Usually the fully charged gun is capable of shooting two mags and still stay in green zone of tank pressure gauge. But if you continue shooting and let the pressure drop below the certain value (just a bit into yellow zone) the gun releases all remaining air. Is that normal/typical for this gun, Hatsan or any unregulated PCP? I don't have other PCP guns without regulator, and I never shot them out below the regulator pressure.
Hatsan Velox releases all air when shot to the yellow zone
- Thread starter adknives
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I had an Evanix Air Speed semi auto the did that. It's a huge problem with a semi auto. Scared the poop out of me first time it happened. It also destroyed the baffles. I was careful to count shots after that.
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I must preface this with I don't know the gun, I don't know it's quirks....
To me this sounds like the valve system is tuned for a specific pressure range and that when you hit that low pressure threshold that the valve may be able to travel far enough that it is no longer having air assist in its closure and the airflow becomes so significant that the valve is happy to stay floating open and dump what's left.
Maybe there's supposed to be a return spring and something has happened to it, maybe there isn't one.
Just some theory that ran thru my head.... I hope you get it figured out. Happy shooting.
To me this sounds like the valve system is tuned for a specific pressure range and that when you hit that low pressure threshold that the valve may be able to travel far enough that it is no longer having air assist in its closure and the airflow becomes so significant that the valve is happy to stay floating open and dump what's left.
Maybe there's supposed to be a return spring and something has happened to it, maybe there isn't one.
Just some theory that ran thru my head.... I hope you get it figured out. Happy shooting.
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I can't tell right now, the gun is with another guy. Now he can't charge it by manual pump, valve is open and won't close (need a good kick of pressure), so he can't recreate the issue. The gun is being shipped back to me. I will play with it and report in few days.
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I have the velox and this doesn’t happen to mine. If I shoot the pressure too far down, it doesn’t have enough of pressure to cock the hammer back and it bounces a few times in rapid succession. Mine never dumped all the air and I also don’t have an issue filling an empty tube without a quick burst of air. I wonder if your valve broke, I would check there first.
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Its normal on some semi autos. My s45 will supposedly dump all the air if you operate it below 2200 psi. There's not enough pressure to close the valve.
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Likely cause is that the design has a LOT of hammer spring tension placing a high static pressure against poppet stem. As pressure within gun reduces so does the force holding poppet closed. Get near the tipping point of air pressure holding valve closed and the mechanical pressure of wanting to open it .... Air in tank goes woosh !!! Or you start to get heavy hammer bounce.
Tho said, this is in play as well,
Now a worn poppet that needs a lot of pressure to seal up well will start weeping as pressure falls away ( Tank dump at some point ) where as a good poppet that seals well even upon filling may bounce at low pressure but does seal up when the stutter of a bounce event diminishes.
JMO ...
Tho said, this is in play as well,
Now a worn poppet that needs a lot of pressure to seal up well will start weeping as pressure falls away ( Tank dump at some point ) where as a good poppet that seals well even upon filling may bounce at low pressure but does seal up when the stutter of a bounce event diminishes.
JMO ...
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