CONNECTION-VALVE Russian patent published in 2013 - IPC E21B34/02 F16K17/30 

FIELD: mining.

SUBSTANCE: connection-valve includes cylindrical casing closed from one side by cover with holes, in the central hole of which there is a collar, cylindrical limit stop located from the other side of cylindrical casing, around which there is a spring. Inside the cylindrical casing in sealing elements there is a ceramic insert with cylindrical hole inside capable of movement along the cylindrical casing axis from the collar to cylindrical limit stop and contacting the spring. Cylindrical limit stop when contacting the ceramic insert is capable to create isolated chamber, in which there is a compressed spring. The area of holes in the cover is by 1.5-2.0 times more than the area of ceramic insert cylindrical hole, and the area of cylinder surface, the bottom of which is the cover and the top is the ceramic insert, correlates to the area of ceramic insert cylindrical hole section as 1: (1.0-2.72).

EFFECT: exclusion of cavitation and provision of required flow rate at pumping into the injection well.

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