A low volume/low pressure pump that would be attached
to a water tank and feeding a handwashing faucet.
When the valve is closed the pump detects the blockage
(the higher pressure) and shuts down. When you open
the valve the pump kicks on and you get your
Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]
A zillion years ago, my family went on vacation in
a rented RV. There was a pump much like this, to
pump water from the fresh water holding tank into
the sink, toilet, etc. It would be 12 volts, but
a RV supply place should have some thing.
Demand pump sounds right. I demand someone check
it out and post to the list! ;-)
Christopher A. Young
Learn about Jesus
Actually, I think what's being called an "On Demand Pump" in here is
really just a pump with a built-in pressure switch. These kinds of
pumps are common in spraying applications because all you need is a
valve to remotely turn the pump on or off. Both Shur-Flo and Flo-Jet
make these kinds of pumps in both 12 Volt DC and 120 Volt AC models, and
I suggest the OP look at both companies offerings. Also, most places
that sell spraying equipment will have a service department where they
will repair these pumps for a service charge.
Both companies pumps are also used in floor and carpet cleaning
equipment, and any places listed under "Janitorial Equipment & Supplies"
that have service departments to repair the equipment they sell will
also repair both Shur-Flo and Flo-Jet pumps.
I think the OP should be looking for a variable pressure pump since most
spraying equipment and janitorial cleaning equipment operates at between
50 and 250 psi pressure. The kind of water pressure you get in a boat
or airplane washroom to wash your hands is probably only about 10 or 15
psi, and I don't know why they set the pressure so low, but I expect
it's to save water because in a plane at least, it's very expensive to
carry that water in the plane instead of another passenger.
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