PIPETTING DEVICE Russian patent published in 1998 - IPC

FIELD: laboratory utensil. SUBSTANCE: pipetting device includes air rarefaction source, flexible bottle, for example, coupling for connecting pipette and main valve which are functionally interconnected. Main valve includes stem located in bush and engageable with shut-off member, for example, diaphragm fitted in way of communication of coupling with rarefaction source and with atmosphere. Bush is provided with additional valve fitted in section between point of connection of its hole with passage running from air rarefaction source. Additional valve embraces stem at clearance; it is kinematically linked with stem. EFFECT: enhanced reliability. 13 dwg