- Connecting Two 50-Liter Compressors to a Single Tank & Pressure Switch: A Comprehensive Guide

Hello.

I have two compressors, both 50 liters.

I would like to combine them so that they both pump into one tank.

Both compressors must be connected to one PRESSURE SWITCH, but can it be?
How to connect a second compressor to pump air into the tank, the first one?

Complete compressors usually have check valves at the outlet. Unless they are separate valves, these are the discharge valves of each compressor.
Compressors can easily be connected in parallel as long as they work with their pressure switches.
You wrote that "I would like to combine them so that they both pump into one tank." Is it supposed to be an additional tank?
You also wrote that "How to connect a second compressor to pump air into the tank, the first one?" Does this mean that you will use the compressor itself or the complete compressor to charge the tank first? .

I have a similar dilemma, the GA 30 VSD FF compressor and the second one a little smaller, can they work in one tank, will they refill or conflict with pressure?

If the pressure switches work in the same range, they will work together, but if there is a difference, the one that switches on at a higher pressure will always be switched on, unless the pressure drop is large enough to switch on and the second one.