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What are the corrosion grades of needle valves? How does it work?

by:Lianke Valve     2022-07-23
Although the needle valve has a needle in its name, it does not look like a needle. The needle valve is very convenient to install and disassemble, and the connection is tight. It can be used for fire prevention, explosion-proof, high pressure resistance, and good sealing performance. It is an advanced connection valve in power station, oil refining, chemical plant and instrument measurement pipeline. Needle valve 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. 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. The 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 valve cover) 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 function of the production valve is to block the fluid, and it can be divided into many categories according to the different valve cores. The needle valve is called a needle valve because its valve core is a pointed cone, which is like a needle sticking into the valve seat when it is inserted into the valve seat. The business needle valve is a cone, so it can withstand pressure more than other valves and has good sealing performance, so it is generally used for liquid medium sealing or high pressure gas sealing.
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