Check valve installation

by Al
(Newark, Oh)

Hi,
I am installing a commercial compressor onto a new tank. My question applies to the check valve. Is it acceptable to install the 3/4 inch check valve into a 1" or 1.5" pipe or does it have to be installed directly into the tank?

My tank has 1.5" bungs so I could use a 1.5" to .75" bushing but I would rather bring a 1” pipe up and reduce it to .75 for the check valve. I am not sure if this would create too much back pressure on the compressor.

Thanks, Al

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Bill says...

Al, a check valve, or non-passing valve, will work in preventing compressed air back flow at the point it is installed. As long as where the check valve is installed is the point where you do not want back flow to occur, then installing it there is just fine; a the compressor discharge, in the line to the tank, or at the tank itself.

Do recognize that by introducing a .75" check valve into a 1" inch line, you are creating an air damn, which will reduce the flow of air downstream, through the tank, to the point of use.

If you can get enough air flow through a .75" line to the tank and ultimately to the equipment, no problem.

The check valve, in slowing the air, will not negatively affect the operation of your air compressor.

Cheers,

Bill