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Lower seal – Most deep-water helmets have a means of excluding water from the helmet regardless of the posture of the diver. Shallow water helmets rely on the diver keeping the helmet approximately upright, and the flow of breathing air keeps the water level lower than the diver's nose and mouth, and excess air escapes at the bottom of the ...
Three models of shallow water helmet by Miller-Dunn. Shallow water helmets are not standard diving dress, but were used by divers for shallow work where a dry suit was not required. Generally a shallow water helmet was a single item, which was lowered over the diver's head and rested on the shoulders, with an open bottom, so no exhaust valve ...
Drass-Galeazzi – Italian manufacturer of lightweight diving helmets – Italian diving equipment manufacturer. Lightweight diving helmets. [28] [46] Dunlop Rubber – British multinational company manufacturing natural rubber goods – Manufacturer of swimfins during WWII. The Dutch Diving Helmet – Shallow water diving helmets. [47]
Morse introduced the second generation commercial Helmet in the mid-1930s. The front door size was increased and the bonnet shell was larger. The Mark V exhaust valve replaced the rear head butt exhaust valve. Morse also introduced the #15 Shallow Water Diving Helmet and #15 air pump.
This type of helmet is popular where divers have to work hard in relatively shallow water for long periods. It is also useful when diving in contaminated environments, where the helmet is sealed onto a dry suit, and the entire system is kept at a slight positive pressure by adjusting the back-pressure of the exhaust valve, to ensure that there ...
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