WELL VALVE DEVICE Russian patent published in 2005 - IPC

FIELD: oil and gas industry.

SUBSTANCE: well valve device has body with upper inner and lower outer attaching threads. In recess, made in middle portion of body, a lid is fixedly placed with through aperture. In lower portion of body from the end of recess side and longitudinal channels are made, provided with saddles and ball valve with diameter d, mounted in saddle of side channel and capable of returning through recess into longitudinal channel and backwards. On the saddle of longitudinal channel ball valve with diameter D is placed. Diameter D is greater than diameter d of side channel ball valve. Distance L between centers of side and longitudinal channels is not greater than two diameters d of ball valve of side channel, i.e. L < 2 d. Depth G of placement of mounting surface of longitudinal channel saddle from end of recess is greater than sum of diameters d and D of ball valves, i.e. G < D + d. Depth g of placement of mounting surface of side channel saddle surface from end of recess is not greater than half of diameter d of ball valve of side channel, i.e. g < 0.5 d. on end surface of lid, directed to channels in diametric plane, a small recess is made in form of cylindrical segment having width B and height H. Width B of small recess is greater than diameter d of ball valve of side channel and is less than diameter D of ball valve of longitudinal channel, i.e. d < B < D. Height H of small recess is greater than diameter d of ball valve of side channel, i.e. H > d. Symmetry plane of recess coincides with plane, passing through centers of longitudinal and side channels. Through aperture of lid is made above small recess in form of groove with width b, value of which is less than diameter d of side channel ball valve, i.e. b < d. Most of area of through aperture is made above half of small recess, placed above longitudinal channel.

EFFECT: higher reliability, broader range of functional capabilities, lesser manufacture and maintenance costs.

8 dwg