NAUI Master Scuba Diver 14 Diving Equipment other than air (e.g. enriched air nitrox) are also available. Regulator Attachments The regulators used today are called “single hose” because one hose connects the first and second stages. However, they can have many hoses attached to the first stage, in both high and low pressure ports. The following are regulator attachments: • Submersible pressure gauge (high pressure). • BC inflator hose (low pressure). • Extra second stage (octopus) (low pressure). • Dry suit inflator hose (low pressure). A number of regulators have several low pressure ports in the first stage. If your regulator will not accommodate all of the items you would like to attach to it, multiple port adapters are available at dive stores. Regulator Care and Maintenance Your regulator must be rinsed after each use, and the purge button must not be depressed when there is water in the second stage, unless it is pressurized with air. Your regulator must also be professionally serviced annually. The first stage dust cover must be in place any time the regulator is not in use. In addition, there are Airholes Flexible Main Valve Flexible Inhalation Diaphragm and Purge other aspects of care that you should know at the Master Scuba Diver level. It is better to soak your regulator in warm water and then rinse it, rather than just rinse it. Be sure the first stage dust cover is well secured and sealed during both. Do not lubricate your regulator. Especially avoid the use of silicon spray which can ruin regulator parts and can allow the second stage diaphragm to become unseated. An extra second stage attached to a regulator should also be functionally tested semi-annually and serviced annually. Regulators used frequently in swimming pools require more frequent service than normal because the chlorine used to purify the pool dispels the lubricant used on internal seals. Coloration of the filter on the first stage of your regulator may provide clues about the condition of the scuba cylinder you are using. A greenish filter indicates corrosion from moisture inside a cylinder or dripped onto the filter, a reddish filter indicates rust from a steel cylinder, and a blackish filter indicates carbon dust in your cylinder from a compressor filter. None of these conditions is good for your regulator. Any such indi- Air Flow Air from 1st Stage Airholes Small Hole Downstream Pilot Valve Exhaust Diaphragm 2nd Stage Body Air Chamber (Pressure Equals Line Pressure) Some Air into Chamber More Air out than in from Small Main Valve Hole Mouthpiece Mouthpiece Pilot or Servo-Assisted Demand Valve (Open) Pilot or Servo-Assisted Demand Valve (Closed) FIGURE 1-11. PILOT VALVE REGULATOR
20047TC
To see the actual publication please follow the link above