WELL VALVE UNIT Russian patent published in 1994 - IPC

FIELD: oil production. SUBSTANCE: unit has branch pipe, hollow case with stop ring and openings for flowing fluid radially arranged within the branch pipe, spring loaded gate with a sealing surface for engaging with a seat positioned within the case, and centering planks, which are provided with radial passages made in side surface and longitudinal grooves for flowing fluid, positioned on the gate. The unit has a spring- loaded shaft whose axle is provided with a spring-loaded bushing which forms a groove in a butt. Rods, which are positioned in centering planks and engage with the groove within the case when fixing, are received in the groove. The sealing surface of the gate is made of trancated cone with half angle 20-28 whose lesser base points to the seat having a sharp edge. EFFECT: improved design. 1 dwg