SHUT-OFF UNIT OF VALVE Russian patent published in 1997 - IPC

FIELD: manufacture of fittings; systems of high-vacuum and cryogenic engineering. SUBSTANCE: shut-off unit of valve has housing with sealing edge of seat hole and shut-off member with tail-piece movably arranged in housing along axis. It is set in motion by means of power drive and is engageable with sealing edge of seat. Shut-off member is made in form of circular flexible member connected with tail-piece. This member has toroidal sealing surface. It is deformed under action of axial force repeating the form of sealing edge of seal hole and forming cavity together with tail-piece whose open side is directed to sealing edge of seat hole. EFFECT: enhanced reliability. 3 cl, 6 dwg