Origin unknown, i beleive the reason your QEV failed is because it is a diaphram type.
the one you bought its a "poppet" type, wich uses a polycarbonate disk, aka why it can take so much pressure.
the ones from MCmaster should be able to hold 300 right?
the "Victory" copper QEV rifle
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origin unknown
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This Is why it doesn't work now...
I took apart the QEV to sand down the sealing face so it would seal a little better at low pressures. I put it back together, but in the process I tightened the screws a little too tight and stripped the threads where the screws go in. Usually I overtighten alot of things for I am slightly compulsive. Now the air leaks out around the screws and the qev is totally useless unless I pour molten aluminum to fill the screw holes and then re-drill them. I don't have the equipment to this though...
I took apart the QEV to sand down the sealing face so it would seal a little better at low pressures. I put it back together, but in the process I tightened the screws a little too tight and stripped the threads where the screws go in. Usually I overtighten alot of things for I am slightly compulsive. Now the air leaks out around the screws and the qev is totally useless unless I pour molten aluminum to fill the screw holes and then re-drill them. I don't have the equipment to this though...
Ecclesiastes 1:9 - What has been will be again, what has been done will be done again; there is nothing new under the sun.
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unisonmind
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Why don't you just drill and tap the holes one size bigger then the current bolt?
THE DIFFERENCE BETWEEN A FLOWER AND A WEED IS A JUDGEMENT
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daberno123
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or if you don't think you'll ever want to take it apart again you could just fill it with epoxy
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origin unknown
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Unison: I would do that, but I cant use my Dad's drill press. I dont want to mess anything up either by using a normal drill.
Ecclesiastes 1:9 - What has been will be again, what has been done will be done again; there is nothing new under the sun.
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stevenarroyo
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why did you put a valve after the plowgun? 
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Gippeto
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The ball valve is acting as a "safety" .
This information was in the first paragraph.
This information was in the first paragraph.
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.