Electromagnetic flowmeter lining material how to choose

For different pipe lining, different processing technology, here a brief introduction of the process points of different lining, draw reference flow meter manufacturers. According to the specification requirements of the measurement and is used to measure the medium of the lining to roughly the following: a, neoprene: neoprene is suitable for more than 12 large caliber sensors, used for measuring water, sewage, weak acid, weak alkali medium fluid. General with adhesive film directly attached on the inner wall of the stainless steel tube, through vulcanization. This process, the rubber lining of the surface roughness is generally high, operation should pay special attention to the flat seams, but lower relative roughness. For small diameter neoprene and EPDM rubber lining, use the mould pressing * good, attached on the inner wall of the tube and then curing, reduce the lining surface roughness and surface roughness depends on the mould core rod pressure and vulcanization process. Polyvinyl chloride resin: at present, the domestic polyurethane lining use is more soft material and adopt measures for the process of water lining roughness depends not only on the mold surface roughness of rods, also will be affected by water, exhaust gas, heating, cooling and material composition, the influence of the proportion. Rigid polyurethane used more abroad amino ethyl formate polyester rubber, its forming is the important technological points, remove injection involved in the process of bubbles, make chemical reaction ( Hardening, crosslinking) The stability; Using centrifugal casting process method: guarantee the raw material in storage in a dry state, smooth and uniform on raw materials mixing, stirring, for removing the involved in the bubble of raw material, pipe set appropriate rotational speed, well control the temperature of the raw material processing, hardening, crosslinking. Request lower roughness of lining material fluorine plastic should be used. Piping, tanks and other containers used for the PTFE fluoride plastic lining, usually in metal pipe lining into a thin walled teflon tube, or using the teflon tube inserted, and then for bonding process. This kind of lining is the main drawback of resistance to negative pressure is not high, affected by temperature, bonding is often unreliable. Three, fluorine plastic: for electromagnetic flowmeter, the fine fluorine plastic lining is PFA. PFA mainly adopts the way is injected into molten resin, and then injection ( Injection molding method) 。 By injection molding method, belong to no one. The quality of the PFA lining has good chemical resistance, heat resistance, high adhesion, Surface finish) 。 Especially in the area of chemical resistance, heat resistance, using the unique manufacturing technology, can reduce internal stress and the intrinsic bubbles, in order to avoid cracks, such making that flow meter used in harsh environments, still has the very high reliability. Therefore, in the process of PFA lining manufacture, management is important for injection molding temperature ( Resin viscosity, metal mold temperature) , metal mold cooling control ( Cooling time, temperature) Pressure control, resin. Injection temperature setting should be as low as possible, to reduce the thermal degradation of PFA resin. Injection molding, metal mold temperature to keep melting point is greater than the resin evenly. Due to the need for high precision control of cooling, reason should be set up multiple cooling loop in the metal mold, and carry on independent cooling control operation. In cooling control at the same time, also deal with resin pressure control.

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