VALVE FOR VESSEL WITH EASILY FLAMMABLE LIQUID Russian patent published in 1996 - IPC

FIELD: petrochemical industry for pressure control. SUBSTANCE: the valve body is made as an elbow with sides of different length; located in the middle part of the elbow larger side is the working chamber with a curvilinear bottom; the chamber accommodates a cylindrical bush with an axle and shut-off member. The shut-off member is made as a double-acting blade. One end of the blade is rigidly attached to the cylindrical bush, the bush is installed for rotation on the axle secured in the upper part of the cylindrical bush is a spherical recess, whose outer surface is coated with a mirror error. Transmitter and receiver light guides are installed at a distance of the spherical recess radius from the mirror surface. The light guides are optically tied-in respectively one with the light source, the other - with the light receiver, electrically coupled to the power supply and signal processing units. EFFECT: enhanced reliability. 1 dwg