Pressure switches for compressors

Pressure switches for compressors , also known as pressure switches, ensure that the compressor turns on at a minimum set pressure and shuts off at a maximum set pressure. Most pressure switches operate at a differential pressure of 2 bar.

Often the pressure switch is replaced unnecessarily because it looks like it is leaking air. But this can also have other causes. This is because the pressure switch has a relief valve built into the 230 volt and smaller 400 volt compressors. This ensures that when the compressor shuts down, the rest of the pressure of the pump is vented so that it can start up freely again during a start-up. When the compressor has stalled and it is leaking air at the pressure switch, the check valve on the tank is often leaking. From this valve, a tube or pipe goes to the relief valve in the pressure switch. If the check valve is faulty or leaking, air will continue to come out of the tank and it can vent through the hose and relief valve. 

Then it is not the pressure switch that is defective or the relief valve in the pressure switch. You should then check if the check valve is leaking by following these steps.

1. Compressor does come up to pressure but continues to blow off when it has stalled via valve in pressure switch, if so go to step 2 
2. Unplug the compressor and depressurize the compressor via the drainage valve at the bottom of the tank.
3. When the tank is depressurized and there is no more water in the tank, you can open the check valve by unscrewing the end.
4. In the check valve you will find a rubber and spring, these can be worn but dirt can also be in between.
5. You can try cleaning it and stretching the spring a bit. Put the whole thing back together with some petroleum jelly.
6. Close the compressor's moisture drain and allow the compressor to return to pressure. If the problem is not solved, go to step 7 or 8.
7. If necessary, you can replace the rubber , we have these check valve rubbers in the program.
8. You can also replace the complete valve, which you can find here. Make sure you select the right connectors.

When the  compressor is completely depressurized and you start it up. Then the relief valve will always continue to leak until the compressor has reached a pressure of about 1.5 or 2 bar. Only then does the relief valve close. If the compressor still does not come up to pressure, the capacity of the compressor is often worn out to such an extent that it can no longer supply the liters and pressure.