Controlling a fresh water pump

[Drascomber]

OK so I had this bright idea.

Instead of decanting water from big jerry cans kept in lazarette into smaller 3 litre containers for convenient pouring into saucepans, kettle, washing up bowl etc I'd have a Whale submersible pump that I could lower into the Jerry cans and have fresh water on tap almost like a big yacht.

I plan to rig a pistol grip thingy at the business (output) end but the trouble is that when I tested it, this pump puts out 1 litre in under 4 seconds and is difficult to control with just an on/off switch. So what I think I need is some kind of electronic device such that my trigger produces a flow that varies with travel or pressure without wasting valuable electricity - or do I need a physical flow restrictor (tap).

Thoughts . . .

 

[VicS]

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Thoughts

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A smaller pump, but don't know what. (how about a 24 volt one running on 12volts)

A pressurised system exactly "like a big yacht"

A hand pump like a little yacht

 

[sarabande]

Caravanners have this sussed properly.

http://www.caravanadditions.co.uk/acatalog/Water_Pumps.html

 

[Adamastor]

You didn't say whether your pump's got a pressure-switch or not, but I'd put in 2 bits o' kit- a little accumulator- say 1-litre, and a tap, for sure. Diaphragm pressure-pumps usually just run at one speed, but with a tap to throttle the output, and an accumulator tank to both smooth the flow, and absorb the "excess" delivery, you should be in business. If the pump's cycling on and off to achieve the flow-rate, it's perfect, but if the pump's just running continuously, you'll need to put in a pressure-switch, which will be available from your local Swindlery.

 

[Drascomber]

[ QUOTE ]
Caravanners have this sussed properly.

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The 801 is what I have. What I need to do is control it.

 

[wiggy]

caravans use a tap with built in switch, trun on tap water flows and as per normal tap controls volumn.

 

[vyv_cox]

There is no device that I'm aware of that modulates flow electronically, at least not within the affordable range. Pump control on boats and in caravans can either be pressure or flow driven, but it's always either on or off. A tap seems like the obvious solution.

Whale do an additional device that can be added in to the submersible pump circuit. It's an in-line electrically-controlled valve, that effectively turns a centrifugal pump into a pressure controlled one. There's one here . I have one in my on-deck shower that runs from a 10 litre bottle.

Alternatively, just put a restrictor in the hose from the pump.