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Old 05-18-2008, 10:25 AM   #1 (permalink)
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Son of Sheridan Valve Questions: Hot Valve?

My Sheridans won't shoot when the 'gun body gets really hot .

I looked for a thread on this here and PGPOG, but might have missed it--sure seems to have happened to me a lot over the years. I suspect Crash knows this one from part of an answer follow-up he gave in the Sheridan forum.

When it's 90+ degrees out here in Cali and I'm using CO2 or 12-grams, chances are good that the 'gun will fire very slow--or in some cases not at all--with a lame "pop" sound not unlike that of a first-shot 12-gram pierce.

Dialing up velocity does no good, but HPA seems to fix it. My theory is that the CO2 is over-expanding in the chamber and locking the valve, but I'm no 'gun tech.

Anybody with answers / similar experiences?
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Old 05-18-2008, 11:01 AM   #2 (permalink)
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Ding, ding.....we have a winner.
Sounds like you are experiencing the same problem as you would in a cocker or other gun that uses a on gun reg, when the reg craps out or is set too high. Basically there is so much pressure on the back of the valve it is "locking" the cup seal and the main spring doesn't have enough force to open it far enough to get a shot at velocity.
About the only thing I can recommend is getting a heavier main spring. Hope this helps!
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Old 05-18-2008, 11:16 AM   #3 (permalink)
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seems to be happening to my friend's 97 RF sniper... solution, do we get a reg kit onto his sniper? (no reg yesterday, 100+ degrees, it was doing fine with 3.5 until a few hours later....makes me wonder)
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Old 05-18-2008, 12:49 PM   #4 (permalink)
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Quote:
Originally Posted by CamoDeafie View Post
seems to be happening to my friend's 97 RF sniper... solution, do we get a reg kit onto his sniper? (no reg yesterday, 100+ degrees, it was doing fine with 3.5 until a few hours later....makes me wonder)
Was the tank just filled or was the weather cooled when y'all started playing? If so then yes sounds like the same problem and yes a good reg would help. That is the problem with unregulated Co2 as the temp rises the pressure in the tank and the gun goes up. The end result is either a gun shooting way hot or the valve locks and it will not shoot.
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Old 05-19-2008, 10:05 AM   #5 (permalink)
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Brass N Wood Fan
Palmers Fan
For the sniper.

HP Low Turbulence Valve Assembly - Sniper [PPSP041S] - $39.00 : Palmers Pursuit Shop!, Where Custom Still Means Something

A reg will work better, but if your options are limited, then I suggest this valve for the sniper.


The Sheridan will need one of:... Reg, longer main spring, or a Velcotiy adjuster. Thats exactly why the Pyre has a reg built in.

Some overfilled 12 grams on a hot day can reach 1200 psi.
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Old 05-20-2008, 12:42 AM   #6 (permalink)
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Quote:
Originally Posted by CraigPalmer View Post
...The Sheridan will need one of:... Reg, longer main spring, or a Velcotiy adjuster...
Okay, I'm a believer. Come to think of it, I haven't had one of your reg'd Houndstooths go out on me during a hot day--so that's my next heatwave road test right there.

Thanks!
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Old 05-20-2008, 01:09 AM   #7 (permalink)
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I'm looking at the sheridan 12g. version of the dyna valve..are they not shaved down now?
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