COCK Russian patent published in 1995 - IPC

FIELD: valving. SUBSTANCE: seat provided with diametrically opposite ports, which are overlapped with a cutting-off member, is positioned within a housing having inlet and outlet branch pipes. The member is constructed as rotatable gates, which are coupled with a rotatable unit and loaded by a spring in the direction of seat. The seat has an outer conical groove in the middle part. The rotatable unit is constructed as a rotatable bushing. The bushing is tightly mounted on the housing outside of the rotatable gates. The gates have conical cross- section and are received in the groove. EFFECT: enhanced reliability. 3 dwg