Briefly analyze the basic knowledge of fluoroplastic lined butterfly valve

Brief analysis of the basic knowledge of fluoroplastic lined butterfly valve With the rapid development of modern petrochemical industry, some media used in special working conditions are extremely corrosive, even stainless steel valves and valves lined with rubber and enamel can no longer satisfy need. If Hastelloy, Monel or No. 20 alloy is used as valve material, because it contains a large amount of rare metals such as ni, cr, ti, mo, nb and pt, its resources are limited and the price is expensive. According to the achievements of modern science and technology, there are fluorocarbon bonds in the molecular structure of fluoroplastics and their shielding effect, which have excellent corrosion resistance, high (low) temperature resistance, non-adhesion and electrical insulation, and can resist almost all chemical media. (including hydrofluoric acid, concentrated sulfuric acid and aqua regia) corrosion. Using the plastic processing principle of fluoroplastics, the fluoroplastics are lined in the ordinary steel shell to isolate the direct contact between the steel metal and the strong corrosive medium, which not only solves the problems of low strength and inability to withstand high pressure of fluoroplastics, but also solves the Steel materials are not corrosion-resistant. Fluoroplastic lined valve has excellent heat resistance and cold resistance, excellent electrical insulation and excellent chemical stability, can resist the corrosion of various strong acids, strong alkalis and strong oxidants, low friction and self-lubrication are very good , can be used for a long time in the range of - 195 ~ 200 ℃. Scope of application Fluoroplastic lined butterfly valve nominal pressure is pn116 (the maximum pressure of fluoroplastic can reach 215mpa). dn50～1200. The applicable temperature of the valve is comprehensively evaluated according to the temperature that the different materials (metal materials and non-metal materials) can withstand. Such as steel lined with fluorine plastic (wcb + f46) material, the operating temperature is - 29 ~ 150 ℃. Limit the maximum value not to exceed 150 ℃. The applicable medium is corrosive medium such as low viscosity acid and alkali, mainly refers to strong corrosive medium such as acid, alkali, organic and inorganic solvents. Low viscosity is relatively high concentration of granular media, fluoroplastic lined valves should try to avoid the use of solid particles. Test method (1) Temperature test The temperature measurement involves the temperature range from room temperature to liquid nitrogen, using a thermocouple thermometer to measure, The electrical temperature signal is measured, collected and input into the measurement and control computer by a digital multimeter, displayed on the computer interface, and recorded and saved automatically by the computer. At the same time, the computer transmits the temperature measurement value to the temperature display instrument on the instrument panel for on-site display. (2) Pressure test pressure measurement range is 0 ~ 10mpa. Pointer type precision pressure gauge and digital pressure gauge are used to display the system pressure on the instrument panel. At the same time, the system pressure is measured by a pressure transmitter and converted into a voltage signal, which is measured, collected and input into the measurement and control computer by a digital multimeter. , displayed on the computer interface, and recorded and saved automatically by the computer. (3) Liquid level In order to ensure that the liquid nitrogen level meets the requirements of the valve test, a differential pressure pressure transmitter is used to measure the liquid level. The measured electrical signal is measured, collected and input to the computer by a digital multimeter for display, and reminds to add liquid nitrogen and stop the liquid nitrogen filling operation. (4) Flow According to the different sealing forms of the valve, the allowable leakage of the valve is different. Valves with soft sealing structure should have zero leakage. For hard-sealed valves, a certain amount of leakage is allowed. Based on the above situation, there are two devices for measuring flow. One is a flowmeter with small flow, which is used to measure the leakage of hard-sealed valves or soft-sealed valves that allow a certain amount of leakage under relatively abnormal working conditions. For small leaks, since the general flowmeter has been unable to detect, it is necessary to measure by observing and counting the number of air bubbles leaking in the water at the open end. Use a computer data acquisition system to record the number of electrical pulses to achieve automatic counting.
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