1. Fluorine plastic lined butterfly valve summary: with the rapid of modern petrochemical industry developed, and the use of some of the media in the special conditions with strong corrosion resistance, even if is the stainless steel valves and valve lining rubber, enamel, also cannot meet the demand. If the hartz alloy, monel alloy or 20 alloy as the valve material, because it contains a large number of Ni, Cr, Ti, Mo, Nb and rare metals such as Pt, its resources are limited, the price expensive. On the basis of modern science and technology achievements, fluorine plastic with fluorine carbon bonds in molecular structure and its shielding effect, has excellent corrosion resistance, resistance to high ( Low) Warm, not adhesion and electrical insulation, it can resist all chemical medium ( Including hydrofluoric acid, sulfuric acid and aqua regia) The corrosion. According to the principle of plasticity processing of fluorine plastic, fluorine plastic lined in ordinary steel casing body, to cut steel metal direct contact with the corrosive medium, already dealt with low fluorine plastic strength and can't accept the problem of high pressure, and processing the steel material is not the problem of corrosion. Fluorine plastic lined valves has excellent heat resistance and cold resistance, excellent electrical insulation and excellent chemical stability, resistant to strong acid, strong alkali and strong oxidizing corrosion, low frictional and the smoothness is very good, can be in - for a long time 195 ~ 200 ℃ within the scope of application. 2. Fluorine plastic lined butterfly valve structure and design 2. 1 the title structure and main parts as shown in figure 1 and figure 2. 1 driver installation 2 dustproof o-ring seal ring 3 4 5 butterfly butterfly plate plate lining layer 6 seat lining layer 7 body figure 1 double flanged butterfly Industrial Valves 2 cohesion. 2 fluorine plastic lined butterfly valve scope of fluorine plastic lined butterfly valve nominal pressure for PN116 ( Acceptance of fluorine plastic pressure can reach 215 mpa) 。 DN50 ~ 1200。 The different data (the valve in accordance with the applicable temperature choose Metal materials and nonmetal materials) Can accept the temperature of the comprehensive evaluation. Such as steel lining fluorine plastic ( WCB+F46) Materials, the use of temperature is 29～150℃。 Qualified high not exceed 150 ℃. Applicable medium to low viscosity acid and alkali corrosive medium, such as refers to acid, alkali, strong corrosive medium such as inorganic and organic solvent. Low viscosity is relatively higher levels of granular media, fluorine plastic lined valves should try to prevent using solid granules medium. 3. Fluorine plastic lined butterfly valve test method ( 1) Temperature experiment temperature measurement hit at room temperature to liquid nitrogen temperature zone, the thermocouple thermometer measurement, collection after DMMS measurement, temperature signal and input measurement and control computer, appeared on the computer interface, and recorded by the computer automatically complete and safekeeping. At the same time, the computer will be walked to the temperature measurement value instrument appearance manifest temperature meter to stop the scene. ( 2) Pressure experiment measurement range of 0 ~ 10 mpa. Using pointer precision pressure gauge and digital pressure gauge on the instrument appearance board appeared on the system pressure to stop the scene, at the same time, the pressure transducer measurement system, and converted into voltage signal, the digital multimeter measurement, collection and input measurement and control computer, appeared on the computer interface, and recorded by the computer automatically complete and safekeeping. ( 3) Liquid level to ensure that the liquid nitrogen level meet the request of the Industrial Valves test, using the differential pressure transducer measurement of liquid level height. Measurement signals after DMMS measurement, collection and input to the computer to stop, and prompt filling liquid nitrogen and suspending liquid nitrogen filling operations. ( 4) Flow according to the different methods of valve seal, Industrial Valves allows the leakage quantity is different. Soft seal structure of the valve, the leakage amount should be zero. And about hard seal valve, itself a leakage amount is allowed. Equipment based on the status of the installation of two kinds of measurement flow, one is the small flow meter, used to measure allows a certain amount of hard seal to leak valve or soft seal valve in relative to the status of the leakage when not working normally. About the small amount of leakage, with ordinary flowmeter was not detected, announces the end after check and count the number of leakage of air bubbles in the water way to stop the measurement. Application of computer data acquisition system records the number of electrical pulses, complete the automatic counting. 4. Fluorine plastic lined butterfly valve in the computer data acquisition system based on the cryogenic valve performance testing installation, can put the thermocouples, pressure sensors, liquid level sensor and meter of multiple signals, after input into the computer, the pre treated by data acquisition software stop data show, storing and printing, also can be set up according to related parameters to control the pressurization system of low temperature of liquid nitrogen tank experiment slot stop filling liquid nitrogen. The test system adopts the centralized data monitoring, already finished through computer issue instructions to stop automatic operation, advance the work efficiency, operation of timeliness, accuracy, and peace, and convenient for the unification of the data storage and management.
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