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In submarine technology a vent is a valve fitted to the top of a submarine's ballast tanks to let air escape from the top of the ballast tank and be replaced by water entering through the opening(s) called "flood ports" or "floods" at the bottom of the tank. In earlier times, the openings at the bottom of the ballast tank were fitted with ...
The tank is capped by a vent riser, a pipe coming out of the top of the tank that terminates at a Kingston valve. In the vent riser is a valve that when shut, prevents flooding the tank when the submarine is rigged for surface. When the sub is rigged for dive, this valve is opened and flooding the tank becomes an option.
The valve is immediately reopened by compressed air when the contacts are again clear of the water. As snorkels were designed to draw in and vent gases, a submarine's diesel exhaust could be seen on the surface up to a distance of about 4.5 km (2.8 mi). [8]
The Kingston valves linking the ballast tanks to the sea could be left open, a practice known as "riding the valves", and the water level in the tanks controlled solely by the vent and blowing air valves. The drawback was that the ballast tanks, open to sea pressure, had a flat surface to the crew compartment and were thus restricted in ...
During construction, steel plates are welded over the ballast tanks flood ports to prevent water from getting into the tanks and putting the submarine in an unsafe condition. The construction crew put a fire hose down the tank's vent pipe and forced it past the check valve. [2]
Vent (submarine), a valve on a submarine's ballast tanks; Automatic bleeding valve, a plumbing valve used to automatically release trapped air from a heating system; Drain-waste-vent system or plumbing drainage venting, pipes leading from fixtures to the outdoors; Duct (flow), used to deliver and remove air
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Subsea valves are used to isolate or control the flow of material through an undersea pipeline (submarine pipeline) or other apparatus.Most commonly used to transport oil and gas, they are designed to function in a sub-marine environment, withstanding the effects of raised external pressure, salt-water corrosion, and bubbles or debris in the material carried.