[PSUBS-MAILIST] Mushroom Valve?

[Alan via Personal_Submersibles]

James,
the saddle tanks don't look very substantial. Could you just seal
them & counteract the additional buoyancy with lead at the bottom
of the sub. Or use syntactic foam & additional lead instead.
Will add to the weight on the trailer, but shouldn't be that much
should it! How much buoyancy do you think you will get when you
subtract the weight of the tubes?
Vance gave us a design for a pneumatically activated valve at the 
Islamorada conference. I believe Cliff has copied one of Hugh's 
pneumatically activated valves.
I have been designing a solenoid valve based on Vance's design &
have been running my ambient with off the shelf solenoid valves.
This was not the most robust solution as they are subject to corrosion.
Alan


Sent from my iPad

> On 2/02/2018, at 5:53 AM, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> James,
>  
> The Drebbel has a lever operated 1 ½” ball valve.
> You could add a deck plate. This covers the valves, looks good with saddle tanks and is very usefull.
>  
> Br, Emile
>  
> Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens James Frankland via Personal_Submersibles
> Verzonden: donderdag 1 februari 2018 17:00
> Aan: Personal Submersibles General Discussion
> Onderwerp: [PSUBS-MAILIST] Mushroom Valve?
>  
> Hi All,
>  
> I am adding saddle tanks to Jodie B.  
>  
> Im not 100% sure what to do with regards to the vent plumbing.  I would like to ask if anyone has any advice? 
>  
> I am thinking of putting 2x through hulls on the top of the main pressure hull.  For and aft of the tower and then piping the vents to a valve that would operate through them.  Similar to the existing vents.
>  
> OR, fit the through hulls at the side so they penetrate the tanks and have a linkage of some sort that operates valves attached to the top of each tank, for and aft.  Some sort of mushroom valve??
>  
> Any ideas?  What have other people done?
>  
> <image002.jpg>
> <image004.jpg>
> ​
> ​
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