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On Monday, 27 March 2017 13:33:03 UTC+1, Chris Green wrote:
I'm looking for a replacement for the water feed pump on our little
boat. The 'standard' marine ones from Jabsco are a ridiculous price
as are the spares for the worn out one that I have so I'm looking for
alternatives.

A replacement pressure switch (all I *actually* need is the spring
contacts) for my Jabsco pump is more than £30. All their spares are
silly prices, even paper gaskets cost tens of pounds.

So, as I said, I'm looking for alternatives. The difficult part is
finding a pump that doesn't deliver *too much* pressure. It's easy to
find pumps that deliver 60 to 100 psi but this is too much for the
bendy plastic pipe plumbing. I need a pump that delivers around 10 to
15 litres/minute at 15 to 25 psi (that's 1 to 1.5 Bar).

As I said it's easy to find pumps that deliver 60psi or more and cost
only £10 to £15 but all the lower pressure ones cost £60 or more.
Maybe I'll have to spend that much but I'd prefer not to (surprise!).

Alternatively a pressure switch that operates in the 1 to 2 Bar range
would solve my problem, I could use it with the existing pump (and a
big fat automative relay to handle the current if necessary).

I don't know what pressure washing machine pressostats work at, 1 or 2 bar
seems rather high.

I expect many pumps would work if run on less than rated voltage, at what
current draw I don't know. I don't know how long little windscreen squirt
pumps can run for.

Not long with the one I tried.

Boat bilge pumps run a lot longer. Not that cheap tho.