Which statement about gate valves is true?

Which statement about gate valves is true?

• A. Gate valve is a linear-type valve
• B. Gate valve is a rotary-type valve
• C. Gate valve is used only for check flow
• D. Gate valve cannot isolate sections

Answer: (A)

Gate valves operate with the closure member moving straight in and out along the pipe axis. That straight-line, sliding motion is what defines them as linear-type valves. When opened, the gate lifts or slides away to leave a wide, unobstructed path for flow; when closed, the gate seals against seats to give a tight shut-off. This makes them ideal for isolating sections of a water distribution system, since they provide reliable shut-off with minimal flow resistance when fully open, and strong isolation when closed. They aren’t rotary-type devices like ball or butterfly valves, which use rotation of a closure member, and they’re not limited to checking flow—they’re commonly used specifically to isolate portions of the system.

Gate valves operate with the closure member moving straight in and out along the pipe axis. That straight-line, sliding motion is what defines them as linear-type valves. When opened, the gate lifts or slides away to leave a wide, unobstructed path for flow; when closed, the gate seals against seats to give a tight shut-off. This makes them ideal for isolating sections of a water distribution system, since they provide reliable shut-off with minimal flow resistance when fully open, and strong isolation when closed. They aren’t rotary-type devices like ball or butterfly valves, which use rotation of a closure member, and they’re not limited to checking flow—they’re commonly used specifically to isolate portions of the system.