Pulsafeeder Pulsa GLM DM7 - Manual (Page 4)

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1. Introduction
The GLM ® DM7 metering pump is positive displacement, mechanically operated
reciprocating diaphragm pump. Each pump consists of a power end and a process
end separated by a Teflon faced diaphragm. Individual pumps will vary in appearance
due to various liquid ends and accessories; however, the basic principles of operation
remain the same.
2. Principles of Operation
Figure 1, reagent head operation
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.