Needle Valve Needle valves are precision devices used to control fluid flow. They consist of a tapered needle-like plunger that fits into a seat within the valve body, The plunger is connected to a handle, allowing manual adjustment. Turning the handle moves the plunger up or down through a threaded mechanism, altering the orifice size and fluid flow. Needle valves are commonly used for flow regulation, pressure control, and instrumentation. Their tapered design enables fine adjustments, making