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A needle valve precisely controls the flow rate of clean gases or liquids. You can obtain smooth flow control by adjusting the stem and plunger adjustments. Ball valves and gate valves are best for on/off applications with negligible pressure/flow drop, but needle valves are best for finer flow control.
The typical characteristics of these valves include modest flow rates and a sizable pressure drop between the inlet and the output. The standard port diameters of needle valves range from 1/8″ to 2″.
A needle valve is commonly used to regulate the flow of gases, in conjunction with a flowmeter for accurate measurement.
The application determines the needle valve’s manufacturing material. Since brass and stainless steel show a variety of chemical resistance, they are the most popular materials for valve housing. But other materials are also available for unique purposes.
Limitations of needle valves include: