What do you actually need for pressure?

I can piss with more PSI that comes out of the torch exhaust...


...zap!

 

Zap,
Out of curiosity, what is this pump used for? Water cooled torch?
Jerry

 

It's for a water cooler for a TIG machine. Zap runs city water thru his torch and the solenoid on his machine turns the water off and on. With a cooler and a closed circuit system, it continuously circulates coolant thru the torch.

I miss Massachusetts Jerry :laugh:

 

I had to change mine when I got my new pump. I used the one out of the old pump. It was a lot smaller wire used. The length was about the same on both IRRC.

 

great thanks, I'd guess that the thinner spring would allow the valve to move open at a lower PSI. i'll have to rig up something to check the PSI and dig around in my bag of random springs.

 

This isn't the answer to the question you asked but I installed a pressure gauge and needle valve on the output side of the pump. The needle valve controls a separate line which goes straight to the tank. I opened the needle valve all the way when I first fired up the cooler and I just closed the needle valve until I got to 50psi and it's done. I've gone the route of trying to cut, stretch, find a spring which give 50psi but the results weren't great.

 

That's a good idea. I found a spring that is almost identical to the one I have just a little longer, but it is softer, I try that and if it doesn't work I'll go with a valve. I'm trying not to spend too much money on this.

 

Or you could use one of these:http://www.ebay.com/itm/Cash-Acme-2...68848647903c4a7eacec54a5e0dad5a7&pid=100009&rk=1&rkt=1&mehot=pp&sd=351423265780

 

He's right actually. If your pump is putting out 100 gpm and isn't adjustable to 60, adding a valve (the way he did) after the pump works perfectly. It's just a bypass valve like the one built in the procon. You don't relieve ALL of the pressure, obviously. Just relieve enough that you're still getting a quart or so a min out of the torch. Read what he said again.

 

My bad, I read output side of the tig torch for some reason

 

A bypass regulator splits the pressure. if pump put out 250 then you set it for 60 to torch and the rest should be sent back to the tank. you don't want to bypass the pump by going back to pump inlet because the pump will over heat and destroy its self. Sending it to the tank allows it to cool before the pump pick it up again.
Some pumps the spring can be adjusted by removing the acorn nut and adjusting the screw under it. But 250 down to 60 might be to much. Watch the temp on a modified pump, if it gets to hot the pump will die. Because the flow through the pump is not enough. you have to much coolant going in circles and stuck inside the pump.
I think procon has max temp information on their web site.
The veins swell from heat and stick in the rotor and then grind them selves to pieces. coolant turns black. TIG torch then plugs up.

 

you don't want to bypass the pump by going back to pump inlet because the pump will over heat and destroy its self.

Might want to mention that to procon, that's exactly how their built in bypass (the adjustable screw) works. Sends over-pressure back to the inlet side.