Needle valves are used to control flow into delicate gauges
A Needle Valve has a long tapered point at the end of the valve stem. The long taper of the valve element permits a much smaller seating surface area than that of the Globe Valve; therefore, the needle valve is more suitable as a throttle valve. Needle valves are used to control flow into delicate gauges, which might be damaged by sudden surges of fluid under pressure. Needle valves are also used to controlthe end of a work cycle, where it is desirable formotion to be brought slowly to a halt, and at otherpoints where precise adjustments of flow arenecessary and where a small rate of flow is desired.Although many of the needle valves used influid power systems are the manually operatedtype , modifications of this type of valveare often used as variable restrictors. This valve isconstructed without a handwheel and is adjustedto provide a specific rate of flow. This rate of flowwill provide a desired time of operation for aparticular subsystem. Since this type of valve can be adjusted to conform to the requirements of aparticular system, it can be used in a variety ofsystems. A needle valve was modified as a variable restrictor.
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