BACK PRESSURE VALVE Russian patent published in 2013 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: valve comprises a body wherein there is a locking group consisting of a valve seat and a spring-loaded ball and a cage with an inner cavity for a spring and medium openings. The frame has two grooves contra lateral in relation to a ridge in a central hole of which there is a ball coupled with the seat from one side fixed in the groove with a ring nut, and with a spring from the other side fixed with the cage. The medium openings are formed at the bottom of the cage, while the ridge has two double-sided bevels.

EFFECT: extended area of application of the return valve ensured by designing the construct using one complete assembly to produce two return valves different in the application and functions.

3 cl, 2 dwg