1940 curtis

by brian libbee
(stover mo 65078)

I have a 1940 Curtis 2stage 65gal mod 9068-1132 6 it is an up right tank. It works grate was made in St louse mo .230v 1pas would like a brake down on it.and would like to know how the relief valve on top of the head should work properly it has counterweights on the pulley? 4

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Nov 23, 2015
1940's Curtis
by: Buster Norris

Hey Brian, I have a couple of old Curtis compressors, but they do not have any numbers like that, only bore and stroke, one is two stage and a couple of single stages.

The valve you refer to on top as a relief valve is actually an unloader valve that is controlled by the governor weights on the flywheel and linkage from it to the intake valve. It keeps the intake valve open till the rpm is high enough to close it by the governor action.

I have not been able to find any information on the units. The valves are just round discs in the top of the unit and pretty easy to access and clean. They are built like a tank with Timkin style taper roller bearings and do a great job.

Hope this helps a little, have a great day,

Buster Norris

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