Make a note of this pump's F number, also known as its Flow Fluctuation Figure. Use the F number with the % residual fluctuation required figure from the smoothness shown for each type of application. These two figures, the F figure and the % figure, applied to the size selection formula give you the smallest practicable damper size.
See below for figures
Need a Hand? Take this Step by Step Process to help you choose your perfect fitting damper Start Here
Find the "F" Valve of Your Pump - "F" is a correction Factor on the square of number of displacers.
Example, Centrifugals are intrinsically good - have a high F, Sandwich diaphragm metering pumps have a low F.
F = 0.8
F for duplex diaphragm heads also = 0.8
A simplex diaphragm head pump is pushed by a 100 mm diam. piston with a 150 mm stroke @ 205 spm
5 cm Piston Radium x 5 cm pist. rad. x (Pi) 3.142 x 15 cm stroke = 1.18 Liters per stroke
@ 3.4 Hz.
Find your % residual fluctuation required figure
from the smoothness shown for each type of application. GO TO
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