When using a needle valve, what is its primary function?

The primary function of a needle valve is to regulate flow rate precisely. Needle valves are designed with a slender, tapered point at the end of a controlling stem, allowing for fine adjustments to the flow of liquids or gases. This unique design enables operators to make very small changes in the opening, resulting in precise control over the flow rate, which is essential in applications where accurate flow management is crucial.

While needle valves can also block flow to some extent, their main purpose is not to serve as a complete shut-off valve. Instead, they are particularly useful in applications where gradual and minute adjustments are necessary, such as in calibration or sampling processes. The ability to finely tune flow rates makes needle valves an ideal choice for situations requiring careful monitoring and regulation.