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 [..]

The pressure expressed in bar, Pascal or PSI, as measured above a perfect vacuum.

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 [..]

Noise produced by a gas accelerating to supersonic velocity at critical or higher pressure drops through the valve trim.

Valve that is used to control air flow. This flow is generally small. (Learn More)

A globe style valve where the inlet and outlet ports are at 90°.

American Society for Testing and Materials

The pressure exerted by the atmosphere.

The pressure exerted on the downstream side of a valve.

A valve design which uses a spherical ball as the closing element. Closure is achieved by turning the ball.(Learn More)