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[hank pronk via Personal_Submersibles]

 Alec,Thank you, I am pretty pleased with it.  I am concerned that the water pressure may be too much for the thin SS wall of the cylinder.  There is a very small air space below the piston that would be at atmosphere, as well as the air feed line.  Originally I was thinking about a bleed port and that would solve the problem.  I am not liking that idea.  Then I thought the seal would let water go by but testing shows it won't.The solution is a compensator.Hank
    On Friday, December 21, 2018, 6:22:22 PM MST, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Now that looks really presentable! But I’m not understanding the issue with the low pressure side. Why would that need protecting, is it not open to the sea?
Thanks,Alec




On Dec 21, 2018, at 5:56 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


 Hello fellow sub nerds.  After do some total destruction testing of my prototype vent valve - I have decided to replace the plastic top with an aluminum disk.   Also I had to pressurize the air cylinder until it exploded before the piston seal would leak.  I was hoping it had a weaker seal so that the cylinder would be self protecting from water pressure.  The test shows that a compensation system needs to be added to protect the low pressure side of the piston.  No problem - I will mount a second small air cylinder in the air line to act a compensator.  I now have three valves built and ready to install.Hank
   ----- Forwarded Message ----- From: hank pronk <hanker_20032000 at yahoo.ca>To: hank pronk <hanker_20032000 at yahoo.ca>Sent: Friday, December 21, 2018, 3:49:20 PM MSTSubject: 
 



Sent from my iPhone  

<IMG_0253.jpg>

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