Our pump is kind of unorthodox. If you click on this URL you should see a picture of it.
http://www.tps-inc.com/wheatly2.jpg
We use a Baird bypass relief valve. Located in the lower right part of the picture. We use this to adjust the pressure that we want. Since the pump returns all water to a surge tank (that does not go out the wand) we can select any tip size!
We can run up to 3 lines off of this Wheatley pump (usually run only 2). We currently are using 1-1/8†plungers running at 485 rpm. As long as the tips sizes do not exceed a total of 10 we can maintain adjusted pressure. For example when we run two wands each wand uses a 4.5 tip or smaller. If we are only using one line then we can use up to a number 10 tip and still maintain 3000 psi or whatever pressure we have set with the Baird valve.
This pump is run by a 20 hp 220 3-phase motor. The other thing that is different with this setup than others is that when we are operating hot our pump runs hot! Because of this we are never concerned about allowing the pump to run for extended periods of time (without spraying) since we don’t need to worry about the pump overheating!
Dave Olson
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Tidy Powerwash Service, Inc. P.O. Box 781, Catlin, Illinois 61817 Phone 217-427-5557, Fax 217-427-2632 We are a commercial cleaning contractor serving East-Central Illinois and West Central Indiana since 1984.
http://www.tps-inc.com