IWAKI EWN -B16 TC, Instruction Manual

Page: 12 / 116

12
Overview
Introduction
The information such as characteristics, features and part
names are described in this section.
Introduction
Pump structure & Operating principle
The EWN series is a diaphragm metering pump which consists of a pump
head, drive unit and control unit. A diaphragm is directly driven by electromag-
netic force.
Principle of operation
The pulse signal controls the electromagnetic force and spring force in order
to make reciprocating motion. The reciprocating motion is transferred to a
diaphragm through a plunger and then volumetric change occurs in the pump
head. This action transfers liquid along with pump head valve action.
Control unit Pump head Drive unit
OUT
IN
Spring
Pump head valve
(Discharge side)
Pump head valve
(Suction side)
Plunger
Diaphragm