Re: [PSUBS-MAILIST] MBT Venting Options

[Jon Wallace <jon@psubs.org>]

Vance,

You're welcome to speak, but a white paper (with diagrams and 
illustrations) or photo journal would work best for getting the info out 
to the masses.  Using your camera to document each step in construction 
would be best.

Is your design similar to automotive engine valves where they seal at 
the top?  Or is the seal on the internal side of the MBT?  It seems like 
the spring compression value for keeping the valve closed will be 
important.  Am I correct that generally, you'd want a standing spring 
force equal to or exceeding the psi at maximum depth reached?  How did 
you calculate the strength of the spring you need for the valve?

Jon

> I'll have all that stuff ready before the convention, so maybe I can 
> get a little ten minute talk stuck in there on how to build these 
> things. It's a home shop item. In fact, I guess a hacksaw and a drill 
> would be enough, if you weren't interested in pretty. I wish we were 
> sitting around a coffee table, because two minutes with a pencil and a 
> napkin, and you guys would know exactly what I was talking about. I do 
> have a new computer with a scanner and a new camera with a cable, so 
> I'll snap some shots of the valves being built. We ought to be done 
> here shortly, depending on when the cylinders get here. FedEx is 
> pretty loaded down these days, but I'll post it soonest, whenever 
> soonest happens to be. Soon, anyway.




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