ROTARY CHECK VALVE (VERSIONS) Russian patent published in 2014 - IPC F16K15/03 F16K47/02 

FIELD: metallurgy.

SUBSTANCE: in compliance with first and second versions, check valve cylindrical body comprises piston-type working member engaged with valve shaft via "screw-nut" gearing. In compliance with first version, cylindrical body is composed by hydraulic cylinder including a set of variable- and constant-volume communicated chambers. At valve shaft turn and piston displacement in said cylinder said piston is braked by thick fluid flow in gaged channels communicating hydraulic cylinder chambers. In compliance with second version, said piston is braked by interaction between the latter and mechanical resilient and damping units. Device is adjusted owing to rotation of adjusting rolls.

EFFECT: higher efficiency of adjustment.

13 cl, 9 dwg