Here is an expert analysis of what let go in the PCP that "shot" the valve thought the guy's leg in that video:
https://www.gatewaytoairguns.org/GTA/index.php?topic=97121.msg907672#msg907672
This is like partially filling a room with propane and striking a match. The injury from this PCP has nothing to do with "industry standards for safety". It has to do with people keen on "making improvements" not having any clue about the physics involved. Nor the limitations of parts and materials, when not used as the designers intended.
The only thing that video demonstrates is how much energy is stored in 60 CC of air at 2000 PSI. But then, we already knew that a fully charged PROD can shoot pellets with a combined energy of about 400 FPE.
https://www.gatewaytoairguns.org/GTA/index.php?topic=97121.msg907672#msg907672
First of all, I'm glad that the guy wasn't killed, or injured more seriously than he was.... That could have been a fatal wound if it was over just a little bit.... WOW !!!
Now, let's analyze some of the things in the video.... There appear to have been (at least) TWO separate failures here....
1. They disassembled the back of the gun, removing the rear plug and the hammer.... The threaded end of the HiPac was still in the front of the tube.... Therefore, the Disco valve MUST have come out the back of the tube.... Why?.... See #2....
2. The tube does NOT have any side holes in it for the side screws in the Disco Valve.... Therefore, we can assume that only a single screw was used in the bottom.... They said that the gun let go when they were taking off the stock.... The stock screw sits in the slot in the Disco valve just behind the O-rings.... My guess is that the stock screw was taking part of the load, and when they undid it, all the load went on the bottom valve screw.... and BOOM, out the back of the gun it went, and through his leg....
3. I'm not a fan of HiPacs, but HOW in heaven's name do you use one with a Disco valve?.... They are designed to work with a stock 22XX valve, and seal against the valve, so that the tube is not under any pressure.... Did these guys cobble up some kind of seal between the HiPac and the Disco valve?.... or did they just use the HiPac to pressurize the tube (something it was never designed to do), and seal the Disco valve into the tube with O-rings?.... If they had a seal of some kind between the front of the Disco valve and the HiPac, and the tube wasn't under pressure.... then when the valve moved back a fraction, BANG the tube was pressurized, and that stressed the HiPac in ways it was never designed for....
4. Despite #3, how in heaven's name did the HiPac fracture at the threads, leaving the threads in the tube, and the HiPac imbedded in the ceiling?.... Is this a completely separate failure from the valve shooting out the back?....
Too many questions, and not enough answers.... However, I would say that whoever built that gun, using a Disco valve with apparently only one screw, must bear some of the blame.... If they had the valve sealed to the HiPac, the way it was intended to be, then did they have O-rings on the valve, so that it sealed to the tube?.... If they didn't, and the HiPac was only pressurizing the valve and not the tube.... then how did it develop enough pressure to shear the valve screw and fire the valve into his leg?....
Bob
This is like partially filling a room with propane and striking a match. The injury from this PCP has nothing to do with "industry standards for safety". It has to do with people keen on "making improvements" not having any clue about the physics involved. Nor the limitations of parts and materials, when not used as the designers intended.
The only thing that video demonstrates is how much energy is stored in 60 CC of air at 2000 PSI. But then, we already knew that a fully charged PROD can shoot pellets with a combined energy of about 400 FPE.
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