Compared with other valves, the needle valve has better pressure resistance and good sealing performance. It is very suitable for medium with small flow or high pressure devices. It can also be used for sealing liquid medium. of. Next, I will introduce to you what a needle valve is and the very important needle valve selection principles. Needle valve: It is an important part of the instrument measurement pipeline system, mainly including globe valve
and ball valve, its function is to open or cut off the pipeline passage. Needle valve has the advantages of convenient installation and disassembly, tight connection, good for fire prevention, explosion-proof and high pressure resistance, and good sealing performance. . The needle valve has good sealing performance and long service life. Even if the sealing surface is damaged, it can continue to use only by replacing the vulnerable parts. When installing the needle valve, the flow direction of the medium should be consistent with the direction of the arrow on the valve body. Manual globe valve and ball valve can be installed in any position of pipeline. Needle valve is a kind of valve that can be accurately adjusted and has a wide range of uses, such as the cutting distance for flame cutting, the knob for adjusting the flame temperature is the needle valve, and the instrument needle valve is an important part of the instrument measurement pipeline system. Globe valves and ball valves are used to open or cut off pipeline passages. The function of any valve of the element analyzer is to cut off the fluid. According to the different valve cores, it can be divided into globe valve, gate valve, plug valve, ball valve, butterfly valve
, needle valve and so on. The valve core of the needle valve is a very sharp cone, which is inserted into the valve seat like a needle, hence the name. The needle valve shape can withstand greater pressure than other types of valves, and the sealing performance is good, so generally It is used for the sealing of gas or liquid medium with small flow and high pressure. It is most suitable to use the needle valve shape with the pressure gauge. The general needle valve shape is made of threaded connection. Selection principle of needle valve 1. In the pipeline system and device of low temperature medium, it is advisable to choose low temperature needle valve with valve cover. 2. On the pipeline system of the catalytic cracking unit of the oil refining unit, the lifting rod needle valve can be selected. 3. In the device and pipeline system of corrosive media such as acid and alkali in the chemical system, it is advisable to use an all-stainless steel needle valve made of austenitic stainless steel and PTFE as the valve seat sealing ring. 4. Metal-to-metal sealing needle valve can be used in the pipeline system or device of high temperature medium in metallurgical system, power system, petrochemical plant and urban heating system. 5. When flow adjustment is required, a worm gear driven, pneumatic or electric regulating needle valve with V-shaped opening can be selected. 6. For oil and natural gas transmission main lines, those that need to be cleaned and buried in the ground, choose a needle valve with a full-bore and full-welded structure; for those buried in the ground, choose a full-bore welded connection or flange connection ball valve. 7. For the pipelines and storage equipment of refined oil, use flanged needle valves. 8. On the pipelines of city gas and natural gas, use a needle valve with flange connection and internal thread connection. 9. In the oxygen pipeline system in the metallurgical system, the needle valve that has undergone strict degreasing treatment and flanged connection should be selected. After reading it, do you know what a needle valve is? The selection principle of needle valve should be firmly remembered. Different needle valves need to be used in different places, and not one needle valve can be used everywhere. The various types are also for us to be more convenient to use and improve the service life of the device, making them more suitable for the actual situation.
In an age when valve application is increasingly important, the researchers believe manufacturers should pay close attention to their results.
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When you choose to buy instead of types of industrial valves, the money you save may allow you to buy multiple other necessities, more than you had initially planned on buying.