The working principle of the needle valve is to control the flow of the fluid based on the contact or separation between the tip on the valve core and the valve seat. When the valve core is rotated, the gap between the tip and the valve seat will change, thereby changing the channel size of the fluid and realizing precise regulation of the flow. By controlling the degree of rotation of the valve core, the flow of the fluid can be accurately controlled to meet different process requirements.
Structure and materials of needle valves
The needle valve is mainly composed of a valve body (valve box), a valve stem (valve shaft), a handle, etc. The valve body is designed in a slender needle shape, which can accurately adjust the gap with the valve seat to control the flow of the fluid. The valve is usually equipped with scale marks so that the operator can adjust the valve opening to a specific position as needed to achieve the required flow control.
Application scenarios of needle valves
Needle valves are widely used in various occasions requiring precise flow control, especially when dealing with corrosive media. They are commonly found in laboratories, scientific research, chemical industry, and semiconductor industry. In addition, needle valves are also used in piping systems and devices for cryogenic media, as well as piping systems for catalytic cracking units in oil refining units.
