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39 & 41 Review

Across
Casting with an enclosed port and threaded or flanged inlet and outlets.
Provides a fail safe position.
Verifies the valve actuator is in the correct position for the given controller signal.
Receives a signal and regulates the amount of material or energy in a process.
Two plugs and two seats.
Works off of a back pressure.
Dictates the amount of movement for a given air pressure applied to a diaphragm-and-spring actuator.
Packing enclosure that is threaded or bolted to the top of the valve body.
A path from inlet to outlet.
When the actual pressure ratio is less than the critical pressure ratio.
Provides the power and motion to the moving parts of a valve.
Down
One inlet and two outlets.
Starts or stops the flow of a process.
Increased air pressure moves the plug away from the seat.
Speed of sound in a gas.
Not used for throttling services.
Loading air pressure connection on top.
Current-to-Pneumatic (I/P)
Regulates the flow by changing the size of an opening.
Small implosions of vapor bubbles within a liquid.
Occurs when product drops below vapor pressure.
Transmits the force of the actuator to the plug.