Fluid Power Journal

Problem: Compressor Shuts Off When Pressure Rises

When troubleshooting for an air leak, a check was added between the separator and the receiver. Then every 10 minutes the compressor would try to start and immediately shut off. A new larger air tank was installed and the pressure switch was replaced but there was no change in operation. When the pressure in the receiver dropped to the setting of the pressure switch, everything worked properly. What was the problem?

See the Solution

The check valve was placed between the pressure switch and the main circuit. When the air pressure dropped between the air compressor and the check valve, high pressure remained downstream from the check valve. The air compressor turned on and immediately hit high pressure and shut off. The solution was to put the check valve between the separator and the pressure switch. Now the pressure switch will sense system pressure and not just the pressure between the check valve and the compressor.

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This teaser is printed in the Fluid Power Journal. Those who submit the correct answer before the deadline will have their names printed in the Society Page newsletter and in the Fluid Power Journal. The winners will also be entered into a drawing for a special gift.

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