A buoyancy control device includes an input means for a second rate of ascent. You can select the second rate of ascent by using the first input device 81. This could be a rate selection switch. Alternativly, you can select the second rate of ascent by bypassing the first rate. Depending on the circumstances, a buoyancy control device may be comprised of a number of different features. The buoyancy control device may include a buoyancy pump and a weight belt.
Weight belts
The centre of buoyancy for a diver is not within his control. However the suit's weight, and the position in the cylinder, are within his reach. In addition, weight belts and integrated BC weights can provide divers with additional control over their buoyancy. These buoyancy control devices should be worn at the waist, above the hips, and below the knees, to provide a neutral trim.
Dump valves
Two ways can a BCD control your buoyancy. You have two options to control your buoyancy: either you can deflate the entire bladder or you can add some air to the bladder. The dump valves, which are usually attached to a string, help control the air level. A majority of BCDs have at least one dump valve on each shoulder. To maintain comfortable buoyancy while diving, the dump valves allow you to inflate the air bladder.
Jacket-style buoyancy control device
You may be a beginner or an experienced diver and want to get a jacket-style buoyancy controller device (BCD). BCDs that fit comfortably over your swimsuit will ensure the weight remains in place. Some models come with front weight pockets and rear trim pockets for easy access to your weights. The jacket-style BCD features a cushioned back, which makes it comfortable to wear and allows you adjust its buoyancy gauges easily.
Attachment systems BC
A BC is an underwater vest that is worn by divers to prevent them sinking. The BC holds the diver, SCUBA tank and other equipment securely in place. BCDs have similar functions, but they may vary in their design. It is crucial to learn how to properly use your BC and to have a backup plan in the event of a malfunction.
Changing depth is controlled by pneumatic valves
Pneumatics valves are essential for most industrial processes. They control fluid flow by using the force-balance principle. A pneumatic valve is equipped with three ports: an exhaust, control signal output, or air supply. The control device is controlled by a lever arm. It is equipped with a flexible diaphragm that changes pressure when an external sensor varies its position. When the sensor's pressure rises, the left end of the lever arm lifts and opens the supply air valve. The controlled device becomes more mobile when the pressure increases.