Valves are a type of apparatus that is used to manage the flow of different kinds of matter. Whether that is the flow of liquid, gas, air or slurries, an on/off valve is able to stop and start the flow. A synonym for valves is the term regulars. Valves can be found in mechanical devices of all types. As a result of the enormous usages for valves, there are a ton of different designs. The required function determines which valve is best for the job. Valves also come in a variety of sizes. They can be smaller than your toe and larger than your garage. They also can vary in their simplicity and complexity. The use of valves dates back to B.C. They