1. INTRODUCTION
1.1 GENERAL DESCRIPTION
PULSAR metering pumps are positive displacement reciprocating pumps. They combine the
high efficiency of the plunger pump with diaphragm sealing to prevent product leakage. Each
pump consists of a power end and a process end separated by a hydraulically operated
diaphragm. Individual pumps will vary in appearance due to various liquid ends, accessories,
and multiplexing; however, the basic principles of operation remain the same.
2. PRINCIPLES OF OPERATION
2.1 OVERALL OPERATION
Figure 1
A piston reciprocates within an accurately sized cylinder at a preset stroke length, displacing an
exact volume of fluid. This piston does not pump chemicals: it pumps hydraulic oil. The piston
and associated mechanisms are enclosed in the eccentric box that also serves as a hydraulic oil
reservoir. A diaphragm separates the oil from the product pumped. The diaphragm moves in
exact response to piston displacement. The diaphragm does no work and acts only as a
separator. Consequently, oil displacement is translated into equal product displacement.
Piston retraction causes the product to enter through the suction check valve. Piston advance
causes the discharge of an equal amount of the product through the discharge check valve.
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