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PostPosted: Thu Aug 01, 2013 2:39 am 
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Location: Victoria, BC and Clarkston, WA
Does this look right for a HPA valve conversion for a 2240?
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Thanks guys! My big question is where to buy and what size O-rings do I need(catalog #). My physical dimension is .750 OD, .06 groove diameter and depth.

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Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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PostPosted: Thu Aug 01, 2013 5:35 am 
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I'm not Bob or Walter, but to me Rick, it looks like your valve front is not long enough to cover the roll stamp on a 2240/60. If it is the same length as a Disco valve front it WILL be long enough for a 2250, but not a 2240.

I could very well be wrong, but I think a #113 o-ring should work fine (but you may want to get confirmation on this from somebody more qualified than me!)

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PostPosted: Thu Aug 01, 2013 6:31 am 
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Thanks Todd! I probably should pop it in and make some measurements!

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-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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PostPosted: Thu Aug 01, 2013 9:52 am 
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Location: Alberta Canada
Morning Rick. A the measurement I have. The bulk end is 1,2" in length not counting threads and a #113 oring.

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PostPosted: Thu Aug 01, 2013 10:00 am 
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Location: Coalmont BC
Your OD is on the large side if you are at 0.750".... The 22XX /Disco tube is 0.875 OD x 0.065" wall, so the ID is 0.745".... Crosman make their valves about 0.735", although that's marginal for using a 70 Durometer O-ring, they tend to extrude (but that may be Crosman's idea of a safety valve?).... The comments about covering the roll stamp are valid, it's a good idea, particularly if you are going to run pressures where you can't protect the gun with a 1.8K burst disc.... I usually incorporate my gauge mount in the valve front end and then it does all three jobs, seal, cover the roll stamp, and mount the gauge....

Crosman use two # 016 O-rings.... I often copy that, or use a single # 113 (but that cuts down on the ID possible).... If I'm cramped for room, I use a single # 016....

If the front of your valve is too short, you may have trouble with the front trigger mounting hole in the tube.... Crosman turn a groove in the Disco front end to clear it, and that is the reason it is longer.... I don't see any provision for that in your valve front.... in fact aren't the O-ring grooves right where the screw is?....

Bob

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PostPosted: Thu Aug 01, 2013 4:41 pm 
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It was my first attempt AND I didn't have the main tube with me to do any fit checks! I will tonight if I have time at work!

Thanks for the input, Gentlemen!

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-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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