FIELD: pump engineering. SUBSTANCE: air-operated pump has housing, end switches mounted inside the housing, two driving chambers connected to the air distributor through the actuating air lines, and two oppositely arranged working chambers connected to the hydraulic distributor provided with a flat slide valve and distributing collector connected to the rod of the control air cylinder connected with the actuating air lines. Inside the housing are two pistons interconnected via a rod to define actuating and working chambers. The distributing collector is provided with bottom knife. The slide valve has the top knife. The air distributor has a knob for relieving pressure from the control chamber. EFFECT: enhanced efficiency. 1 dwg
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