| 摘要 |
FIELD: dosing equipment used in perfume and cosmetics. SUBSTANCE: dosing pump has casing provided with head and attached to closure. Stem, piston, spring and return valve are mounted inside casing. Return valve has movable member made in the form of cylinder with hemispherical part at its lower end and projecting parts at its upper end. Projecting parts abut against spring to restrict working stroke thereof. Pump of such construction is used for pumping out dosed amount of liquids from hermetically sealed bottles. EFFECT: reduced production cost and enhanced reliability in operation. 2 dwg |
