03-21-2014, 11:09 AM
Mine had a check valve but it wasn't holding pressure so I replaced it. With the check I think it makes it easier for the compressor to start up. I got it on Amazon but Grainger, etc. should have one. It is just a spring loaded 1/4" NPT female check valve. Just make sure you mount it with the arrows pointing away from the compressor 
http://www.amazon.com/gp/product/B000R88...UTF8&psc=1
The SMC filter I have is a NO (normally open) and if I were to do it again I would probably use a NC (normally closed) one.
http://www.amazon.com/dp/B0078SE31O/ref=biss_dp_t_asn
The NO one needs 15psi in order for it to seal off so the compressor is just bleeding air until the filter seals off. Putting the check valve upstream of it keeps the pressure high enough so that it doesn't open. It's just a simpler way to accomplish what the solenoid does. And cheaper too. Cindy keeps me on a pretty tight budget............
http://www.amazon.com/gp/product/B000R88...UTF8&psc=1
The SMC filter I have is a NO (normally open) and if I were to do it again I would probably use a NC (normally closed) one.
http://www.amazon.com/dp/B0078SE31O/ref=biss_dp_t_asn
The NO one needs 15psi in order for it to seal off so the compressor is just bleeding air until the filter seals off. Putting the check valve upstream of it keeps the pressure high enough so that it doesn't open. It's just a simpler way to accomplish what the solenoid does. And cheaper too. Cindy keeps me on a pretty tight budget............
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
PO 1999 Foretravel 36'
1998 Newell 45' #486
1993 Newell 39' #337