DEVICE FOR METERED LIQUID PIPETTING Russian patent published in 1995 - IPC

FIELD: laboratory facilities, especially liquid metering devices. SUBSTANCE: device accommodates a flexible bottle, a coupling for connecting pipets, a valve and a regulator with a spring-loaded rod positioned on a bush so as to move lengthwise. The regulator is provided with a wedge-shaped groove of variable section arranged in a wall of the passage connecting the bottle with the coupling. The groove is made on an inner wall of the bush in a passage section enclosed by two ring packings placed on the rod. The bush opening facing the spring-loaded end of the rod has an outlet receiving a screw for tightening the spring. EFFECT: more accurate pipetting, simpler construction. 3 dwg