Needle Valves: The Basics And It’s Application


Needle valves are created to precisely control the flow. In this device, the long, tapered, needle-like point on one end of the valve stem is used as the disk in general valves. It perfectly fits into the seats. This type of arrangement allows for a very gradual increase/decrease in the size of the opening. Needle valves are often found useful as component parts of more (other) complex valves. For example, they are utilized in some types of reducing valves. High quality multiport needle valves are are used to reduce possible leak paths.


Needle valves are quite frequently used as metering valves. Metering valves are used for absolute fine flow control. The thin disk gives way for linear flow characteristics. This is the reason why the number of handwheel turns can be directly related to the flow amount. A usual metering valve has a stem with 40 threads on every single inch. 


Needle valves in most cases make use of one of the two styles of stem packing: a TFE packing cylinder or an O-ring with TFE backing rings. Needle valves are also sometimes equipped with replaceable seats for hassle-free maintenance. 


Applications:

  •  When accurate flow regulation is required.
  • Combustion automatic control system. 
  • Can also be used as on/off valves or for a throttling service.
  • Constant pressure pump governors are equipped with needle valves to minimize fluctuation effects.
  •  Has applications in scenarios where the flow needs to be gradually halted.

Consider the information mentioned above and purchase block and bleed needle valve or other needle valve from a reputed online store.

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