Which valve type has a spherical internal mechanism with a moving disk and stationary ring?

Which valve type has a spherical internal mechanism with a moving disk and stationary ring?

• A. Gate
• B. Globe
• C. Ball
• D. Needle

Answer: (B)

The concept here is a valve that throttles flow using a movable disk against stationary seating rings. In a globe valve, the body has a globe-like shape, and the closure element is a disk (plug) that moves up and down to seal against stationary rings that form the seats. This arrangement provides precise flow control and predictable seating, which is why the globe valve fits the description. Ball valves use a spherical ball as the closure element that rotates to align or block ports, not a moving disk against stationary rings. Needle valves use a slender needle that moves into a conical seat, rather than a disk against rings. Gate valves use a gate that slides into place to block flow, not a disk against stationary seats.

The concept here is a valve that throttles flow using a movable disk against stationary seating rings. In a globe valve, the body has a globe-like shape, and the closure element is a disk (plug) that moves up and down to seal against stationary rings that form the seats. This arrangement provides precise flow control and predictable seating, which is why the globe valve fits the description.

Ball valves use a spherical ball as the closure element that rotates to align or block ports, not a moving disk against stationary rings. Needle valves use a slender needle that moves into a conical seat, rather than a disk against rings. Gate valves use a gate that slides into place to block flow, not a disk against stationary seats.