Compressor check valve question

[Fyrme]

Ok, got a Q. I am in the process of re building my compressor. I got a donor tank since my 80gal got a hole in it. I have a question about the tank fill line. The compressor pump I am using from my original setup has a 5/8" copper supply line going into a 1" bung that houses the check valve. The tank I am using only has 2 1/2" bungs in it as well as the 2; 2 1/2" plugs on the side of the tank. Will I cause too much head pressure on the pump if I use the new tanks check valve? There is a huge size difference between the two. I see there are 1/2" cv's that are good for up to 20cfm available, I just have no idea what the one I have is rated for. My current pump and motor was putting out 16cfm on my old 80gal tank. The new tank had a label on it that said 12cfm.

Also, what is this piece called? It was screwed in just below the pressure switch in a T.

 

[Fyrme]

Just found out what the bottom pic is, an adjustable relief valve. Which is frozen into its current position.

 

[mr-compressor]

For the check valve, I think it would be better to use the smaller original one and install it with a reducing socket onto the new tank.

 

[nehog]

If the new one is the silver one on the right, I'd probably use it, it appears to be larger and better.

 

[Tim The Tool Man]

It doesn't seem to me that you have any choice but to go with the smaller inlet/check valve of the donor tank. I doubt the head pressure build up you are concerned about will really be a problem. Just monitor it the first few cycles after it is rebuilt...

 

[Fyrme]

The smaller check valve worked fine. I consulted a shop before plumbing it up

 

[Kevin C]

Wow.. Looks great!