Re: [PSUBS-MAILIST] MBT Vents

[Jon Wallace <jonw@psubs.org>]

One of the K350 owners can speak to this better than I, but essentially 
George fabricated a "typical" o-ring based thru-hull with a rotatable 
shaft.  That shaft (which goes through the thru-hull) is attached to the 
valve stem on the outside.  To think of it another way, he took the 
handle off the valve stem and then attached an "extension" that went 
through the thru-hull sleeve.  Obviously a bit of fabrication involved 
so I can understand how having the valve inside the cabin would 
represent less work since you only have to punch two holes through the 
hull and weld back in a couple of pipe fittings.

I can't help but wonder if it would be possible to use a manifold 
arrangement of interior valves and use the same pipe for adding air to 
the ballast tank, for release of the air.  You would still end up with 
only one penetration in the conning tower and the added benefit of no 
exterior pipe.

Jon


ShellyDalg@aol.com wrote:
> How is the valve handle sealed at the point where it penetrates the 
> hull ? I've seen both configurations but couldn't see how the handle 
> penetration is sealed.
> Frank D.




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