Importance

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Abstract

A pump is adapted for discharging a very small quantity of a liquid and has a discharge port opening and shut valve, discharge element and liquid drawing passageway opening and shut valve. The discharge port opening and shut valve includes a rod-shaped element which can advance to and retract away from a discharge port. The tubular discharge element and opening and shut valves mate relatively movably with each other coaxially with the rod-shaped element on the cylindrical surface of the red-shaped element. The advancement of the discharge element discharges the liquid which has been introduced into the liquid drawing passageway and regulated by the opening and shut valves to a predetermined amount.

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First Claim