Originally Posted by oldred
If that compressor is bleeding down to zero (or nearly so) every night you should find out why and stop it, probably a simple shut-off valve at the tank will do it.
What Red says, a valve would be a good way to stop this drain down. Another thought, if you have a few leaking hoses, these hoses probably aren't far from total failure. Blow a hose, have the compressor run continuously until someone shuts it down can't be a good thing. I shut mine down EVERY time I quit for the day. Thevalve would be good insurance for the forgetful.