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Because of the unique characteristics and performance of the magnetic flap level gauge, the industry consensus that it is a reliable safety instrumentation, the main reason is that the magnetic flap level gauge with magnetic coupling isolation confined structure . Especially suitable for flammable, explosive and corrosive liquid level detection. So that the original complex level of liquid level detection tools become simple and safe. The instrument is suitable for the liquid level detection of various pressure (or open) liquid storage facilities (towers, tanks, tanks, spherical vessels and boilers) in the industrial production process and can display the working status of various liquids in situ Level height. Coupled with the liquid level transmitter will be able to transmit long-distance liquid level position signal through a certain electrical devices to achieve the purpose of automatic control and measurement of liquid level, according to different measurement environments and requirements, the installation of magnetic flap level timing can By supporting the installation of appropriate parts, can greatly enhance the magnetic flap level gauge in the measurement of adaptability. Flange valve is an important component of the magnetic flap gauge, in the long-term use, the flange valve will have a variety of faults, but also the need for regular maintenance and cleaning. This article is a brief introduction when the user encountered in the magnetic flap level gauge flange valve failure reasons and a variety of solutions. First, the sealing surface leakage: 1, magnetic flap level gauge flange sealing surface with dirt. Solution: Clean the sealing surface. 2, sealing surface damage. Solution: Abrade the sealing surface or replace the sealing surface. Second, the valve stem is not flexible: 1, spool cover angle too tight or bearing wear. Solution: adjust the packing tightness or replace the bearing. 2, stem or stem nut between the debris or dust, stem or stem nut damage. Solution: Disassemble the cleaning valve stem and replace the valve stem or stem nut if damaged. 3, opening and closing device failure. Solution: According to the device manual check out the fault repair. Third, the middle of the magnetic flap level gauge flange parts leak: 1, the flange bolts are not tightened or uneven fastening. Solution: loosen the screw, and then re-symmetrical uniform tighten. 2, gasket damage or failure. Solution: Change the gasket. 3, flange sealing surface dirt. Solution: Remove the cleaning flange. Fourth, stuffing box leakage: 1, packing loose or packing gland pressure side. Solution: packing gland should be uniform compression. 2, magnetic flap level gauge flange packing failure. Solution: Replace with new packing.