Valves isolate (shut-off), switch, and control the flow of fluids in a piping system. These valves can be operated manually with levers, wrenches, and gear operators or remotely with electric, pneumatic, electro-pneumatic, and electro-hydraulic powered actuators.
Manually operated valves (hand valves) are typically used where operation is infrequent and/or a power source is not available.
Powered actuators allow valves to be operated automatically by a control system and locally or remotely with push button stations. Valve automation brings significant operation advantages in the areas of process quality, efficiency, safety, and productivity.
Valves must be properly selected to operate safely, efficiently, and reliably without excessive maintenance. Further address accuracy, repeatability, and feedback requirements for automated control valves.