A buoyancy control device may include an input for a second rate. The second rate can be selected using the first input 81. This might be a rate select switch. Or, the second rate can be chosen by bypassing first-selected rate. Depending upon the circumstances, a buoyancy device may include many different features. The buoyancy control device may include a buoyancy pump and a weight belt.
Weight belts
The centre buoyancy of divers is out of their control. However, they can adjust the suit's weight and the position of their cylinder. In addition, weight belts and integrated BC weights can provide divers with additional control over their buoyancy. To provide neutral trim, these buoyancy control devices should always be worn above the hips and below the knees.
Dump valves
You can use a BCD to regulate your buoyancy in two different ways. You can either deflate the air bladder completely or you can add air to freshen the bladder. Dump valves attach to a string and control air levels. Most BCDs have one or two dump valves 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 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 an underwater vest that is worn by divers to prevent them sinking. The BC holds the diver and SCUBA tank in place. BCDs may look similar, but their functions and design can vary from one model to the next. It is crucial to learn how to properly use your BC and to have a backup plan in the event of a malfunction.
Pneumatic valves control the depth change
Pneumatic pumps are central to 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 features a flexible diaphragm to change pressure when external sensors move it. The left end of the lever arm lifts when the sensor's pressure is high and opens the supply valve. The controlled device will move when there is more pressure.