What element allows a pipe to be either fully open or fully closed?

What element allows a pipe to be either fully open or fully closed?

• A. Gate valve
• B. Globe valve
• C. Check valve
• D. Ball valve

Answer: (A)

The ability to go from fully open to fully closed is provided by the sliding gate mechanism in a gate valve. The gate, which moves straight up and down between two seats, clears the flow path when raised for a nearly unobstructed bore, and sits down to seal off the passage when closed. This simple linear motion makes it ideal for on/off service with minimal resistance when open. Globe valves throttle flow because the disk moves toward a fixed seat, creating more resistance; check valves aren’t manual on/off devices and respond to flow direction; ball valves use a rotating ball to align or block the bore, but the specific element that enables a clean full-open/full-closed position in this context is the gate.

The ability to go from fully open to fully closed is provided by the sliding gate mechanism in a gate valve. The gate, which moves straight up and down between two seats, clears the flow path when raised for a nearly unobstructed bore, and sits down to seal off the passage when closed. This simple linear motion makes it ideal for on/off service with minimal resistance when open. Globe valves throttle flow because the disk moves toward a fixed seat, creating more resistance; check valves aren’t manual on/off devices and respond to flow direction; ball valves use a rotating ball to align or block the bore, but the specific element that enables a clean full-open/full-closed position in this context is the gate.