![]() These refer to the position the valve should take in the event of a failure, to understand what happens in the event of a failure we must first define types of failures. When referring to failure in valve control systems we often hear the terms Fail Open, Fail Close and Fail in last position. ![]() With its simplistic design, they require minimal maintenance and are used in applications where there are temperature extremes. ![]() Pneumatic valve actuators use air pressure, or another gas, as its power source. It can also be a safety issue if the valve needs to be closed faster than can be done by hand. Larger valves can be impossible to operate manually due to high thrust requirements and other valves can be located in remote or hazardous environments. Although they aren’t as expensive as the other options and can be easy to operate, it isn’t always possible or ideal to use this method. When a valve uses manual energy, it is operated by hand using hand-wheels, levers and gears.
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