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In the hot galvanizing production, many defects, for example, galvanization-missing, poor surface smoothness, a lot of zinc ash and slag and high zinc consumption, occur. In order to eliminate these defects, in general great attention is paid to molten zinc, but various working steps of the workpiece before its ente-ring pot are neglected. For this reason, we think that for increasing galvanizing quality, the pretreatment of the workpiece before pot is very important. Poor pickling as well as too high impurity content of galvanizing solvent cause the abovementioned defects. Applying galvanizing solvent is anindispensable step for tradi-tional dry hot galvanizing process. In the normal production process some impurities, such as acid, iron, dust, etc. are carried inescapably by pickled workpiece into galvanizing solvent. For long term production the impurity content in the solvent becomes more and more high, and thus these impurities is carried by the workpieces into the zinc pot and the impurity content of molten zinc in the pot becomes more and more. In this case poor galvanizing quality and a lot of zinc ash and slag cause increase of galvanizing cost. To counter this situation, our com- pany organized the engineering and technical personnel in many disciplines to tackle this keyproblem. Thanks to a long term investigation and many experiments, we have developed Xinyue Brand XY-Ⅲ type special solvent filter with multiple functions. It is one of precision box-type filtering devices. Manycustomers maintain that it is a filter for solvent with novel structure and excellent performance. It is noteworthy that be- sides its cleaning and filtering functions, acid-and-iron removing and heating functions are added to the d- evice(selection for customer) and it has more practical value. The device fills in the gaps in solvent filter wi- th acid-and-iron removing and heating functions. All the parts and positions of the device, which contact solvent, are made of high plastics or stainless steel and have excellent corrosion resistance. With compact structure, small weight, aesthetic appearance, easy to move,and many filtering cores and accuracies for selection, the filtering device can satisfy all the requirements under various technological conditions in the hot galvanizing, electroplating, chemical plating, phosphatizing, chemical industry and environment prote-ction trades, and so it is a vastly applicable product and is warmly welcomed by customers.