From: MV (MV@dc9.tzo.com)
Date: Thu Dec 29 2005 - 14:14:12 PST
Yep, you are missing an unloader valve. On a engine powered compressor
there is also usually a link to the throttle so the engine idles down
while the compressor is unloaded.
I have unloaders on my 10 hp electric compressor also since it would be
very hard to start the motor with the pump loaded. But you would need a
different kind of unloader valve than the one that is on my compressor
since yours is engine operated.
Dave
Ken Boge wrote:
> Mark,
>
> This is probably part of the continuous run system. With an electric motor
> operated compressor there is a pressure switch that will stop the motor when
> the tank pressure reaches a certain level and turn the motor on again when
> it falls below a set amount. A gasoline engine operated compressor normally
> runs continuously so there needs to be a mechanism for unloading the
> compressor to prevent it from over pressurizing the tank. The system uses
> compressed air from the tank to operate unloading valves at the top of each
> cylinder. When the valves open it sounds like the compressor is idling and
> when they close it will sound like it is under load again. There should be
> a pressure valve connected to the tank with tubes going to the top of each
> cylinder.
> If the tubing is not connected there may be a part missing. Do a Google
> search and you might find an operating manual and/or parts manual for your
> compressor. Don't operate your compressor without a functioning safety
> valve!!
>
> Good luck,
> Ken
> San Jose, California, USA
> M35 A2
> M151 A2
>
>
>
>>This is slightly off topic, but I thought someone here
>>would be knowledgeable about the question I have. I’m
>>trying to get my air compressor hooked up and I have a
>>Dresser two stage V-type compresser with a 10hp Kohler
>>engine. On the back side of the compressor there is a
>>thing, that may be an oil pump, I don’t know, but it
>>has three fittings for 1/4in. tubing to go to the top
>>of the heads. Does anyone know what the tubes are
>>for? I’m seen tubing like this on other compressers
>>which go to the part of the heads where the valves
>>are. I guess it is either for oil or some pressure
>>relief for some reason. There are three outlets on
>>the pump and if one goes to each head, then were would
>>the other go? Any help would be appreciated.
>>
>>Thanks
>>Mark
>
>
>
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