VALVE Russian patent published in 2016 - IPC F16K31/02 

FIELD: construction.

SUBSTANCE: invention relates to valve industry, namely to valves with pneumatic control, and is intended for start-up and shut-off of working medium in wide range of pressures, including under conditions of low temperatures. Valve comprises body with inlet, outlet branch pipes and seat, large gate with seat, inner bore and face seal, small gate with end face seal, casing bottom, spring and drive. In housing in output cavity stepped groove is made. On drive side housing has groove and seat. Body bottom is made in form of cover with central sleeve with internal blind groove. Sleeve with stop are installed in groove of large gate. Small gate is made with internal blind groove, shoulder and stem. In body there is piston with stepped stem with groove and face seal in contact with seat body and interacting with outer diameter of piston with inner diameter of body groove, larger diameter stem with inner diameter of stepped grooves of body and end face of stem smaller diameter with end of small gate internal blind groove. At that, collar of small gate contacts with sleeve stop. Small gate stem interacts with internal surface of blind grooves of cover central sleeve.

EFFECT: use of said unit ensures multiple actuation of valve at high working pressures at inlet, including under low temperatures, and simplifying design in comparison to prototype.

3 cl, 1 dwg