AIR-OPERATED PUMP Russian patent published in 1994 - IPC

FIELD: pump engineering. SUBSTANCE: working chamber is provided with sucking and delivery pipe lines having valves. An air duct with ejector and air-operated switch is in communication with the top part of the chamber and atmosphere. Bellows is secured over periphery of the chamber. The air-operated switch is made of a gate with a rod coupled with the bottom of the bellows through a flexible connection. The air duct is in communication with the delivery pipe line. Length of the flexible connection does not exceed a distance at which the bellows can be stretched. EFFECT: enhanced efficiency. 2 cl, 2 dwg