fluorine lining gate valve

The working principle and corrosion level of needle valve you must know

by:Lianke Valve     2022-08-10
We all know that the needle valve has strong pressure resistance and good sealing performance, so it is often used in instrumentation measurement pipeline systems, and it is responsible for the use of open or cut off pipeline passages. Because of its good sealing performance, it is also used in pipelines of gaseous media. He is not the same as the ball valve. What is the difference, you should see for yourself. 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. valve. The needle valve has good sealing performance and long service life. Even if the sealing surface is damaged, it only needs to replace the vulnerable parts, and it can be used continuously. 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. A needle valve is a valve that can be precisely adjusted. It 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 pressure gauge needle valve is an important part of the instrument measurement pipeline system, mainly including globe valves and ball valves. Cut off pipeline access. The function of any valve is to cut off the fluid. Depending on the valve core, it can be divided into globe valve, gate valve, plug valve, ball valve, butterfly valve, needle valve, etc. The valve core of the internal thread needle valve is a very sharp circle, cone Insert the valve seat like a needle, hence the name. The needle valve shape can withstand greater pressure than other types of valves and has better sealing performance, so it is generally used for smaller flow rates. It is most suitable to use the needle valve shape with a pressure gauge. threaded connection. Corrosion of needle valve is usually understood as the damage of needle valve metal material under the action of chemical or electrochemical environment. Since the phenomenon of 'corrosion' occurs in the spontaneous interaction between metal and the surrounding environment, how to isolate the metal from the surrounding environment or use more non-metallic composite materials is the focus of anti-corrosion. The valve body (including the bonnet) of the needle valve occupies most of the weight of the valve and is in constant contact with the medium, so the selection of the valve often starts from the valve body material. There are only two forms of corrosion of the needle valve body, namely chemical corrosion and electrochemical corrosion. Its corrosion rate depends on the temperature, pressure, chemical properties of the medium and the corrosion resistance of the valve body material. The corrosion rate can be divided into six grades: 1. Complete corrosion resistance: the corrosion rate is lower than 0.001 mm/year; 2. Extreme corrosion resistance: the corrosion rate is 0.001 to 0.01 mm/year; 3. Corrosion resistance: the corrosion rate is 0.01 to 0.1 mm/year 4. High corrosion resistance: corrosion rate of 0.1 to 1.0 mm/year; 5. Poor corrosion resistance: corrosion rate of 1.0 to 10 mm/year; 6. No corrosion resistance: corrosion rate greater than 10 mm/year. The corrosion level can be divided into six grades. Now you know the difference between needle valve and ball valve. Although the sealing performance of the two is very good, they are still different~ Today's introduction to the needle valve ends here. If you want to know more, you can pay more attention to our company~
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