the square D switch i have will go down to 60 psi on with about 85 off.rkcarguy wrote: ↑Thu Apr 18, 2019 10:43 am I have a question for you all, is there a lower pressure 12 volt pressure switch available? My brakes are going to be air pressure applied to release them and I'm using 1-1/4" cylinders so I don't think I will need more than 60-75 PSI. All the switches seem to be 95-110 or similar.
So that unloader valve on amazon, that is a purely mechanical valve that dumps the pressure off the compressor when it stops running? I know my little pancake compressor reaches pressure and shuts off and there's a "hiss" so it must have one but I don't know how it works.
just because they are preset to 95 to 110 psi does not mean they can not be adjusted. its just a nut on top of the spring, at least the model i have.
I did run mine that low for a short time but the air cylinder on my booster truck required a higher pressure to move the gear so i had to crank it back up. the brake system is supplied through a regulator set between 40 to 60 psi depending on how many cars have brakes and the layout grades.