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Have they started putting silencers on these "quiet" compressors unloader valves yet? I have a California compressor. Yeah, they are relatively quite until they reach pressure and blow off to unload the compressor. I ended up adding a solenoid valve with a silencer on it, bypassing the original unloader valve.
The quick connect fittings on the compressors go to a 'standard' style connector on air hoses, though I've found over the years that there are a couple different standards they use. One for typical air nailers and such, one that commercial shops use. They look very similar but are not interchangeable! Not sure what names to look for on the connectors for each type, hope someone else here can chime in on that.What I do a lot for connecting to the models is to get a multi-pack of the air hose quick connect fittings, and turn the ends to be like a barbed hose fitting, put the plastic hose over that, and add a turn or two of wire with a twist to hold the hose. A lot depends on what hose you are using out at the model. If you get the solid brass quick connect fittings, they are easy to drill/turn and solder to, to make up whatever you need. More recently I picked up a kit of push-to-connect fittings for 1/4" OD air line, and am going to convert over to using that, so I can run lines around the shelves to all the models to run them without having to move bigger hoses around, but I have not gotten started on that process yet.
FYI:This link to McMaster-Carr provides a good reference for fittings:https://www.mcmaster.com/products/quick-disconnect-hose-couplings/Regarding Valves, search for "Needle Valves." they provide a very controllable option for the kind of flows to be used with air-powered models. I have a needle valve with a quick-release coupling on the input side for attaching to my shop air line and a barbed fitting that I turned myself on the output side for connecting to an engine.
Happy to report the compressor is really quiet. I'm thinking of getting one of these 1/4" connectors to plug directly into it then just run silicone tube from there to engines/manifold- sound reasonable?