DIGITAL INDIRECT-ACTION ELECTRICALLY CONTROLLED SAFETY VALVE Russian patent published in 2014 - IPC F16K17/04 

FIELD: machine building.

SUBSTANCE: digital indirect-action electrically controlled safety valve comprises a basic cascade with a casing with supply, drain and control lines being provided in the latter, with a shell and a spring-loaded plunger with a jet nozzle. A pressure sensor is connected to the supply line. The said digital safety valve comprises a control cascade with a driving step electric motor with a double-ended shaft, basic screw gear with left-hand thread, spring and gate interacting with the axial bore of an adjusting screw. An additional screw gear with right-hand thread is installed at the rear shaft of the step electric motor. The said gear consists of a lead screw and a nut whose slipping is prevented due to a housing fastening post passing through its groove. At the end of a stroke the nut end face affects a microswitch via a spring-loaded lever. The lead screw is fitted by end face teeth pressed against a carrier pin by the screw with the pin being pressed into the rear shaft of the step electric motor.

EFFECT: higher operation reliability.

1 dwg