You're right, I had the actuation reversed when I wrote that.  Thanks
for catching it.

>>> "griffco" <[EMAIL PROTECTED]> 10/08/03 09:53AM >>>
Nolan Penney said:

> If the diaphragm were to stiffen with age, that could result in
higher
> pump pressures.  Never seen that actually happen, but theoretically
it's
> possible.

I wonder how this is possible?  The diaphram is driven by the spring,
which
in turn is loaded (compresed) by the lever running on the cam.  If the
diaprhagm gets stiffer, the spring has less chance of moving or flexing
it.
The result is less fluid moved, either due to less movement of the
diaprhagm, or due to the diaphragm moving slower on each stroke. 
Anyway,
that's the way I see it. I've had diaphragms stiffen up to where they
won't
move at all.

cheers, Fred


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