Working principle of needle valve
Working principle of needle valve
Needle valve is a type of flow control valve whose working principle is based on the contact or separation between the pointed tip (i.e. needle) on the valve core and the valve seat to control the flow of fluid. Needle valves are commonly used for precise regulation and control of the flow rate of liquids or gases. The diameter of needle valves is relatively small, generally not exceeding DN20, and only a small number of needle valves have a diameter of DN50.The main Needle Valve product names of China Needle Valve Network include:ANSI J11W/H Internal And External Thread Needle Valve,ANSI J11W/H Internal Thread Needle Valve,ANSI JG-1F/JG-2F Multi-entrance Metering Valve,CJ123 Multi-functional Pressure Gage Needle Valve，EN5-4 SS-M2F8 Internal Thread Three-valve Manifold,EN5-1 SS-M2F8 Internal Thread Two-valve Manifold,EN5-2 EF-2 Two-valve Manifold
The structure of a needle valve is relatively simple, mainly composed of a valve body, a valve seat, and a valve core. The pointed end on the valve core is sealed and matched with the orifice of the valve seat. By rotating the valve core, the orifice can be opened or closed to achieve the purpose of controlling flow or pressure. When the valve core is rotated to separate the tip from the valve seat, fluid can flow through the orifice, thereby increasing flow rate or pressure. On the contrary, when the valve core rotates and the tip comes into contact with the valve seat, the fluid channel is closed, and the flow rate is reduced or completely cut off.
By controlling the degree of rotation of the valve core, precise control of fluid flow can be achieved. Needle valves have the advantages of fast response speed, wide flow regulation range, and good linear regulation performance, and are therefore widely used in many application fields. Needle valves have a wide range of applications, generally suitable for pressure gauge connections in pipelines or containers, medium sampling, or complex directional changes in experimental flow channels.
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