Just one minor clarification/correction to my previous posting:
If the pump diaphragm is installed too tight, pressure builds up earlier
in the pump stroke (as I indicated), but the extra pressure is not
because it compresses the spring "further" but rather because it starts
building up pressure at a point earlier in the stroke where the spring
happens to be more compressed. It's really the SAME basic idea, but this
wording is more accurate.
Also, I wanted to add that a tight pump diaphragm can also create what
is called a "rebound" effect, in which the diaphragm will "rebound"
farther than usual on its return stroke, adding a little pressure spike.
In addition, if the diaphragm is much too tight, the diaphragm itself
can add spring tension due to stretch, increasing the pressure, at least
on the first half of the pump stroke.
Alan
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