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PostPosted: Fri Aug 19, 2016 6:26 am 
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Location: Somewheres near the Atlantic
If anyone done this before could you let me know how deep you went into the valve body when you drilled. Out of all the info I found online I never could find how deep they drilled into. If someone with experience could tell me that would be great.

Thanks


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PostPosted: Fri Aug 19, 2016 10:07 am 
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Location: Coalmont BC
It depends entirely how much pressure you are intending to run, whether any particular method of pinning the valve is safe.... I always use a Disco valve, which has holes drilled and tapped for three 8-32 screws, and drill the tube properly to accept the heads of the screws, so that all three screws are accepting equal loads.... Done properly, that valve installation is good for 2000 psi, which is the MSWP for the Disco.... There are some concerns about the roll-stamp area on 22XX tubes as the depth of the lettering varies greatly.... I have seen some which are so deep, there are marks on the inside of the tube.... The best practice would be to use an extended valve front end where the O-ring sealed to the tube in front of the roll-stamp so that area is not under pressure.... If you are using a regulated tank, make sure the output side of the regulator has a 1.8K burst disc to insure the pressure inside the gun never exceeds 1800 psi, even if the regulator fails....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
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PostPosted: Fri Aug 19, 2016 11:23 am 
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rsterne wrote:
It depends entirely how much pressure you are intending to run, whether any particular method of pinning the valve is safe.... I always use a Disco valve, which has holes drilled and tapped for three 8-32 screws, and drill the tube properly to accept the heads of the screws, so that all three screws are accepting equal loads.... Done properly, that valve installation is good for 2000 psi, which is the MSWP for the Disco.... There are some concerns about the roll-stamp area on 22XX tubes as the depth of the lettering varies greatly.... I have seen some which are so deep, there are marks on the inside of the tube.... The best practice would be to use an extended valve front end where the O-ring sealed to the tube in front of the roll-stamp so that area is not under pressure.... If you are using a regulated tank, make sure the output side of the regulator has a 1.8K burst disc to insure the pressure inside the gun never exceeds 1800 psi, even if the regulator fails....

Bob


1600-1800 PSI MAX is what I'm planning on running.


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PostPosted: Fri Aug 19, 2016 4:32 pm 
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Fasten the valve like a Disco.... you are dealing with nearly 800 lbs. of force at 1800 psi....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Fri Aug 19, 2016 5:45 pm 
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Location: Somewheres near the Atlantic
rsterne wrote:
Fasten the valve like a Disco.... you are dealing with nearly 800 lbs. of force at 1800 psi....

Bob


Yes I know. I'm asking to whom that pinned their valves how deep did they drill into there valve body for the screws.


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PostPosted: Fri Aug 19, 2016 6:55 pm 
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Location: Canada
Can go .200" deep in a 22xx valve without causing issues. Stick with a fine thread and quality fastener.

This may or may not be of help...

topic69553.html

Al


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