FIELD: positive-displacement pumps for handling aggressive and superclean liquids; refrigerating plants and other plants. SUBSTANCE: valve mechanism of suction and delivery unit is made in form of holes arranged in special pattern on fixed ceramic washers for inlet and outlet of medium being by alternating matching of them with slot in movable ceramic washer. EFFECT: enhanced reliability, increased service life and simplified construction. 6 cl, 6 dwg
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