"Doug Miller" wrote in message
et...
In article Nihnh.7399$kB3.2294@trnddc08, "Pop`"
wrote:
Sudy Nim wrote:

In general, the check valve should be close to the pump so that there is
less air to trap in the pipes between the pump and the valve; gives it a
faster startup and the water standing in the pipe won't compress and
cause
"spurts" when the pump comes on.

Water doesn't compress anyway...

"Water doesn't compress anyway"...
For the purposes of this discussion and for info only, that's correct but,
in actuality, not a true statement. Water, or any fluid for that, matter,
is compressible. Granted, the change in volume is very small but it is an
important factor that needs to be considered in high response hyraulic
control sysstems. At times, the difference between having a stable vs an
unstable system. Read (google) Bulk Modulus.
MLD

Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.