SUCKER-ROD WELL PUMP UNIT Russian patent published in 1995 - IPC

FIELD: pump engineering. SUBSTANCE: valving unit is constructed as a mechanically controlled check valve. The valve has ball gate, guide, cylindrical plunger set in the guide and connected with the ball gate, horizontal axles arranged symmetrically on both sides of the plunger, and weight which underlies the plunger and is coupled with the plunger and axles through a flexible connection. The guide has a protective pin made of brittle material and constructed as a cantilever. A ring recess is made in the guide. A grove for the protective pin inclined to horizon is made in the plunger. The groove corresponds to the intermediate position of the ball gate. For removing the trancated part of the pin, a through groove is made in the bottom part of the guide. EFFECT: enhanced reliability. 3 dwg