Needle Valve

• General Info

  A needle valve is specifically designed for precise control of fluid flow, especially in low-flow, high-pressure scenarios. Its name is derived from the needle-like, tapered stem that moves in and out of a narrow seat, enabling accurate regulation of flow. This design is particularly advantageous in applications requiring fine adjustments, such as instrumentation, calibration, and small pipelines.
  
  Key Components
  Body: Typically made from materials like stainless steel, brass, or other corrosion-resistant alloys.
  Needle (Stem): A long, narrow, tapered stem that fits into a small orifice, allowing for fine control of fluid flow.
  Seat: A small opening in the valve body where the needle stem moves to manage flow.
  Handwheel or knob: Allows for manual adjustment of the needle stem's position for precise control.
  
  Working Principle
  By turning the needle stem, it moves vertically into or out of the seat, either allowing or restricting fluid flow. The tapered end of the needle facilitates a gradual opening and closing, making it ideal for systems that require precise flow adjustments. Needle valves are generally operated manually, providing delicate control over flow rates.

• Sizes:

  Needle valves, which are used to control flow in a precise manner, are available in various sizes. The most common sizes are:
  
  1/8-inch (3.18 mm)
  1/4-inch (6.35 mm)
  3/8-inch (9.53 mm)
  1/2-inch (12.7 mm)
  3/4-inch (19.05 mm)
  1-inch (25.4 mm)
  1.5-inch (38.1 mm)
  2-inch (50.8 mm)