With the rapid development of modern petrochemical industry, used in the special working condition of some of the medium with strong corrosion resistance, even if is the stainless steel valves and valve lining rubber, enamel, also cannot meet the need. If use hartz alloy, monel alloy or alloy as the valve material, such as 20 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. Based on the results of modern science and technology and molecular structure of fluorine plastic of fluorine carbon bonds and its shielding effect, it has excellent corrosion resistance, resistance to high ( Low) Warm, not adhesion and electrical insulation, can resist almost all chemical medium ( Including hydrofluoric acid, sulfuric acid and aqua regia) The corrosion. Use of fluorine plastic plasticity processing principle, fluorine plastic lined in ordinary steel casing body, to cut steel metal direct contact with the corrosive medium, not only solved the low fluorine plastic strength and can't bear high pressure problem, and solved the problem of the steel material is not resistant to corrosion. Fluorine plastic lined valves with excellent heat resistance and cold resistance, good electrical insulation and excellent chemical stability, resistant to strong acid, strong alkali and strong oxidizing corrosion, low frictional and self lubrication is very good, can be in - for a long time A range of 195 ~ 200 ℃. Scope of fluorine plastic lined butterfly valve nominal pressure for PN116 ( Fluorine plastic maximum under pressure of 215 mpa) 。 DN50 ~ 1 200。 The Industrial Valves in accordance with the applicable temperature choose different materials ( Metal materials and nonmetal materials) Able to withstand the temperature of the comprehensive evaluation. Such as steel lining fluorine plastic ( WCB + F46) Materials, the use of temperature for - 29～150℃。 Limit the highest do 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 avoid using solid granules medium test method ( 1) Temperature test temperature measurement in room temperature to liquid nitrogen temperature zone, the thermocouple thermometer, the temperature signals through the DMMS measurement, collection and input control computer, displayed on the computer interface, and completed by computer automatically record and save. At the same time, the computer will be the temperature on the temperature measured values to the instrument panel display to display on site. ( 2) Pressure test pressure measurement range of 0 ~ 10 m Pa. Using pointer precision pressure gauge and digital pressure gauge on the instrument panel on the system pressure, according to the on-site 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, displayed on the computer interface, and completed by computer automatically record and save. ( 3) Liquid level to ensure that the liquid nitrogen level to meet the requirements of the test valve, liquid level height measurement by the differential pressure transmitter. Electrical signals through the DMMS measurement, collection and input to the computer for display, and stop to remind filling liquid nitrogen and liquid nitrogen filling operations. ( 4) Flow according to the form of Industrial Valves sealing valve allows the leakage is different. Soft seal structure of the Industrial Valves, the leakage should be zero. For the hard seal valves, itself a leakage amount is allowed. Based on the above situation, equipped with two kinds of measuring flow of the device, one is the small flow meter, which is used to measure allows a certain hard seal valve leakage or soft seal valves in less leakage during normal working condition. For small leakage, with general flow meter is not detected, need through the observation and count the number of open end leakage air bubbles in the water form the measurement. Using a computer data acquisition system to record the number of electrical pulses, realize automatic counting.
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