[PSUBS-MAILIST] automatic valve

[Sean T. Stevenson via Personal_Submersibles]

Valves at the bottom (inlet side) of the MBTs. A lot of Russian subs used these, because on the massive military subs the fully blown MBTs ended up being under considerable pressure just because of the depth of displaced water at the bottom of the tank. Subsequently venting from that condition is unnecessary violent / noisy, and it takes additional time for the trapped air to escape. After fully blowing the MBTs, the Kingston valves are closed, and then the MBTs are vented to atmosphere. This drops the internal air pressure, so that when diving, both top and bottom valves are opened and the MBTs fill rapidly and the sub dives faster.

Sean

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-------- Original Message --------
On Oct. 24, 2020, 18:10, hank pronk via Personal_Submersibles wrote:

> Sean,
> I though the same thing to just stack two valves together. I just don't know if that is bullet proof. I need to Google what a Kingston valve is.
>
> Hank
>
> On Saturday, October 24, 2020, 11:27:57 AM MDT, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> I'd be inclined to look at the feasibility of plumbing two normally closed vent valves in series, requiring you to actuate both simultaneously in order to flood.
>
> Not sure what your sea inlets look like on your MBTs, but if your vent outlets reach beyond the sea surface to air when in the fully surfaced condition, the addition of Kingston valves on the inlet side could also serve the redundancy function. Adding Kingstons would also potentially allow you to continuously monitor for leakage, as the MBTs could then be nominally held at positive pressure with respect to ambient until you were ready to flood.
>
> Sean
>
> -------- Original Message --------
> On Oct. 24, 2020, 09:57, hank pronk via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>
>>
>
> Hi All, I am looking for a safety back up on my solenoid vent valve. I envision an upside down foot valve. I want a device that blocks the air flow from the MBT once submerged. This is in case the solenoid valve gets debris in the seat and fails to seat. I only need one auto blocker because I have two MBT's. I can make buoyancy adjustments with the second tank. A float that closes a valve sort of thing
> Hank
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