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globalspec.com
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Definitions (129)
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reverse flow
Flow of fluid in the opposite direction from that normally considered the standard direction. Some rotary valve are considered to be bi-directional although working pressure drop capabilities may be l [..]
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absolute pressure
The pressure expressed in bar, Pascal or PSI, as measured above a perfect vacuum.
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actuator
A device connected to the valve that allows remote movement of the valve. It can be an air, fluid or electrically powered device. Actuators may be used when valves are remotely located (e.g., on pipel [..]
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aerodynamic noise
Noise produced by a gas accelerating to supersonic velocity at critical or higher pressure drops through the valve trim.
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air-to-close
An increase in air pressure to the actuator is required to cause the valve to close. This is another way of saying the valve is fail open or normally open.
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air-to-open
An increase in air pressure to the actuator is required to cause the valve to open. This is another way of saying the valve is fail closed or normally closed.
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air valve
Valve that is used to control air flow. This flow is generally small. (Learn More)
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angle valve
A globe style valve where the inlet and outlet ports are at 90°.
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ansi class
A strength designation for valves which show the maximum pressures at various temperatures at which a valve can be expected to work safely. (Learn More)
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astm
American Society for Testing and Materials
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