VALVE DRIVE HYDROSTATIC BALANCING SYSTEM Russian patent published in 2019 - IPC E21B34/16 F16K15/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to equipment of oil-field equipment and can be used in valve devices, the shut-off element drive of which contains a stock, for hydrostatic balancing of the latter. System for hydrostatic balancing of valve drive comprises body, rod installed in annular protrusion of housing with possibility of axial movement, shut-off unit consisting of seat and gate installed in lower part of rod, a passage channel made in a rod and a gate, communicating with the circular cavity between the rod and the body above the annular projection by means of a radial hole in the rod. Stock is equipped with an external annular collar in contact with the housing above the annular projection, between the annular projection of the housing and the external annular collar of the stock, a sealed air chamber is formed, wherein the inner diameter of the seat, diameter of the rod and internal diameter of the housing in the air chamber are related by a certain ratio.

EFFECT: technical result consists in ensuring hydrostatic balancing of valve drive rod to ensure reliable valve operation when using low-power drives.

1 cl, 1 dwg