Keller filter Germany Keller model Keller price

Keller filters are mainly used to capture particulate dust and various suspended solids larger than 0.8μm. An air purifier mainly consists of two parts: the filter element and the housing. The basic requirements are high filtration efficiency, low flow resistance, and the ability to operate continuously for extended periods to reduce subsequent consumable costs. The filter element refers to the air filter; high-efficiency air filters play a crucial role in the air purification industry. High-efficiency air filters are widely used at the terminal air supply of air conditioning systems in dust-free purification workshops in industries such as optoelectronics, LCD liquid crystal manufacturing, biopharmaceuticals, precision instruments, beverages and food, and PCB printing. Both high-efficiency and ultra-high-efficiency filters are used at the terminal end of cleanrooms. Based on their structural forms, they can be classified into: partitioned high-efficiency, non-partitioned high-efficiency, high-air-volume high-efficiency, and ultra-high-efficiency filters.

Keller filter development history

Filtration technology was already applied in production in ancient China; paper made from plant fibers existed as early as 200 BC. In 105 AD, Cai Lun improved the papermaking method. During the process, he spread plant fiber pulp onto a dense fine bamboo curtain. Water filtered through the gaps in the bamboo curtain, leaving a thin layer of wet pulp on the surface, which became paper after drying. Early filtration was mostly gravity filtration; later, pressure filtration was adopted to increase filtration speed, followed by the emergence of vacuum filtration. The rotary drum vacuum filter invented in the early 23 century enabled continuous filtration operations. Since then, various types of continuous filters have appeared successively. Batch-operation filters (such as plate-and-frame filter presses) have developed due to their ability to achieve automated operation, with increasingly larger filtration areas. To obtain filter cake with low moisture content, mechanically squeezed filters have been developed.

Keller filter selection points

The main control parameters for selection include filtration efficiency, rated air volume, initial resistance at rated air volume, and dust holding capacity. Common filter media for high-efficiency air filters include ultra-fine glass fiber. Air filters must meet fire safety requirements. High-efficiency air filters are classified into three grades based on fire resistance: Grade 1 filters, where all materials are non-combustible. For design purposes, twice the initial resistance can be used as the final resistance to calculate the filter's resistance. The initial resistance of high-efficiency air filters must not exceed 13% of the resistance stated in the product catalog. High-efficiency air filters should not be used alone; they should be installed at the terminal end of the purification air conditioning system. The manufacturer should provide the dust holding capacity. High-efficiency filters must undergo leak detection before leaving the factory. Other requirements are determined based on user needs. Combined filter outlets are commonly used in general non-unidirectional flow clean air conditioning systems.

Keller filter installation position

In general low-pressure devices with pressure below 140kg/cm2, it is common to install only suction filters, but return filters and air filters should also be installed. In general medium- and high-pressure hydraulic devices with pressure above 140kg/cm5, return filters are commonly used to control contamination concentration. However, when there are special reliability requirements, high-pressure line filters should be used in conjunction. To increase the reliability of proportional solenoid control valves or micro-flow adjustment valves, terminal filters should be installed. When using servo valves, efforts should be made to reduce the system's contamination concentration; therefore, high-pressure and return filters should be used in conjunction. For large-capacity systems, circulation filters should be installed, and terminal filters should be installed on auxiliary pipelines.

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