AUTOMATIC VALVE UNIT Russian patent published in 2014 - IPC E21B34/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and purposed to increase reliable operation of flowing wells. The device contains cylindrical body with receiving and offtaking chambers with axial channel in-between, stepped bushing with choke in the axial channel, cleaning assembly for choke axial channel in the form of a rod connected to spring-loaded case. At that the device is equipped with a saddle in the axial channel of body and cup with longitudinal grooves at the end which is installed between the body and stepped bushing supported by the saddle with formation of hydraulic channel with body connected to openings in the stepped bushing body with receiving chamber. At that the case is equipped with annular piston with butt valve installed so that it can form a flexible joint with cup and cover longitudinal grooves of the stepped bushing in initial position. The case is equipped with radial openings and connected to the rod holder with overflow openings connecting the axial channel of stepped bushing with the case axial channel while spring of annular piston is installed in the chamber between the stepped bushing and cup.

EFFECT: simplifying structure and interconnection scheme.

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