CUT-OFF VALVE Russian patent published in 2015 - IPC E21B34/02 F16K15/03 F16K37/00 

FIELD: oil and gas industry.

SUBSTANCE: cut-off valve comprises a body, inlet and outlet unions, setting mechanism consisting of spring-supported horizontal piston and vertical rod interacting by flat perpendicular-oriented stops, windup mechanism, a saddle and gate connected by a link rod to a vertical spring-supported rod. The body is equipped with spring-supported plunger placed perpendicular to its axis, a magnet at one of its ends and magnetic pickup, for example, normally-opened magnetic reed relay, a light-emitting diode and power supply source. Whereat the plunger is made so that by its one end it interacts with the gate at open cut-off valve and by its other end with magnet it interacts with the magnetic pickup at closed cut-off valve. At that the magnetic pickup is connected in series to the light-emitting diode and power supply source.

EFFECT: enhancing operation safety.

3 dwg