An input means is included in a buoyancy control device that allows for a second rate ascent. You may select the second rate by using the input means 81. This may also be known as a rate selection button. Or, the second rate can be chosen by bypassing first-selected rate. Depending on what circumstances exist, the buoyancy control device might include a number different features. One embodiment includes a buoyancy device and a weight belt.
Weight belts
While the centre of buoyancy of a diver is largely out of the diver's control, the weight of the suit and the position of the cylinder are within the diver's power to adjust. Divers may also have additional control over their buoyancy with weight belts, integrated BC weights, and other weight belts. These buoyancy control devices should be worn at the waist, above the hips, and below the knees, to provide a neutral trim.
Dump valves
Two ways can a BCD control your buoyancy. You can either deflate the air bladder completely or you can add air to freshen the bladder. Dump valves are typically attached to a string and allow you to control the air levels. BCDs generally have one or two dumps valves at 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
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 has a cushioned hard back that makes wearing it comfortable and allows you to easily adjust 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 designed to keep the diver and SCUBA tanks in place. BCDs come in a variety of styles and functions. It is important that you know how to use your BC correctly, and have a backup plan in place for any malfunctions.
Pneumatic valves can be used to control depth changes
Pneumatic valves form the heart of many industrial processes. They use a force balance principle to control fluid flow. Three ports make up a pneumatic valve: an air supply port, a control signal output and an exhaust. A lever arm is positioned above the device that needs to be controlled. It is equipped with a flexible diaphragm that changes pressure when an external sensor varies its position. 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 will move when there is more pressure.