PNEUMATIC DISPLACEMENT PUMP Russian patent published in 1996 - IPC

FIELD: manufacture of pumps. SUBSTANCE: pump has two working chambers immersed in outside water; each chamber is provided with two check valves first of which is brought in communication with outside liquid and other is connected with common pressure pipe line; pump is also provided with gas flow selector connected to compressed gas source which brings upper portions of working chambers in communication; flow gas selector is made in form of bellows and is provided with float located in one chamber. Gates of intake valves are provided with shock absorbers made in form of floats of non-streamlined shape or braking plates which dampen shock in unlocking the valves. EFFECT: enhanced reliability. 3 cl, 2 dwg