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2. Human factors in diving equipment design - Wikipedia

   en.wikipedia.org/wiki/Human_factors_in_diving...

   The exhaust valve should offer the minimum resistance to exhalation, including a minimum opening pressure difference, and low resistance to flow through the opening. It should not easily block or leak due to foreign matter such as vomit. Exhaust gas flow should not be too distracting or annoying to the diver in a normal diving posture.

3. Surface-supplied diving equipment - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving...

   The spring force is adjustable by the diver to prevent the suit from deflating completely or over-inflating and the diver being floated uncontrollably to the surface. Some helmets have an extra manual valve known as a spit-cock, which can be used to vent excess air when the diver is in a position where the main exhaust can not function correctly.

4. Diving helmet - Wikipedia

   en.wikipedia.org/wiki/Diving_helmet

   In a free-flow or constant flow helmet, gas is delivered at an approximately constant rate, set by the panel operator, independent of the diver's breathing, and flows out through an exhaust valve against a slight adjustable over-pressure. Free-flow helmets use much larger quantities of gas than demand helmets, which can cause logistical ...

5. Suomy - Wikipedia

   en.wikipedia.org/wiki/Suomy

   Suomy (pronounced su-oh-mee) is an Italian brand of motorcycle helmets.. Since its foundation in 1997, [1] the activity of the Italian company has been strictly oriented towards the racing world, which offers valuable insights and information for the development and creation of helmets.

6. Schuberth - Wikipedia

   en.wikipedia.org/wiki/Schuberth

   Schuberth – Logo. Schuberth GmbH is a German producer of safety helmets, combat helmets, protective headgear for Formula One, motorcyclists and industrial workers. [1]The company is based in Magdeburg, in Saxony-Anhalt and was founded in 1922 in Braunschweig, in Lower Saxony, and has been producing safety helmets for 90 years. [2]

7. Pressure regulator - Wikipedia

   en.wikipedia.org/wiki/Pressure_regulator

   Reclaim diving helmets [ edit ] The depth at which most heliox breathing mixtures are used in surface-supplied diving is generally at least 5 bar above surface atmospheric pressure, and the exhaust gas from the diver must pass through a reclaim valve , which is a back-pressure valve activated by the increase in pressure in the diver's helmet ...