A buoyancy control device has an input mechanism for a second ascent rate. You can select the second rate of ascent by using the first input device 81. This could be a rate selection switch. Alternatively, the second rate of ascent may be selected by bypassing the first selected 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 buoyancy of divers is out of their control. However, they can adjust the suit's weight and the position of their cylinder. Additionally, divers may have the option to use weight belts or integrate BC weights to increase their 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
Two ways can a BCD control your buoyancy. Either you can completely deflate your air bladder or add air to refresh it. Dump valves are generally attached to a string and help to control air levels. BCDs usually have one to two dump valves per shoulder. You can deflate your air bladder by using the dump valves while diving. This will maintain a comfortable buoyancy.
Jacket-style buoyancy control device
You can invest in a jacket-style BCD, whether you're new to diving or have been diving since years. BCDs are made to fit snugly over swimsuits, so they will not move around. Some models come with front weight pockets and rear trim pockets for easy access to your weights. A jacket-style BCD comes with a cushioned soft back. This makes it more comfortable to wear and lets you easily adjust its buoyancy.
Attachment systems in 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 can be similar in design, but the functions and functionality of each model will differ. It is vital to understand how your BC works and what to do in the case of an error.
Changing depth is controlled by pneumatic valves
Pneumatic valves form the heart of many industrial processes. They use a force balance principle to control fluid flow. A pneumatic valve is equipped with three ports: an exhaust, control signal output, or air supply. A lever arm is placed above the device that must be controlled. The flexible diaphragm on the arm changes the pressure depending on how an external sensor positions it. 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.