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 Post subject: Scuba tank yoke leaks
PostPosted: Sun Apr 21, 2013 9:25 am 
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Location: st catharines ontario canada
It seems everytime i try to fill my small hpa tank the air comes out around the yoke..it is a kvalve on the tank and ive replaced the oring twice now..the fill station is made from extreme rage and its new...anybody else have this problem and a solution??

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PostPosted: Sun Apr 21, 2013 9:33 am 
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Are you sure your tank has a k-valve? There are others that are very similar but IIRC a tad smaller. Maybe an L-valve?


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PostPosted: Sun Apr 21, 2013 9:38 am 
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Try a few different o-ring sizes.


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PostPosted: Sun Apr 21, 2013 9:42 am 
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Try to post a pictures seperatly of the Scuba thank valve and the Yoke...
Because as the post above stated, yes it might be a "J" valve
http://www.google.ca/imgres?imgurl=http ... x=71&ty=61

And a "K" valve
..http://www.google.ca/imgres?imgurl=http ... =168&ty=69

Will try to help...

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PostPosted: Sun Apr 21, 2013 9:48 am 
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Silicone grease on the O ring? if not, it might be easy to snag and tear an O ring with a dry, possibly nicked tank ring. I would check the tank's ring for being smooth.

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PostPosted: Sun Apr 21, 2013 10:22 am 
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Location: st catharines ontario canada
here's some pics of the valve and fillstation
Image
Image
Image
Image

the model of the valve is ..SQ-7 BBB NERINI..which i cannot find any information on..that is not the original oring in the pic as ive been trying different ones now

thanks for the help

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PostPosted: Sun Apr 21, 2013 12:23 pm 
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Suppose you got the "O" ring from a dive shop?
You could at the dive shop, also get some Silicon paste/lube, a little dab-a-do is great.
Also the yoke you have, have to be really tight because you are hanging the HPA thank off it, when charging.
Sometimes it is easier on the yoke if you have a "Hose/Whip" of a good length, to not put pressure on the yoke itself.
That is all can think of...

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PostPosted: Sun Apr 21, 2013 12:56 pm 
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Location: P.G. B.C.
2240mod wrote:
Suppose you got the "O" ring from a dive shop?
You could at the dive shop, also get some Silicon paste/lube, a little dab-a-do is great.
Also the yoke you have, have to be really tight because you are hanging the HPA thank off it, when charging.
Sometimes it is easier on the yoke if you have a "Hose/Whip" of a good length, to not put pressure on the yoke itself.
That is all can think of...


Hadn't thought of that, but with a weight hanging on the yoke, it could increase compression of the O-ring enough on the bottom radius to cause leakage around the top radius. The surfaces look just great.
I put grease on mine, then as I finish tightening the yoke onto the tank I turn the yoke in the direction of the thread, to get an even tighter fit. This is due to wear on the old tank's old O ring. Works a treat.

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PostPosted: Sun Apr 21, 2013 5:11 pm 
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Location: st catharines ontario canada
It seems the air is comming out the vents on the fillstation....any ideas??

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PostPosted: Sun Apr 21, 2013 5:51 pm 
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There is really no vent on the Scuba Tank, but there is a burst disk. The "Burst Disk" is not raptured because there is still pressure in the Scuba Tank.
Is it venting from the Yoke?
The yoke should also have a Burst Disk for protection. It may be that the Burst Disk is raptured on the yoke assembly.
Also, have you checked the pressure relief Screw seal?
Good unscrew the relief screw completely and when out, take a close look to see if there is a foreign object that is on the seal or inside on the valve seat. Yes sometimes there is muck inside and will bleed off pressure.
Also check if the burst disk is gone...
Another tip..get some soapy water and try to narrow down by the escaping bubbles exactly where it is leaking...
Good Luck

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PostPosted: Sun Apr 21, 2013 6:11 pm 
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Location: st catharines ontario canada
yes its leaking from the vent on the yoke just under the gauge...bleed screw problem maybe?? there seems to be some sort of material on the tip of the bleed screw...when i firsrt hooked the yoke up and tried to fill the 13cu bottle it made it to 1200-1300psi and started leaking from the vent on the yoke and now wont fill past 4-500

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PostPosted: Sun Apr 21, 2013 8:05 pm 
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get a spray bottle with some water and a little dish soap in it shake it a bit and spray it around where you think its leaking and you will see a bubble form form the exact location and determine exactly where its coming from this is a great way to determine and find leaks:wink:

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PostPosted: Sun Apr 21, 2013 9:38 pm 
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Location: st catharines ontario canada
Its comming out the vent hole on top right beside the gauge...only thing i can think of is that the seal on the bleed screw must be shot so i'll try to make another and let you's know how it turns out..... thank you's all for the help

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PostPosted: Sun Apr 21, 2013 11:48 pm 
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Drive the roll pin out of the fill station and change the o ring. Once you remove the pin the piece will come out and you will see a o ring.



George


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PostPosted: Mon Apr 22, 2013 6:01 am 
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Yes, it sounds like you have a bad "Bleed Screw" sealing of some kind. The vent hole on the yoke, must be the exit point when the bleed screw is backed out.
Found out that some people really tighten the bleed screw in, but after some time it brakes down. Just tighten it in and if it vents, tighten a bit more.
Well you seem to have the problem pin pointed. Hope you will be up and pressurizing tanks.

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Arsenal..
Kraft Marshmallow Pump and Shoot Rifle.
GoodYear Gatling Gun rubber-band shooter.
PEI Potato PCP Rifle.

Glass ..12" Dobsonian Reflector.
Shooting for the Stars.


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