Pulsafeeder Pulsar Shadow - Manual (Page 7)

1. Introduction
PULSAR Shadow
® 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 mechanically
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.
1.1 Overall Operation
Figure 1
A diaphragm reciprocates at a preset stroke length, displacing an exact volume of process fluid.
Diaphragm retraction causes the product to enter through the suction check valve. Diaphragm
advance causes the discharge of an equal amount of the product through the discharge check
valve.
1