pressure switches

[Jim Grammer <jimg@domain.elided>]

>Unloader valve            Grainger          5A703          $8.60 ea
>Pressure switch           Grainger          5B419          $13.65 ea

Thanks for the laundry list, John. Looking at the pressure switches in 
Grainger, I see that part #2FG79 is the same spec's as your 5B419 with an 
additional feature of 'unloader'. Wouldn't that perform the same function 
as the seperate unloader valve?

It seems my next question may have answered the first. I didn't see a 
seperate check valve listed, but looking at the description for the 5A703 
unloader valve I see 'Eliminates the need for pressure switch unloader and 
receiver check valve'. Altough it doesn't specifically say so, I'm assuming 
there is a check valve in this unit.

If I've got this right, one could use a pressure switch w/unloader and 
check valve combo, OR a pressure switch with a combined unloader check 
valve. Correcto?

Also, any thoughts on a circuit breaker/fuse value for the 12v supply?

Jim