CUT-OFF VALVE Russian patent published in 2006 - IPC F16K17/04 F16K15/03 

FIELD: valving.

SUBSTANCE: cut-off valve comprises two housings with interconnected spaces. The first housing receives seat and gate movably mounted on the seat, and the second housing receives a mechanism for rotating and lifting the gate. The mechanism has movable bushing provided with the axle. One end of the lever is connected with the gate. The locator of position of the gate is made of electromagnet whose core is interposed between the lever and bushing. The core and bushing are made for permitting them to be connected when the gate is at the bottom position and to be disconnected when the gate is at the top position. The bushing is provided with the tip having split spring ring that is set in the ring groove provided in the tip, and core has the space for receiving the tip and groove with L-shaped cross-section for receiving the spring ring of the tip. The cut-off valve is additionally provided with the control unit and block for control of position of the gate. The control unit and the block for control of the position of the gate comprises light diodes, sealed-contact reed relays, and relay. The sealed-contact reed relays are mounted for permitting them to be controlled by electromagnetic field of the coil. The block for control of gate position has additional axles parallel to the axle of the mechanism for rotation and lifting and connected with it by means of a gear transmission and nut with the permanent magnet that can move with respect to the additional axle. The sealed-contact reed relay, light diodes, and control unit are connected with the power source through the relay and outputs for connection of transducers. From the side of the outlet, the housing of the mechanism for rotating and lifting is provided with lid having projecting outer part, and the axis of the control unit and block for control of the position of the gate passes through projecting part of the lid. The core and tip are provided with passages for leveling pressure.

EFFECT: enhanced reliability.