Pressure switch cut in 40 psi / 70 psi cut out??

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by Matthew Embury, Jul 6, 2018.

  1. Matthew Embury

    Matthew Embury New Member

    Joined:
    Oct 7, 2015
    Location:
    Grants Pass, Oregon
    Hi everyone, my tank pressure is 38 psi with a 40/60 switch. I have a 20 gallon tank and CSV valve set at 52 psi running a hose at 2 gallons per minute. I noticed tonight that the cut out isn't till 71 psi or so? Should I be concernd or????
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Yes. The concern is that you are over-stretching the diaphragm.
    Adjust the differential nut if you want to raise or lower the
    cut-out setting while keeping the cut-in pressure constant. The
    differential nut is the 3/8-inch nut that adjusts the smaller of
    the two springs in Models FSG, FYG, FRG, and Type G switches. Turn
    the differential nut clockwise to increase the cut-out pressure and
    counter-clockwise to lower the cut-out pressure. Adjusting the
    differential nut will change only the cut-out setting while the
    cut-in setting remains unchanged.​
     
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  4. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    Turn off the pump and drain all the water out of the tank and see if the gauge goes to zero. Could just be a bad gauge.
     
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