Graco MP-25 Operation page 43

Ideal set up method, to be amended to suit your actual application
The rotor stator pump is a positive displacement, progressive cavity pump, the positive
displacement aspect being controlled by the clamping tension on the stator.
1. Adjust the stator to have minimal tension.
2. Place the desired length of hose on the pump unit, and elevate, if required to suit
your actual discharge height, complete with any output device fitted.
3. Set your water flow rate to the recommended reading
4. Start the machine at your chosen speed with just water and a small amount of dish
soap running through the machine.
5. Measure the flow of output at the discharge point
6. Progressively and evenly tighten the clamp on the stator until no more output is
achieved.
7. Stop the machine.
8. Remove the output hose, and connect the pressure tester
9. Turn on the machine, close the pressure tester valve and note the pressure. This is
the pressure you require to set the rotor stator to, to pump at your required rate.
Note. Actual material will typically produce higher pressures and lower flow rates, and
will require some experimentation, but this method will provide a good approximation
Excessive clamping force just generates more heat more wear, higher energy
consumption and a high potential damage in the event of a plugged hose, blockage, etc.
A general and typical stator pressure setting with water is 300PSI, which will meet most
applications.
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