Step 1: The componets
Step 3: First test
I proceeded then to perforate the stopper of the barrel so that it can enter the pressure hose.
I then run another larger hole to accommodate a home made safety valve.
As you can see in figure this safety valve is completely homemade and is actually the imitation of a pressure switch or a switch to a switch, pressure: this place in series with the compressor will interrupt the power supply to the compressor itself when the pressure detected by the membrane will be more than the value that we have established ourselves with field trials.
The membrane consists of a piece of rubber bicycle air Chamber.
However, I would suggest something more subtle to have greater sensitivity of detection.
It is clear that the calibration of the sensor is one thing that should be done with care and it is equally clear that I do not assume any responsibility concerning damages to things or people or animals arising from the incorrect execution of these steps or others present in this instructable: it is also a home made and thus cannot have NO reliability.
This is an experimental implementation and therefore goes untreated as such: keep it under control while it is running, and if you also dismiss, release pressure, (or by opening the CAP or some other alternative way) after removing the engine power of small compressor.