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Pump working principle, part names and identification codes are de-
scribed in this section.
Introduction
Pump structure & Operating principle
The rotational motion of the stepping motor is changed to linear motion by the direct drive unit. Liquid is loaded
into the pump head and then delivered to a discharge line as the bellows reciprocates.
Principle of operation
●
The bellows expands and contracts as the ball screw reciprocates to create volumetric change in the pump
chamber.
● Liquid is taken in as the bellows contracts and is pushed out as it expands in sync with the action of the
check valves (pump head valves).
■ Discharge process
Overview
Introduction
Check valve
Bellows
Stepping motor
OUT
Ball screw
Cylinder
