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Old 02-18-2011, 06:38 PM   #1 (permalink)
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Leak in rear of classic valve

So i just got my classic valve, lvl 7 mag. However, it is leaking out of the back at under normal firing pressure. the input tank hasnt been messed with, so most likely it is putting out around 800 psi. I have already replaced all the o-rings and oiled it up. It is interesting to note that it stops leaking with the trigger held in.

Ive tried everything i can think of and everything i found looking around on the internet and this forum, and it looks like i might need a new regulator piston assembly. Is there anything else that i should try first, and will a new regulator piston assembly fix my problems?
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Old 02-18-2011, 08:22 PM   #2 (permalink)
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If the leak stops when you hold the trigger, your leak is past the on/off top o-ring.

Examine your on/off bottom o-ring. If that is bad, your leak will actually be coming out of the bottom of the valve, between the body and the rail. Soapy water or windex will help you identify the location of the leak.
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Old 02-18-2011, 08:54 PM   #3 (permalink)
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Or you can just dunk the whole gun in a bucket of water to test for leaks
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Old 02-18-2011, 09:56 PM   #4 (permalink)
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Originally Posted by ta2maki View Post
Or you can just dunk the whole gun in a bucket of water to test for leaks
Sounds like an idea.

I thought it might be the on/off, but i checked that three or four times. ill take it apart and put it back together again and see what happens.
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Old 02-19-2011, 03:04 PM   #5 (permalink)
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Check your velocity. When the velocity is turned up too high, it's designed to leak out the back. If it's oiled, gas it up, stick a wrench into the adjuster and back it out slowly. Using an on/off is safer, though. I had to shoot one of mine when I did it. I'm guessing it had to clear it out.
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Old 02-20-2011, 01:02 PM   #6 (permalink)
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Originally Posted by b-cuzz View Post
Check your velocity. When the velocity is turned up too high, it's designed to leak out the back. If it's oiled, gas it up, stick a wrench into the adjuster and back it out slowly. Using an on/off is safer, though. I had to shoot one of mine when I did it. I'm guessing it had to clear it out.
It was leaking at 290. so theres something wrong. I need more air before i can test it under water.
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Old 02-21-2011, 07:25 PM   #7 (permalink)
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Remove the regulator Piston. Clean it, and the inspect/change the oring. If that doesnt work then replace the piston.
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