The summary of fluorine plastic lined butterfly pneumatic valve 3

Overview



with the rapid development of modern petrochemical industry, with a strong corrosive medium, and pneumatic valves and stainless steel lined with rubber, ceramic pneumatic valve can't satisfy the need, in particular, some conditions of use. If hartz alloy, monel alloy or etc. , due to the use of pneumatic valve material, because it contains a nickel, chromium, titanium, molybdenum, niobium, platinum and other precious metals and a large number of resources are limited and expensive. , according to the achievements of modern science and technology in the molecular structure of the fluorine plastic fluorine carbon bonds and shielding effect and excellent corrosion resistance, high ( Low) Wen, not adhesion, electrical insulation, resistance to almost all of the chemicals ( Including hydrofluoric acid, sulfuric acid, corrosion and aqua regia) 。 Fluorine plastic plastic processing principle, fluorine plastic lined in general car body steel structure housing, with intense isolated by direct contact with metal corrosion of steel, not only solved the low fluorine plastic strength, can't bear high pressure, solve the problem of corrosion of the steel is not tolerated. Fluorine plastic lining pneumatic valve has excellent heat resistance and cold resistance, excellent electrical insulation and good chemical stability, resistance to acid, alkali, strong oxidizing corrosion, low friction, is a self lubrication, but - for a long time 吗? ℃ range.
and
structure and design. Scope of the
fluorine plastic lined butterfly pneumatic valve nominal pressure (PN Fluorine plastic pressure can achieve MPa) 。 DN? 。 Pneumatic valve selection is based on ( Metal materials and nonmetal materials) The temperature of the different material can withstand the temperature of the comprehensive evaluation. Such as fluorine plastic steel ( Water + fluoride) - material, the use of temperature 吗? ℃. Limit the maximum value does not exceed ℃. Medium is acid, alkali and other corrosive medium viscosity is low, mainly refers to the acid, alkali, strong corrosive medium such as inorganic and organic solvent. Relatively low concentration of granules medium to high viscosity, fluorine plastic lining pneumatic valves should avoid to use solid particles of the medium.
。 , test method for
( ） Temperature
test involves temperature measurement range from room temperature to liquid nitrogen temperature zone, measured with thermocouple, temperature signal by the digital multimeter to measure, collect and input the computer monitoring and control, by automatically recorded and stored in the computer display on the computer interface. At the same time, the computer will be transported to the scene of the instrument display on the dashboard temperature display of temperature measurement.
)
test pressure for pressure? Analog and digital meters Pennsylvania precision pressure gauge pressure gauge on the dashboard display system measuring range of pressure on the scene, and the pressure of pressure sensor measuring system, and converted into voltage signal, the digital multimeter to measure, monitor and control computer, collect and input, the computer screen of automatic recording and saving by computer.
( ） Level
to ensure that the liquid nitrogen level, in order to meet the pneumatic valve test, the use of differential pressure transmitter level measurement requirements. Measuring signal by the digital multimeter, collect and display the input to the computer, and remind stop filling liquid nitrogen and liquid nitrogen filling operation.
( ） Process
according to different pneumatic valve seal form, the pneumatic valve leakage is different. Soft seal structure of pneumatic valve, leakage should be zero. As for the sealing pneumatic valve itself is to allow a certain number of leakage. Based on the above situation, the flow measurement device has two, one is the small flow measurement instrument, allowed in a relatively normal pneumatic valve seal or soft seal pneumatic valve when a certain amount of leakage, leakage.
to leak, because normally not small flow quantity, need to open by observation and count in the measurement of bubble formation water leakage in the end of the month. Using a computer data acquisition system record electrical impulses, automatic counting number. Conclusion

the computer data acquisition system of low temperature pneumatic valve performance testing equipment, on the basis of thermocouple can be from different aspects, pressure sensor, liquid level sensor signals and flowmeter, pretreatment and input computer, through the data, according to data storage and acquisition software printing, also can be in accordance with the relevant parameter is set to control the liquid nitrogen filling liquid nitrogen tank from tank pressurization system at low temperature. The test system adopts the centralized data monitoring, has realized the computer automation issued instructions, improve efficiency, operation method, the accuracy and security, unified, easy to store and manage the timeliness of data.