Q:

How do you adjust a pilot unloader valve?

A:

Quick Answer

To adjust the low end pressure of a pilot unloader valve, loosen the differential locknut, turn the differential screw clockwise to seat the valve, secure the differential locknut, loosen the screw pressure locknut, and turn the pressure screw counterclockwise. Cycle the compressor to the minimum load pressure, turn the differential screw one-quarter turn counterclockwise, secure the differential locknut, and slowly tighten the pressure screw until air escapes from the top of the valve to determine the lower pressure setting.

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Full Answer

Once you have the bottom pressure setting, secure the pressure screw locknut, and cycle the compressor up and down. Note making the minimum pressure setting. If the pressure is higher than desired, turn the pressure screw counterclockwise; if it is too low, turn the screw clockwise. Repeat these steps until the lower pressure is at the desired setting.

After setting the bottom pressure, cycle the compressor, and note the maximum pressure setting. If the pressure is higher than desired, turn the differential screw counterclockwise; if it is too low, turn the screw clockwise. Repeat these steps until the maximum pressure is at the desired setting.

After the pressures is set, tighten all locknuts. You can now operate the compressor as normal.

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