双联过滤器是也称双联切换过滤器，它是由两台不锈钢过滤器并联而成，具有结构新颖合理、密封性好、流通能力强、操作简便等诸多优点，应用范围广泛、适应性强的多用途过滤设备。尤其是滤袋侧漏机率小，能准确地保证过滤精度，并能快捷地更换滤袋，过滤基本无物料消耗，使得操作成本降低。
Areas of application
The KDWF change-over filter consists of two KWF series filters with intermediate-positioned ball cock change-over.
It is a filter for liquid, gaseous, or pasty media that offers versatile implementation. It is characterized by high performance, low spatial requirements, as well as fast and easy cleaning.Inlet and outlet flange can be positioned as desired.
Brief description
In the standard version the filter consists of two welded steel vessels with covers that are fastened via screws and nuts. Alternatively the filter can be equipped with a strainer, ringer strainer insert or cartridges, or bag filters.
Installation
The filter is installed in pipelines via flanges. Ensure that the standard version filter is installed vertically without additional mechanical stress, tension-free.The medium must flow in the direction specified on the vessel. Incorrect installation can cause malfunctions and damage to the filter.
Commissioning/operating instructions
1. Open the vent until liquid escapes.
2. Close vent.
3. Filter is ready for operation.
4. The lever points toward the filter pot that is in operation.
| Standard version | Special version or supplemental equipment | ||
| Filter insert | Strainer insert | Ring strainer insert double strainer | Double strainers, ple-ated strainer insert, cartridges, bags |
| Degree of filtration | 10 - 1000 μm; > 1 mm: perforated plate with round perforation | ||
| Filter opening | Through screws with nuts, (Fig. 1) | Snap closings | |
| Vent | Screw | Ball cock | |
| Drain | Screw | Ball cock | |
| Connection | Height-offset according to the design pressu-re of the filter inlet and outlet | As specified by customer | |
| Materials: | |||
| Vessel and cover | St 35.8, P 265 GH, 1.4541, 1.4571 | Special materials | |
| Filter opening | In accordance with the vessel material | - | |
| Cover seal | Asbestos-free flat seal | O-Ring: NBR, FPM, EPDM, MPO, PTFE | |
| Perforated plate/mesh | St, St/1.4401, 1.4301, 1.4301/1.4401 | 1.4571/1.4401, MS/Bz, Hastelloy C 4, various plastics | |
| Attachment parts | VA | ||
| Supplemental filter | - | Magnetic filter insert | |
| Heater | - | Steam, hot water or electrical heater | |
| Differential pressure indicator | - | Optical, electrical | |
| Surface treatment interior:* | |||
| Vessel steel | Preservation oil | Corrosion protection lacquer, epoxy resin, E-CTFE | |
| Vessel stainless steel | Glass-shot blasted | Pickled and passivated, electro-polished | |
| Vessel plastic PP, PE, PVDF, GFK/FRP | |||
| Surface treatment exterior: | |||
| Vessel steel | Synthetic resin lacquer, RAL 5010 blue | Rubberized, epoxy-coated, as well as customer-specific | |
| Vessel stainless steel | Glass-shot blasted | Pickled and passivated | |
