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Valves are devices that are used to control, direct, and regulate the flow and pressure of gases, liquids, and fluidized solids. Globe valves, gate valves, butterfly valves, ball valves, and safety relief valves among others are used in various process industries such as oil and gas, chemical, power, refining, and food and beverage. These valves can be operated electrically, pneumatically, and hydraulically. 更多
