Needle valve is an important part of the instrument's measuring pipeline system. It mainly includes globe valve and ball valve. Its function is to open or cut the pipeline. The needle valve has the advantages of easy installation and disassembly, connection and fastening, favorable to fire prevention, explosion-proof and high pressure resistance, good sealing performance, etc. It is a kind of advanced connection valve in the measurement pipeline of power station, oil refinery, chemical device and instrumentation. . The needle valve has good sealing performance and long service life. Even if the sealing surface is damaged, it only needs to replace the wearing parts and can continue to use. When installing the needle valve, the flow direction of the medium should be the same as the direction of the arrow on the valve body. Manual shutoff valves and ball valves can be installed anywhere in the pipeline. The needle valve is a kind of valve that can be precisely adjusted and has a wide range of uses. For example, the cutting distance for flame cutting is a needle valve that adjusts the flame temperature. The meter needle valve is an important part of the instrument measuring piping system. Shut-off valve and ball valve, its function is to open or cut off the pipeline used. The role of any valve is to cut off the fluid. According to different valve cores, they can be divided into globe valves, gate valves, plug valves, ball valves, butterfly valves, needle valves, and so on. The spool of the needle valve is a very sharp cone that is inserted into the valve seat like a needle, hence its name. The needle valve shape can withstand greater pressure than other types of valves and has good sealing performance. Therefore, it is generally used for the sealing of small flow, high pressure gas or liquid media. The needle valve shape is best suited for use with pressure gauges. The general needle valve shape is made into a threaded connection.