VALVE UNIT OF SCREW-TYPE WELL ENGINE Russian patent published in 2008 - IPC E21B4/02 

FIELD: mining.

SUBSTANCE: unit comprises a hollow housing with lateral openings, a sleeve with a seat fitted with radial overflow and flow channels and a flow seat mounted inside the housing; a spring-loaded up to the stop slide valve fitted with an upper cowl and valve rings in the flow seat for closing the central flow channel formed inside the sleeve, the slide valve being movable in axial direction. The unit is provided with a rubber collar fitted with a deflector in the middle, the lower free end of which is inserted into the sleeve, in the area of radial overflow channels, in the zone of the seat with a circular gap between the sleeve and the rubber collar with the deflector for interaction with the cowl, with radial flow channels of the sleeve and with the external step on the sleeve; a circular gap is provided between the deflecting bush and the sleeve and a circular seal is provided between radial overflow channels and the external step of the sleeve.

EFFECT: reduction of losses of washing liquid; increase of efficiency, reliability and service life of the valve unit of the screw-type well engine.

4 cl, 2 dwg