A needle valve features a tapered plunger and a screw like seat for holding the plunger. The seat helps to rotate the plunger that can then be used as a valve. A high degree of precision control can be obtained depending upon how the rotations are coupled with the degree of valve-turn. A high degree of precision can be obtained by tuning the rotations so that they result in less degree of turn.

      The high degree of control over the flow that a needle valve provides makes its ideal to be used as a valve in cases where flow needs to be regulated to a higher precision. Brass and stainless steel needle valves are often used in billing meters since they are less prone to temperature variations and weather elements. The meters include natural gas, water, and power meters. Power and chemical plants also use needle valves to control the flow of fluids to other subsystems. These valves help to control the flow as well as act as safety devices that can be used to completely shut down the flow if required.

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