What are the two types of devices that are used to "Stop" and "Start" air compressors when compressed air is

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being stored in a reservoir?

Answer 1

I assume you're asking about an air compressor powered by an electric motor. First, of course, is the power switch. If it's off, the compressor won't operate. Second would be an air pressure sensor, usually with hysteresis. It would turn on the compressor if the reservoir pressure is below 40PSI and turn it off if the pressure is over 80PSI. You want this range as large as practical, as long as the air pressure is enough to do the job and well within safety limites. Most of the strain and wear on the system comes from starting the motor, so you minimize the number of starts.

Starting a large electric motor would cause a very large initial surge of current drain, so they are usually started with a series capacitor to reduce the starting current. Once the motor is turning, this capacitor is removed from the circuit. This capacitor, along with its sensors and controls, is called the starting capacitor.

Finally, there could be an additional pressure sensor as backup safety. If the pressure exceed 150PSI, it might shut off the power, release the air, or both.

Answer 2

Pressure sensors trigger an on-off switch.

Answer 3

Pressure release valve.

Limiter switch

Also, the start-stop button :)

I wish you well..

Jesse

Answer 4

I would think it would be some sort of pressure swithc that activates a relay.