Hi,

I just got an Ingersol Rand compressor from the "FREE" pile
down the street, it’s obviously been neglected and abused but it does
run. I am only going to use it occasionally for topping up the car
tires and bike tires, perhaps a blow gun for cleaning stuff.

Like I said it is in rough condition, I have begun to adjust the
pressure switch. (A)Big spring = cut out, (B)small spring =
differential and it’s working OK, what is the third bleeder valve[C]?
When the contacts open a lever depresses a small brass valve that
bleeds air, this is connected to the manifold under the pressure
switch. Should this bleed as soon as the limit is hit or delay until
the lower or differential pressure is about to kick back in? It looks
like either the valve can be raised/lowered by it’s mounting nuts and
there is a plunger on the armature of the switch that screws up/down
in a plastic thread.
Photo he http://www.freewebs.com/bozonia/hp.htm

I still need to replace the power cord as the Bozo before me spliced
on a two wire cord of too light a gauge wire. Should I carefully
lubricate the pressure switch where it pivots or is it best left
alone.

Thanks in advance for any input, and if anyone knows the make or model
of this switch I would appreciate that as well, there is no dust cover
so I don’t know who made the switch.


Kristin

Kristin writes:

Should this bleed as soon as the limit is hit or delay until
the lower or differential pressure is about to kick back in?

Could be an unloader, or an overpressure relief.