. Earth, sky, and sea . Fig. 25. Reciprocating valve the piping and the double valve F (represented diagrammatically in Fig. 8) to avoid, if possible, and anyway to lessen the consequences of, a leak in the upper part of any of our compartments. Let us imagine a small accidental opening in the top of the float in compartment No. 9, for example. If the float were simply open at the bottom towards L, the petrol pushed by the pressure of the water would gush out in floods and, what is worse, the petrol in the central compartment. No. 7, might follow it as a result of siphoning action. A glance at
. Earth, sky, and sea . Fig. 25. Reciprocating valve the piping and the double valve F (represented diagrammatically in Fig. 8) to avoid, if possible, and anyway to lessen the consequences of, a leak in the upper part of any of our compartments. Let us imagine a small accidental opening in the top of the float in compartment No. 9, for example. If the float were simply open at the bottom towards L, the petrol pushed by the pressure of the water would gush out in floods and, what is worse, the petrol in the central compartment. No. 7, might follow it as a result of siphoning action. A glance at our sketch will make the role of the double valve clear. Normally, if there is no leak anywhere, the hull will breathe by this valve. When (at the moment of a dive or at the moment of a lowering of temperature) the water must enter the float, it will enter by L, will raise the lower flap-valve and will reach the base of the float. This flap-valve, however, is loaded in such a manner that it will only open if the pressure exceeds [ 176]
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