CHECK VALVE Russian patent published in 2013 - IPC F16K15/03 F16K47/02 

FIELD: machine building.

SUBSTANCE: check valve comprises body representing body of revolution equipped with extra chamber to house lever and gate. Said body comprises valve seat that stays in contact with gate of tapered surface. Said gate has inner and outer surfaces. One end of said lever is hinged to gate outer convex surface in its axis of symmetry to constrict gate displacement relative to lever. Lever second end is fitted on axle inside the valve. Said axle is secured to valve body and coupled with nonlinear damper. The latter allows increasing moment of resistance to lever displacement to position approximating to boundary condition at valve closed state.

EFFECT: higher reliability, better tightness at high fluid pressures.

7 cl, 5 dwg