A buoyancy control device has an input mechanism for a second ascent rate. The first input mechanism 81 may be used to select the second rate. It may also serve as a rate 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. In one embodiment, the buoyancy control device comprises a buoyancy tank and a weight belt.
Weight belts
Although the centre of buoyancy is out of the divers control, the suit weight and position of the cylinder can be adjusted by them. Additionally, divers may have the option to use weight belts or integrate BC weights to increase their control over their buoyancy. To maintain a neutral trim, the buoyancy control device should be worn at your waist, above your hips and below you knees.
Dump valves
You can use a BCD to regulate your buoyancy in two different ways. Either blow out the air bladder completely, or add air. Dump valves are typically attached to a string and allow you to control the air levels. BCDs usually have one to two dump valves per shoulder. To maintain buoyancy, the dump valves can be used to inflate your air bladder while diving.
Jacket-style buoyancy control device
A jacket-style buoyancy control device (BCD) is a good investment, regardless of whether you are a novice diver or an expert diver. Many BCDs can be worn over a swimsuit so that the weight stays in place. Some models are equipped with rear trim pockets and front weight pockets. A jacket-style BCD comes with a cushioned soft back. This makes it more comfortable to wear and lets you easily adjust its buoyancy.
BC attachment systems
A BC is a type scuba dive vest used by divers to maintain buoyancy and prevent 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 vital to understand how your BC works and what to do in the case of an error.
Pneumatic valves allow for the control of depth.
Pneumatic pumps are central to most industrial processes. They control fluid flow by using the force-balance principle. A pneumatic valve can have three ports: air supply, control signal output, exhaust. The device to be controlled is located above a lever arm. It is equipped with an adjustable diaphragm which changes pressure when the position of an external sensor changes. The sensor's pressure increases and the left end lifts the lever arm to open the supply air valve. The controlled device becomes more mobile when the pressure increases.