A buoyancy control device may include an input for a second 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. A buoyancy control device can include a variety of features depending on the situation. One embodiment includes a buoyancy device 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. Weight belts and integrated BC weighs are also options that divers can use to control 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
The BCD offers two options to regulate 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 typically have one to two dump vales on each shoulder. To maintain comfortable buoyancy while diving, the dump valves allow you to inflate the air bladder.
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). Many BCDs are designed to fit comfortably over the swimsuit, so the weight will stay in place. Some models have front and rear weight pockets, while others have rear trim pockets. These pockets allow you to easily access your weights. A jacket-style BCD has a cushioned hard back that makes wearing it comfortable and allows you to easily adjust its buoyancy gauges.
Attachment systems in BC
A BC is an underwater vest that is worn by divers to prevent them sinking. A BC is used to secure the diver's SCUBA tank. BCDs can be similar in design, but the functions and functionality of each model will differ. It is important that you know how to use your BC correctly, and have a backup plan in place for any malfunctions.
Changing depth is controlled by pneumatic valves
Pneumatic pumps are central to most industrial processes. They control the flow of fluids by means of a force-balance principle. A pneumatic valve can have three ports: air supply, control signal output, exhaust. Above the device to be controlled, a lever arm is placed. It is equipped with an adjustable diaphragm which changes pressure when the position of an external sensor changes. The sensor's position changes and the pressure rises, the left arm of the lever lifts and opens its supply air valve. The controlled device moves when the pressure is higher.