A buoyancy control device has an input mechanism for a second ascent rate. The second rate of ascent may be selected by using the first input means 81, which may be a rate selection switch. You can also select the second rate by selecting the first rate. Depending on what circumstances exist, the buoyancy control device might include a number different features. The buoyancy controller device in one embodiment comprises a buoyancy tanks and a 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. Divers may also have additional control over their buoyancy with weight belts, integrated BC weights, and other weight belts. 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 attach to a string and control air levels. Most BCDs have one or two dump valves on each shoulder. The dump valves are used to deflate the bladder during diving to maintain 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). Many BCDs can be worn over a swimsuit so that the weight stays in place. Some models include front weight pockets and rear trim pockets that allow for easy access to your weights. The jacket-style BCD features a cushioned back, which makes it comfortable to wear and allows you adjust its buoyancy gauges easily.
Attachment systems for BC
A BC vest is a type that scuba divers use to keep buoyant and prevent from sinking. A BC is used to secure the diver's SCUBA tank. BCDs have similar functions, but they may vary in their design. 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 use a force balance principle to control fluid flow. A pneumatic device has three ports. There is an air supply, a control signals output, and an exit. Above the device to be controlled, a lever arm is placed. It features a flexible diaphragm to change pressure when external sensors move it. The supply air valve opens when the sensor pressure rises. The controlled device will move when there is more pressure.