Pressure switch for booster pump

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Creuzy

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I'm replacing the pump stack on a booster pump that was damaged from running dry. In order to hopefully prevent this from happening again, I'm wanting to put in a pressure switch. But I don't know what I am looking for to make sure I get something that will work. I need a switch that will turn the pump on when there is flow through it and will turn it off when the flow stops. The pump is basically used as a pressure washer so is there a way to keep the pump from cycling off if the sprayer is stopped for short amounts of time? Would a normal pump shutoff switch of 30/50 or 40/60 work in a situation like this - placed on the line leading directly to the pump? Or are there switch specifically made for something like this?
 

Valveman

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All you need is a Cycle Sensor to protect the pump from running dry.

A Cycle Stop Valve and a small pressure tank will work like a mechanical timer, keeping the pump running for a minute or two before the tank is full and the pump shuts off.
 

Creuzy

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No pressure switch will protect the pump. They energize the pump when pressure drops. A flow switch would work. Zero flow off flow 2gpm on. Need a contactor and a waterproof box to make a flow switch work.Need a diagram? Can draw one.
A diagram would be great.

And now that I am thinking about it more, I don't think the booster pump was run dry but was damaged by running with no water flowing through it. So I don't think a pressure tank would help anything in this case. And while I was a bit worried about cycling the pump on and off anytime someone stops spraying - I think the amount of cycling would be minimal and not in rapid succession. So I think it best if the booster shuts off pretty quickly after the flow stops.

Thanks for the responses.
 

Valveman

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Flow switches are not reliable. Best and easiest to protect the pump sensing low amps like the Cycle Sensor. A pressure switch without a pressure tank is not a good idea as it will cause pump cycling as fast as machine gun fire.

The PK1A will control the pump and make it come on when water is used and off when taps are closed. The Cycle Sensor will shut the pump down if it runs dry or rapid cycles.
 
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