The buoyancy control device (BCD) is the device that provides a scuba diver control with their buoyancy allowing them to float or sink in the water during the scuba diving. Generally, the BCD enables the diver to inflate or deflate the apparatus of air, permitting the diver to go down or go up while in the water. There are 2 widely used BCD designs which are the jacket style and vest style. The majority of scuba destinations and establishments rent out jacket style BCDs in recent times. The video below shows how to use Scuba BCD (jacket type BCD).
The BCD has a few functions and features:
A back-plate and also bands to keep the scuba divers air tank
Bands to keep the gauges and octopuses,
More recent BCDs have built-in weight devices – enabling divers to put their weights inside their BCD, rather than a weight bel .
A low-pressure primary feed that delivers gas from scuba diving cylinder and also diving regulator to the BCD.
A vent control device that permits gas to get out of the bladders of the BCD.
An inflation valve that enables gas from the direct feed towards the bladders of the BCD.
An over pressurization device that instantly vents the bladders in case the diver over inflates the BC by rising or by inserting an excessive amount of gas.
A leash that the diver puts on with straps around the upper body and over the shoulder muscles
D-rings or even other fasten areas, for clipping on additional tools like flashlights, reels, strobes, video cameras and stage cylinders