Needle Valves
Needle Valves
A needle valve, as shown in Figure 20, is used to make relatively fine adjustments in the amount of fluid flow.
The distinguishing characteristic of a needle valve is the long, tapered, needle-like point on the end of the valve stem. This “needle” acts as a disk. The longer part of the needle is smaller than the orifice in the valve seat and passes through the orifice before the needle seats. This arrangement permits a very gradual increase or decrease in the size of the opening. Needle valves are often used as component parts of other, more
complicated valves. For example, they are used in some types of reducing valves.
Needle Valve Applications
Most constant pressure pump governors have needle valves to minimize the effects of fluctuations in pump discharge pressure. Needle valves are also used in some components of automatic combustion control systems where very precise flow regulation is necessary.
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