Air valve not closing

Hi all,lithrone 526 got some air valves not closing so compressor working overtime. Any ideas as to sort it ? Will i have to take the whole block apart? Cheers Dave

 

Do you know which valve, and what it controls?

 

No Vic.because a valve is open the air comes out the top of the block!

 

It may not even be the valve that's leaking and the actual cylinder it controls… I would try and isolate which valve… stop the press and lower the air pressure to that block, then starting from the bottom of the block remove one air line at a time (the return side which in my case is the left side of each valve) you should not have any air coming out of the line, or the valve. I'm attaching an image of the valves and what they control again for my press.. Yours will probably be different.