I appreciate the information. Definitely working on getting the pictures together for you guys. I'm just running a little behind with other projects. The manual calls it a relief valve, but doesn't say specifically for what function, so it could be a backpressure valve...and the picture of the filter in the manual is a little different in outer appearance than the two I have, and it may be different internally as well. I hope my forthcoming pics will help determine. When I got it, as part of a general overall teardown and cleanup, I took the filters apart and thoroughly cleaned them up, and they were a mess. The round perforated screens (#11) were about rotted away, but the condensation jar (#15) as well as the internal filter case (#14) were fine, just cruddy and ugly. Cleaned up well.captain wrote:I have a USD Cyclone compressor I bought new in 1968. The Cyclone is a 3.5 cfm compressor built by Luchard and replaced the Alize. The filter tower had a built in backpressure valve. There were relief valves screwed into the top and bottom ends of the filter tower. It is possible that what you are assuming to be a relief valve is or was a backpressure valve. Post some pictures of the disassembled valve and I maybe able to determine which. Except for the tubing and fittings all fasteners are US. My main concern would be the condition of the inside of the filters. The one filter it came with only used activated carbon. When exposed to excessive water it produces sulfuric acid which causes rust. Having the molecular sieve before the carbon plus frequent draining of accumulated water is a must.
I couldn't agree more, and if I haven't already said it, I am very grateful for the knowledge that's represented here. There's no substitute for experience.Bryan wrote:The info above from Bill and Tom isn't in any book...Only comes from experience and wisdom. We are lucky to have you guys around!
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Thanks, Captain,captain wrote:The relief valve appears to be the same as on mine but the drawing seems to be missing an O Ring. Question, part #4. the clapperette, does it have a hole through the middle and small holes on the side at the top end. If so there should be an O ring that goes on top of the brass washer. The way it works is pressure pushes the capperette up until the small holes are pushed past the O ring and air is vented through the center of the clapperette and out the small holes. If you didn't find the O ring look inside the body (#1). Either it is bad or missing.
Yes, there are threads in that "not used" hole, but no other holes in it...thanks.captain wrote:Yes the "seat" is not a seat just a nylon gasket to seal the relief valve. Although the treads are 1/4" TPT it seals with the gasket. A nylon washer of the correct size should work. Available at most hardware stores. The hole shown as the small hole in the 1st picture appears to be the filter outlet to the fill whip. Apparently the set screw and sinthered filter is only for the relief valve, a good idea because of the extremely small outlet hole in the clapperette. Are there any threads in the "not used" hole in the 2nd picture.
Air and condensate enters through the tube in the center of the filter and condensate is collected at the bottom. The air then travels up through the carbon and out the small hole to the fill whip..
Thanks!captain wrote:Forget the activated alumna, use 13X molecular sieve. Sieve is first to dry the air before the carbon . Put the relief valve on the Last filter to protect the whole system.
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