Different type cornelius lids

[svr]

Recently I bought cornelius kegs. Mix lot ball lock and pin lock.
I come across few types of keg lids for the first time.

Understand that this one is for carbonization in keg.
second one is with automatic relife valve. Can this be used for keging?

and last one without valve?

 

[FloppyKnockers]

Circle and racetrack are the two common types of lids used with corneys. The PRV (pressure relief valve) is designed to relieve pressure when it reaches the maximum operating - about 130 psi. That said, you could use the PRVless one and rely on your regulator for that part of safety. The one with the homebrew fitting is for carbonating. The automatic valve can also be used for our intended purpose.

 

[svr]

Is the third lid without any security valve?
How to clean sanitize automatic valve?
tnx

 

[Hoppity]

Just use a punch/screwdriver in the gas in port for the last two to release pressure. Cleaning the auto pressure relief valve is simple since nothing ever passes through it until it "pops": I clean with brush, rinse then soak in sanitizer.