Chris Green Wrote in message:
jim k wrote:
Wrote in message:
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.


? My "whole house" water pump is set to 3.5 bar.

I expect some people's mains water pressure is even higher...

Our mains pressure is 5 Bar or thereabouts. However my boat's
plumbing can't cope with anything like that.


Yup.
(I had misread the pressostat suggestion as being related to the
inlet solenoids pressure capabilities, not the pressure switch
side of things).
--
Jim K


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