Elaborate on the fluorine plastic lined butterfly valve

With modern rapid development of petrochemical industry, in particular the use of some of the conditions is highly corrosive media, even stainless steel valves and lining rubber, ceramic valves also can not meet the need. The use of Hastelloy, Monel or Alloy 20, etc., as the valve material, because it contains a large number of Ni, Cr, Ti, Mo, Nb and Pt and other metals, its resources are limited, expensive. According to modern scientific and technological achievements, the molecular structure of fluorine in fluorocarbon plastic keys and the shielding effect, with excellent corrosion resistance and high (low) temperature, non-adhesion and electrical insulation, resistance to almost all chemicals (including hydrofluoric acid, sulfuric acid and aqua regia) of corrosion. The use of fluorine plastic plasticity processing principle, the fluorine plastic lined steel shell body in general, to cut off steel metal with strong direct contact with corrosive media, which addresses the fluorine plastic and can not withstand high-strength low-pressure problems, and solve the corrosion of steel materials intolerance problem. Fluoroplastic lined valves have excellent heat resistance and cold resistance, excellent electrical insulation and excellent chemical stability, resistance to various acids, alkalis and strong oxidizing corrosion, low friction and self-lubricating very , and can be long - 195 ~ 200 ℃ range.
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    Fluorine plastic lined butterfly valve nominal pressure PN116 (fluorine plastic, under pressure up to 215MPa). DN50 ~ 1 200. Valve for temperature by the use of different materials (metals and non-metallic material) can withstand the temperature of a comprehensive assessment. Such as steel fluorine plastic (WCB + F46) material, the use of temperature - 29 ~ 150 ℃. Limit does not exceed the maximum value of 150 ℃. Medium to low viscosity acid and alkali and other corrosive media, mainly referring to acidic, alkaline, organic and inorganic solvents and other strong corrosive media. Relatively low viscosity is a high concentration of granular media, the fluorine plastic lined valves should avoid using the medium of solid particlesTest Method(1) temperatureInvolved in the test temperature from room temperature to liquid nitrogen temperature measurement area, the use of thermocouple thermometer, temperature measurement signal through the digital multimeter, collect and input monitoring and control computer, the computer interface display by the computer automatically recorded and saved. At the same time, the computer will be transported to the temperature measured on the instrument panel temperature display meter on-site display.2) pressureTest pressure measurement range of 0 ~ 10M Pa. The use of precision pointer pressure gauge and digital gauge in the instrument panel shows the system pressure field, while the use of pressure transducer pressure measurement system, and converted to voltage signal by the DMM measurement, collection and computer input and control , displayed on a computer screen by the computer automatically recorded and saved.(3) levelIn order to ensure a high degree of liquid nitrogen to meet the requirements of the test valve, the use of differential pressure transmitters to measure level height. Measuring electrical signals measured by the DMM, collected and entered into the computer display, and to remind stop filling liquid nitrogen and liquid nitrogen filling operation.(4) flowAccording to the different forms of valve seal, valve allows leakage is different. Soft seal structure of the valve, the leakage rate should be zero. As for the seal of the valve itself is allowed to have a certain amount of leakage. Based on the above, the device is equipped with two measuring flow, one flow meter is a small, used to measure allows a certain amount of leakage seal valve or valves in the relatively soft seal under normal operating conditions when the leak .For the small amount of leakage, due to the general flow has been unable to detect, observe and be through the open end of counting the number of bubbles in the water leakage in the form of measurement. Using computer data acquisition system records the number of electrical pulses, to achieve automatic counting.

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             Peter    Huang