A gate valve usually requires more turns
A Gate Valve usually requires more turns - more work - to open it fully. Also, unlike many globe valves, the volume of flow through the valve is not in direct relation to number of turns of handwheel.
Since most Gate Valves used have wedge disc with matching tapered seats, refacing or repairing of the seating surfaces is not a simple operation.
Gate valves, while not designed for throttling or too frequent
operation are generally ideal for services requiring full flow or no
flow.
Gate Valves are not designed for throttling
In a slightly opened position high-velocity flow will cause wire drawing and erosion of seating surfaces in gate valves.
Repeated movement of disc near point of closure under high-pressure flow may gall or score seating surfaces on downstream side.
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