Its adjustable, remove acorn nut on the end and see a set screw. loosen lock nut and screw the screw in or out to increase or decrease spring pressure. To install put a tee into the pressure line from the pump to control valve. Install relief valve in the tee and run tank port to a no pressure opening on the reservoir. To adjust plumb in a pressure gage, back out the adjustment screw on the relief valve. Dead head the control valve momentarily and see what the pressure builds to before relief valve opens. If its working correct it should build less than 800 pounds. If it goes to 1000 or 1200 without relief poping with adjusting screw backed out a ways stop and check the valve. If it works like it should you can adjust screw in a little at a time and keep checking the PSI until it gets to what you want. Wouldn't go over a 1000 PSI and if it would do what you want with less PSI, 800 or 900 would be better. M&W used a relief valve just like that one in some of there systems, mostly set at 1000 PSI.
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