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Re: [PSUBS-MAILIST] MBT valve

Nice cad work. Mine is simpler. #2 pencil and a yellow pad. Not as pretty, though.

My valve is different in a couple of ways--mostly that there is a captured gasket on top of the piston AND a gasket under the flange, so they go rubber to rubber, so to speak. It's sort of a belt & suspenders approach, and we'll have to see just how well it works out. At any rate, it is coming along, so I should have something to test before long. We ought to be finished cutting parts this week and then build it next week, so photos to follow. Once you see them (as the swami said) all will be clear. I'll test the raw valve (prior to anodizing) and we'll get that on the web as well.

The cue ball is on the back burner, but I've got a bud who owns one of those wonderful tool & dye & welding & fabrication & design shops (you know, think it up, they can do it--I love places like that). He's got something in mind for our rotary joint. I'll stick him with a pin this week when I see him and see if we can't get that going right after the valves. I need all of that for my sub, anyway, so now's the time.

Vance


-----Original Message-----
From: ShellyDalg@aol.com
To: personal_submersibles@psubs.org
Sent: Sat, 17 Jan 2009 1:10 pm
Subject: Re: [PSUBS-MAILIST] MBT valve

Hi Vance. Ya, it doesn't seem that complicated to me. I updated the little sketch I had posted earlier so here it is. The only "close tolerance" parts are the rod and bushing. Both "off-the-shelf" parts. The rest is made from just flat plate and welded up. With the gasket on top, the sand just washes away. Where the gasket is shown, I made a little pocket for it to sit in, but that's probably more complicated than it needs to be too. Anyway, I look forward to seeing your valve. Made any headway on the "cue-ball" thru-hull? I haven't given up hope on that idea yet. Frank D.
http://www.frappr.com/?a=viewphoto&id=1578526&pid=10794583&myphotos=1