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What Valves Do and How They Function

Basically, valves control, direct, or regulate the flow and pressure of gases, liquids, or powders. Valves can open and close entirely or partially.


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In most instances, valves depend on a ball, diaphragm, or plate to help them control, direct, or regulate the flow of substances. Valves are used in appliances, chemical and water treatment plants, and commercial and residential buildings. According to the narrator, valves can be classified mainly in two ways; function and motion. This review will look at these two valve classifications and how they operate.

Under valves classified according to function, there are on and off shut valves (allow liquid flow by fully opening or closing), check valves (liquids in these valves flow in one direction only), and control valves, also known as pressure regulation valves (help control the flow of substances).

Under valves classified according to motion, there are linear motion valves (use multiple parts to control flow including diaphragms, gates, or globes), rotary motion valves (use multiple parts to control flow including ball, butterfly, and plug).

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