Introduction of a top mounted magnetic flap level gauge

　　The magnetic flap level gauge is a typical liquid level measuring instrument. There are many forms, and according to the different installation methods, it is mainly divided into two forms: side-mounted and top-mounted. Among them, the top-mounted magnetic flap level gauge is also more common. It is suitable for underground storage tanks, or containers that are not suitable for side openings or have limited side installation space. Generally, the standard top-mounted magnetic flap level gauge includes a float tube, a process connection flange, a casing, a float and a liquid level indicating component. It is suitable for measuring liquids with general weak corrosiveness. However, due to the diversity of the measured medium, a top-mounted magnetic flap that can measure highly corrosive media is required to adapt to it. To this end, this article introduces a top-mounted magnetic flap level gauge-a structure of a top-mounted magnetic flap level gauge with an inner lining and anti-corrosion.

　　For some containers containing highly corrosive liquids, a lined anti-corrosion magnetic flap level gauge should be used. Generally, the lined anti-corrosion magnetic flap level gauge is different from the standard magnetic flap level gauge in that a layer of corrosion-resistant polytetrafluoroethylene fluoroplastic pipe is lined inside the measuring main float tube to isolate the corrosive medium to be measured from the steel pipe. During the measurement process, the lining layer is always in contact with the medium, which can achieve a better anti-corrosion effect. At present, when many manufacturers produce lined anti-corrosion top-mounted magnetic flap level gauges, they only rely on stretching and flanging the PTFE tube to obtain the process connection flange sealing surface lining, and then use a thin PTFE gasket to press the flange during installation. Since the width of the stretched PTFE tube flange cannot match the size of the top-mounted process connection large flange sealing surface, it is difficult to achieve complete sealing and there is a risk of leakage. Obviously, this production process has some defects and cannot ensure that the process connection flange lining does not leak.

　　By carefully analyzing the characteristics of the lining fluorine material, selecting suitable fluorine materials, and innovating and improving the structure of the magnetic flap level gauge, we have produced a high-quality lined top-mounted magnetic flap level gauge, which overcomes the deficiency of previous products that the flange sealing surface could not be fully lined due to the large specifications of the connecting flange, improves the corrosion resistance, meets the needs of industrial production to measure the level of highly corrosive liquids, obtains good results, and has applied for and obtained a national utility model patent with the patent number: 201721282291.3.

　　This utility model patent discloses the structure of a top-mounted magnetic flap level gauge with inner lining and anti-corrosion. As shown in Figure 1, it is a cross-sectional view of the process connection flange connection part of the top-mounted magnetic flap level gauge. In Figure 1, serial number 200 refers to the large-size flange of the process connection of the inner lining type top-mounted magnetic flap level gauge. The anti-corrosion lining of the sealing surface of the flange is the key and difficulty of the top-mounted anti-corrosion magnetic flap level gauge. Previously, the lining of the flange was realized by stretching the flange of the polytetrafluoroethylene tube. Since the stretching flange cannot be made larger, this process cannot meet the anti-corrosion requirements of the flange lining. Through the efforts of the engineers of Jiwei Automation, some innovative designs were carried out, and a new anti-corrosion fluoroplastic, polytetrafluoroethylene propylene, was selected, and a molding process was adopted. First, the fluoroplastic needs to be sintered at high temperature for a long time, and then it is molded to form an anti-corrosion layer on the upper and lower surfaces of the flange. The sintered and molded anti-corrosion layer not only meets the requirements of the flange sealing surface, but also has stronger lining adhesion. The effect is shown in Figure 2; 410 and 430 in Figure 2 are the lining anti-corrosion layers on the upper and lower surfaces of the flange. The upper lining anti-corrosion layer 410 is in contact with the polytetrafluoroethylene flange on the buoy port flange of the upper main body part and locked to seal. The lower lining anti-corrosion layer is matched and connected to the mounting flange of the container tank, thereby forming a complete and continuous lining anti-corrosion layer, which improves the overall anti-corrosion performance of the instrument.

　　This utility model patent technology has been successfully applied in Jiwei's magnetic flap level gauge products, further improving and perfecting the product performance of Jiwei's magnetic flap level gauge, extending the product's service life, ensuring stable production operation, and has been unanimously praised by users.