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. Or, the second rate can be chosen by bypassing first-selected rate. Depending upon the circumstances, a buoyancy device may include many different features. One embodiment includes a buoyancy device 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. Weight belts and integrated BC weighs are also options that divers can use to control their buoyancy. These buoyancy control devices are best worn below the knees, at the waist and above the hips.
Dump valves
The BCD offers two options to regulate your buoyancy. 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. When diving, you can use the dump valves to deflate the air bladder to maintain a comfortable buoyancy.
Jacket-style buoyancy control device
Whether you're a new diver or have been diving for years, you may want to invest in a jacket-style buoyancy control 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 is equipped with a cushioned, hard back. It makes wearing it comfortable and allows for easy adjustment of its buoyancy gauges.
Attachment systems BC
A BC is a type of dive vest worn by scuba divers to maintain a level of buoyancy and prevent the diver from sinking. A BC is used to secure the diver's SCUBA tank. BCDs come in a variety of styles and functions. It is important to know how to use your BC properly and make a backup plan in case of malfunction.
Pneumatic valves control the depth change
Pneumatic pumps are central to most industrial processes. They control the flow of fluids by means of a force-balance principle. Three ports make up a pneumatic valve: an air supply port, a control signal output and an exhaust. 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 left end of the lever arm lifts when the sensor's pressure is high and opens the supply valve. The controlled device is activated when there's more pressure.