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How do needle valves work?
The cross-sectional picture of a needle valve, format, and various features. A needle valve’s plunger has a pointed end that increases and decreases with the hold spin to extend or complete an orifice. The handle is connected to the plunger, called a stem. The plunger forces up or down through the lines when the handle turns. The locking nut contains the plunger from totally unscrewing. As the plunger forces down, the pointed end connects with the valve seat to fully seal the orifice. Often, the valve seat is also tapered. This allows for accurate flow rate control.
Various options and sizes are available to connect the needle valve to a pipe or hose through the port connection on the input and output—for the measure, threaded, flanged, or welded. The bonnet is attached to the valve housing, which can be made from other materials like brass or stainless steel.
Needle valve advantages and disadvantages:
Advantages:
- Accurate flow control, particularly for applications applying a low flow rate.
- Small size.
Disadvantages:
- High-pressure loss because of the increased limitation of fluid flow.
- The needle and seat may get damaged if the fluid has broken solids.
- Studying the needle valve handle does not show whether the valve is open or closed.
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