Choosing the correct type of valve is critical in all applications. While it is possible to interchange different options in pneumatic valves, finding the ideal match for a specific use improves control, extends the life of the valve, and also improves the overall functioning of the system.
A pneumatic needle valve is used to control the flow of air through a system, component or through a piece of equipment. Similar to a ball, globe or gate valve it can be used to allow the air to flow fully through the valve, to regulate the flow of air or to stop the flow of air at the valve.
The Design
The design of the pneumatic needle valve is very different from other valves. It has a long, sharply tapered end at the bottom of the valve step. This needle-like tip is most often called a plunger. Turning the handle on the top of the valve lowers or raises the plunger, which fits into a similarly shaped seat. Fulling tightening or tuning the handle shuts off all air flow, which positioning the plunger up or down allows for precise air flow through the valve.
These valves can be manually operated or automatically controlled through a system. Both use the same method, but there is the advantage of precision control with the automated systems.
Uses of the Needle Valve
In general, a pneumatic needle valve is an ideal option when there is a need for precision control of the air flow through the valve. This is important when sudden changes in air flow are undesirable. In most applications, these are valves used in relatively low-pressure applications and with lower flow rates.
However, specially designed needle valves can be used for higher pressures and higher flow rates. The choice of materials makes them suitable for demanding applications such as high-temperature applications or if corrosion is a concern in wet environments.
