Fluoroplastic lined butterfly valve design tips

Fluoroplastic lined butterfly valve design tips

1. Fluoroplastic Lined Butterfly Valve Overview: With the rapid development of the modern petrochemical industry, some of the media used in special operating conditions are extremely corrosive. Even stainless steel valves and rubber linings can not meet the demand for enamelled valves . If the use of Hastelloy, Monel or No. 20 alloy valve information, because it contains a large amount of Ni, Cr, Ti, Mo, Nb and Pt and other rare metals, its limited resources, expensive. According to the results of modern science and technology, fluorine plastic molecular structure with fluorocarbon bond and its shielding effect, with excellent corrosion resistance, high (low) temperature, non-sticking and electrical insulation, almost all chemical media (Including hydrofluoric acid, concentrated sulfuric acid and aqua regia) corrosion. Fluoroplastics plastic processing principle, the fluorine plastic lined in the ordinary steel shell to cut off the steel and metal contact with strong corrosive media, both dealing with the fluoroplastic low strength and can not accept the problem of high pressure, but also deal with Iron and steel materials are not resistant to corrosion problems. Fluoroplastic-lined valves have excellent heat and cold resistance, excellent electrical insulation and excellent chemical stability, and are resistant to corrosion, low friction and self-lubricity of various strong acids, bases and strong oxidizers , Long-term use in the range of -195 ~ 200 ℃. 2. Fluoroplastic lined butterfly valve structure and design 2.1 Construction and the main part of the title shown in Figure 1 and Figure 2. 1 Drive installation 2 Dust seal 3O-ring 4 Disc 5 Butterfly lining 6 Seat lining 7 Body Figure 1 Double flanged butterfly valve 2.2 Fluoroplastic lined butterfly valve Scope Fluoroplastic lined butterfly valve Nominal pressure PN116 (Fluoroplastics pressure up to 215MPa). DN50 ~ 1200. Valve temperature for the selected according to the different materials used (metal materials and non-metallic materials) to be able to accept the temperature comprehensive assessment. Such as steel lined fluorine plastic (WCB + F46) data, the use of temperature -29 ~ 150 ℃. Limit the maximum value does not exceed 150 ℃. Suitable medium for low viscosity acids and bases and other corrosive media, mainly refers to acidic, alkaline, organic and inorganic solvents and other corrosive media. Low viscosity is relatively high concentration of granular media, the fluorine plastic lining valve should try to prevent the use of solid particulate media. 3. Fluorine plastic lined butterfly valve test methods (1) temperature experimental temperature measurement reach the range of room temperature to liquid nitrogen temperature, the use of thermocouple thermometer measurement, the temperature signal through the digital multimeter measurement, acquisition and input measurement and control computer, the computer interface appears , And recorded by the computer automatically and custody. At the same time, the computer will be sent to the temperature measurement instrument temperature indicator on the instrument panel to stop the scene. (2) pressure test pressure measurement range of 0 ~ 10MPa. The use of pointer precision pressure gauge and digital pressure gauge on the instrument panel on the scene to stop the pressure on the system at the same time, the use of pressure transmitter measurement system pressure and converted to voltage signals, measured by the digital multimeter, acquisition and input control The computer appears on the computer interface and is automatically recorded and stored by the computer. (3) Level In order to ensure the liquid nitrogen level to meet the valve test requirements, using differential pressure transmitter to measure the liquid level. Measure the electrical signal through the digital multimeter measurement, collection and input to the computer to stop showing, and prompted to add liquid nitrogen and stop the liquid nitrogen filling operation. (4) the flow rate According to the different valve sealing method, the valve allows leakage is different. Valve structure of the soft seal, the leakage should be zero. On the hard seal of the valve itself is allowed to have a certain amount of leakage. Based on the above situation, equipped with two kinds of flow measurement installation, one is a small flow meter, used to measure a certain amount of leakage allows the seal valve or soft seal valve in the relative abnormal working conditions when the leak situation. On the tiny leakage, due to the normal flowmeter was unable to detect, need to go through and open the way to count the number of bubbles in the water way to stop measuring. Application of computer data acquisition system records the number of electrical pulses to complete automatic counting. Fluoroplastic liner butterfly valve Based on the computer data acquisition system of low-temperature valve performance test installation, the thermocouple, pressure sensor, liquid level sensor and flowmeter of each signal, the pre-treatment input to the computer, through the data Acquisition software to stop the data display, storage and printing, but also based on the relevant parameters set to control the self-pressurization of liquid nitrogen tank cryogenic experimental tank to stop filling liquid nitrogen. The test system uses centralized data monitoring, not only completed the instructions issued by the computer to stop the automatic operation, improve work efficiency, timeliness, accuracy and peace of mind, but also facilitate the unified data custody and management.

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