Further question on relieving regulator
by Jim C.
Sirs:
Our air conpressor's tank has a on timed autodrain connected to the bottom to remove condensation. At the end of the day, the compressor is shut off. The timed drain keeps working, very slowly depressurizing the tank. However we usually have at least half pressure in the morning.
The old output regulator failed. We were sold a replacement regulator of the relieving type. Will it try to vent the ouput side to match the falling input pressure?
Bill says...
Howdy Jim.
A regulator's purpose is to reduce the pressure from the tank to the desired pressure level for the downstream application.
If the supply pressure is 100 PSI, and you set the regulator to 60 PSI, then the downstream air pressure will stay at the 60 PSI, regardless of the upstream pressure.... unless....
If the upstream pressure falls below our 60 PSI setting, then the regulator can't increase the air pressure, and the downstream pressure would then be whatever the upstream pressure was, as long as the upstream pressure stayed below the 60 PSI.
If the regulator is set for 60 PSI, and the downstream pressure falls below that 60 PSI, the regulator will increase the flow to the downstream side in order to raise the pressure.
If your compressor is on, and the downstream pressure drops, then the regulator will open further, the upstream supply pressure will fall, and your compressor will turn on until it raises the pressure in the tank to the cut out level.
Does this help?
Cheers,
Bill
