Chapter 2- Diving Equipment Diving Equipment 25 with an easily adjustable harness with a quick-release buckle at the waist and at least one at the shoulder. Verify What You Have Learned Review the following questions about cylinders: 4. What is the difference between a “J” valve and a “K” valve? ______________________________ ______________________________ ______________________________ 5. The two types of metal used to make scuba cylinders are _________________ and ____________________. 6. In the United States, a visual inspection is performed _________________ and a hydrostatic test is performed ______________. REGULATORS The scuba regulator is a mechanical device that delivers air to you on demand (figure 2-17). One function of the regulator is to reduce the high pressure of the air in the cylinder to the ambient pressure, or the pressure surrounding your body, so you can breathe it. Regulators are composed of two main parts: the first stage and the second stage. Regulators also commonly have other pieces of equipment attached to them, including additional regulator second stages and gauges. First Stage The first stage of most United States type regulators fits over the post of the cylinder valve using a device combining the yoke and yoke screw (figure 2-18). Some use a DIN threaded fitting. In the first stage, the high-pressure air from the cylinder is reduced to approximately 10 bar (150 psi) above the pressure surrounding the cylinder. The air from the first stage is then delivered to the second stage through a low-pressure hose. The first stage of your regulator has a number of FIGURE 2-17. YOUR SCUBA REGULATOR DELIVERS AIR TO YOU ON DEMAND AND PROVIDES EASY BREATHING UNDER WATER. FIGURE 2-18. THE FIRST STAGE OF THE REGULATOR ATTACHES DIRECTLY TO THE SCUBA CYLINDER. outlets or ports to which hoses and pieces of equipment are attached. The first stage must have at least one high-pressure port. This port bypasses the mechanisms that reduce the pressure from the cylinder. Your submersible pressure gauge is attached to this port so you can monitor your air supply. The following hoses might
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