection and axial hole. Spool valve is engageable with seats and plates. Spring member is located in clearance between spool valve and plate. Interiors of base pipe, housing and circular clearance are brought in communication forming part of bypass passage. Mounting surfaces of seats and spool valves are made in form of taper whose generatrix is perpendicular to radius from center of plug to center of generatrix. Located on housing is control hydraulic chamber bounded by control diaphragm and connected with both actuating hydraulic chambers by means of flexible pipe line. Diaphragm is mounted for engagement with one end of sleeve provided with two tappets oriented oppositely. EFFECT: enhanced reliability. 7 dwg