[PSUBS-MAILIST] Solenoid valve

[Alan James via Personal_Submersibles]

 James,I have attached a solenoid valve design based on Vance's  pneumaticallyoperated top hat ballast valve. It was done quickly & is open comment & being evolved.   A solenoid is just a coil of wire with an iron core plunger. As long as the solenoid& plunger are coated with epoxy or similar this simple design should work.The solenoid is clamped in place by the two circular plates & the retaining bolts.(didn't put thread on the bolts) The neoprene gasket seals on it's seat by the springspressure & air pressure in the ballast tanks. when power is on the solenoid itdraws the plunger in to it, which pulls the gasket seal open.A solenoid is easy to make but it may take some experimentation to get the right gauge of wire & number of windings, so that it opens the valve but doesn'theat up excessively.The other neoprene gaskets shown are for sealing to the hull.Some sought of gauze needs placing round it to stop foreign matter gettingin the valve seat. Alan
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