WELL PUMP UNIT Russian patent published in 1995 - IPC

FIELD: drilling. SUBSTANCE: pump unit has pump positioned in the delivery path and filter positioned in the sucking path and provided with a gasket at the top part and rotatable valve having a lock. A vertical baffle is secured to the bottom surface of the filter. The baffle separates the sucking path into two vertical passages. The center of the valve base is pivotally secured for permitting rotation with respect to the bottom of the filter. As a result, the valve overlaps alternately wether the left or the right side of the net walls of the filter. In so doing, fluids enters the filter and removes solid particles. Fluid is also fed alternately wether through one passage or trough the other one. EFFECT: enhanced efficiency. 2 dwg