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Overview of Pump Hydraulics
Although the details of operation vary, the general principle is similar for all
PULSA Series metering pumps. Here's a summary of how they work and why they're
the first choice of people who put the emphasis on quality, serviceability,
and economical cost of ownership.
The pump drive mechanism transmits a reciprocating action to a piston operating in
a hydraulic reservoir. The piston's forward movement transmits hydraulic force against
a diaphragm separating the pumping mechanism from the liquid being pumped. The
diaphragm moves in a direct relationship to the piston and displaces process liquid
through the outlet check valve. Backward movement of the piston reverses the cycle
allowing fresh liquid to enter the metering head through the inlet check valve.
Diaphragms and heads are available in a variety of materials to meet any corrosive
pumping problem.
Because the motion of the diaphragm can be controlled by the drive mechanism, the pumping
rate can be metered with exceptional accuracy.
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Three automatic valves keep the entire system hydraulically balanced for trouble-free
operation.
A make-up valve (1.) permits the flow of replacement oil
from the hydraulic reservoir to the area between the plunger and the diaphragm.
A by-pass valve (2.) releases oil and terminates the
hydraulic pumping action when the oil ahead of the plunger in under excess pressure from
accidental line stoppage. This is a built-in safety mechanism that protects the pump.
A bleeder valve (3.) automatically and continuously
releases any entrained air or oil vapors to maintain a "hard" hydraulic system.
Since the diaphragm has no mechanical attachment, it is HYDRAULICALLY
BALANCED and stress free. When the diaphragm is working within the recommended
temperature range, it is immune to the effects of corrosion and abrasion. These features work
together to give the diaphragm an unlimited life.
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