A-8
Section 2 Model 199 Differential Pressure Unit (DPU)
Pulsation Dampener
The pulsation dampener (Figure 2.1, page A-5) controls the ow of ll-liquid
between the high and low-pressure bellows with an externally adjustable pul-
sation dampener needle valve. Restriction of liquid ow reduces the effects of
pulsation. In applications where pulsation is not a problem, the needle valve is
set to the full-open position.
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