For the company, how to select the filter plate suitable for its own production business is a very human problem. The following points should be considered:
First of all, practicality is the most important point for buyers, that is, the newly purchased filter plate matches the size of the matching filter plate of the original device. This is a necessary condition and conforms to the principle of practicality. The length, width and thickness of the filter plate shall be consistent with the original filter plate, so that the machine can run smoothly. If the secondary purchased filter plate is different from the original filter plate in length, width and thickness, it will cause the filter plate to be suspended on the beam, and the machine will not move left and right during filtration, and it will jam, or even the size is too small or too large to be used at all.
Second, the material must meet the needs of the buyer to be filtered. Before purchasing the filter plate, the material classification of the filter plate of the decompressor filter is required. At present, it is mainly divided into PP filter plate, PVDF filter plate, aluminum filter plate, natural rubber filter plate, stainless steel filter plate, cast iron filter plate, etc. When selecting materials, factors such as pH and temperature of filtrate shall be considered.
Third, according to the outlet and washing methods of the filter plate, the filter plate of the filter press can be divided into four types: open flow washable, open flow washable, concealed flow washable and concealed flow washable:
1. Open flow washable: in addition to the feed channel, this form also has a channel for washing solution. The filtering part is the same as that of the open flow. After filtration, carry out washing operation.
2. Open flow non washable: in this form, there is only one intermediate feed channel. The materials enter each filter chamber through the feed channel from the feed hole on the thrust plate, and the filtrate is discharged from the outlet hole of each filter plate through the filter medium. It is suitable for general filtering and has the advantages of fast filtering speed and intuitive filtering effect.
3. Undercurrent washable: it can be divided into undercurrent one-way washing and undercurrent two-way cross washing. The feed and washing liquid of this type of filter press are the same as that of open flow washing, but the liquid outlet method is different. The liquid of each filter plate is collected and discharged through the liquid outlet channel. This form is applicable to materials that are polluted, toxic, volatile and need washing.
4. Undercurrent non washable: in addition to the feeding channel, this type of filter press also has a liquid outlet channel. The filtrate of each filter plate is discharged together through this channel. This form is applicable to materials that are polluted, toxic, volatile and do not need washing.
Fourth, on the basis of practicality and materials, the principle of economy and environmental protection should also be taken into account. In this context of the COVID-19, when an enterprise purchases filter plates, if the goods are of high quality, the cheaper ones are more favored by the buyers.