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Needle valves symbol
Needle valves symbol with function is flow control. The purpose of this type of valve is to regulate flow through a system whether it be simple regulation or fine metering. Although the primary design function is to control flow, some valves also provide on-off control.
Valve Function Flow Control
Needle Valves 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 Stainless Steel needle valve 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.
Screwed Bonnet Needle Valves Bar Stock, ~6000 psig, NB Series
Integral Bonnet Needle Valves General Purpose, ~5000 psig, NG & NGH Series
Forged Body Needle Valves, ~10000 psig, NF and NFH Series
Union Bonnet Needle Valves , ~10000 psig, NU & NUH Series
Nonrotating-stem Needle Valves, ~5000 psig, ND & NDH Series
Rising Plug Valves, ~6000 psig, NR & NRG Series
Outside Screw and Yoke (OS&Y) Needle Valves, ~6000 psig, NY Series
Toggle Valves, ~300 psig, NT Series
Medium and High Pressure Needle Valve
Needle Valve Flow Pattern
