[PSUBS-MAILIST] Piston pressure regulator

[s ï l k y N?³ <silkyfx@hotmail.de>]

Hey,

I have posted a picture on moki. It shows the basic principle of a methord 
that could be used to regulate (three things) (1) the air pressure 
difference between water and in hull. (2) Vent air out of an ambieus sub. 
(3) automaticaly bring the sub back to the surface if it goes under a preset 
depth (too near crush depth or Air related depths)

(example) the idea is 1 lubricated water proof piston with two open sides. 
one open side exposed to the outer water pressure and the other to the 
inside pressure. The displacement from its central position due to presure 
difference is used to open - close two valves. one valve leads to the 
breathing air suply the other (2) IS the air out vent.(link to image at 
bottom)

Adjustable spring(s) could be used to controle the sensetivity of this 
system. This could if implimented correctly be used to reduce the 
probability of the piston bouncing up and down effect and reduce the amount 
of air wasted due to small vertical movements.

How to use this as an emergency system (3) one could for example use a 
stiffer spring to encrease the pressure needed to activate a valve and 
increase the distance the piston must move before the valve is activated. In 
this case the activated valve would be a secondairy blow ballast valve.

I have scribles, notes & workings If you want more info.

thnx			silky

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