Scuba Regulators and Dive Gauges

The main purpose of a scuba regulator is to take high pressure air from your scuba tank and adjust it to the pressure that you need for breathing.

When you inhale (on demand) it supplies you with air and then directs your expired breath into the surrounding water as you exhale.

A regulator will also direct air to your BCD (buoyancy control device), diving instruments and dry suit if you’re using one.

Regulators usually consist of a First stage (which attaches to the scuba tank valve and reduces the cylinder air pressure to an intermediate pressure), a Second stage with a mouthpiece which the diver breathes through, an alternate second stage (a spare second stage for you or your buddy to use in a diving emergency situation), a Low pressure hose which supplies air to your BCD (and dry suit if you’re using one) so you can inflate it to increase your buoyancy, and finally a High pressure hose which sends air to your SPG (submersible pressure gauge) so you always know how much air you have left in your tank.

How Scuba Regulators Work

Picture showing the parts of a Scuba RegulatorA scuba regulator - also known as a demand valve - reduces the cylinder's high-pressure air to an ambient pressure that allows the diver to breathe the flow upon demand (inhalation).

Scuba Regulators have few moving parts, which makes them simple and reliable. The two stages of air pressure reduction take place primarily in the first stage and then further in the second stage at the mouthpiece.

A one-way exhaust valve directs the exhaled air back into the water through small vents – known as open circuit.

Scuba repair technicians should keep your regulators maintained and serviced regularly.

A divers' submersible pressure gauge or 'contents gauge' is a precision instrument that tracks how much air is remaining in the scuba tank during the dive. Most divers will also have a depth gauge as part of the console so that he can monitor his depth and direction.

Gauge consoles tend to require delicate handling due to their analogue and digital design and should not be dropped or banged or allowed to dangle while diving to avoid damaging your gauges promoting passive interaction with fragile aquatic life.

Scuba Regulator Tip - Consider buying inexpensive hose protectors and attachment clips to protect your regulator and other scuba gear that dangles near to the sand and coral reefs.

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