Thread: Walther venting
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  #20  
Old 7th May 2014, 08:15 PM
hmangphilly hmangphilly is online now
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Join Date: Nov 2013
Location: wimborne
Posts: 625
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Chaps ,
I haven't described the test very well .
Effectively I've attached an air line at 100psi to the muzzle.
With the probe closed , firing valve is deliberately in the closed position by resting against the dry fire pin .

Thus the pressurised. Areas are :
Barrel , probe orifice, transfer port, and the small chamber to the hammer side of the firing valve.
The valve is closed to eliminate the reg from the test . As all I want to test is the valve stem .

The barrel seals and probe seal are all fine. No air can be heard escaping and a further test by dusting with talcum powder and firing a pellet confirm this.
The only escape route for the compressed air is the unsealed valve stem .
The gauge is academic really and just gives a value to the leak.

I don't having the firing valve in the open position will make any difference. The amount of lift to the valve upon striking with the hammer, I would say is a tiny amount. Max 0.5 mm I'll try and measure but it is tiny compared to the amount of stem in the drilling of. The action
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