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What is the installation location of the activated carbon filter?
Release Date:
2022-02-20
What is the installation location of an activated carbon filter? In typical low-pressure systems with pressures below 140 kg/cm², only a suction filter is usually installed; however, backflow filters and air filters are also required.
What is the installation location of the activated carbon filter?
In typical low-pressure equipment operating at pressures below 140 kg/cm², only a suction filter is usually installed; however, a backflow filter and an air filter are also required.
In conventional medium- and high-pressure fluid systems operating at pressures exceeding 140 kg/cm², countercurrent filters are typically used to control contaminant concentrations. However, when particularly stringent reliability requirements apply, high-pressure pipeline filters should be employed.
Terminal filters shall be installed on electromagnetic proportional control valves and low-flow regulating valves to enhance reliability.
When using a servo valve with an activated carbon filter, it is essential to minimize system contamination; therefore, high-pressure and return-line filters must be employed. For systems with larger capacities, end-of-line filters should be installed on the auxiliary lines to facilitate the operation of recirculating filters.
What are the precautions for using an activated carbon filter?
The typical installation locations for oil filters in hydraulic systems are as follows:
It should be installed at the pump’s suction port.
A surface-type oil filter is typically installed in the pump’s suction line to protect the hydraulic pump by removing larger contaminant particles. In addition, the filter’s flow capacity must be at least twice the pump’s flow rate, and its pressure drop must be less than 0.02 MPa.
Installed on the oil line at the pump outlet:
The purpose of installing an oil filter here is to remove contaminants that could enter components such as valves. The filtration accuracy must be 10–15 μm, the filter must be capable of withstanding both the operating pressure and the surge pressure in the oil circuit, and the pressure drop must be less than 0.35 MPa. It must also be installed concurrently.
The safety valve prevents the oil filter from becoming clogged.
Installed on the system’s oil intake line: this installation provides indirect filtration. A backpressure valve is typically installed in conjunction with the filter; when the filter reaches a specified pressure, the backpressure valve opens.
Installed on the system branch oil line.
Separate filtration system: Large hydraulic systems can be equipped with a dedicated hydraulic pump and oil filter to form an independent filtration circuit.
In addition to the oil filters required for the entire hydraulic system, dedicated filters are often installed separately upstream of critical components such as servo valves and precision throttles to ensure proper operation.
What are the selection principles for activated carbon filters?
1. Import and export routes:
In principle, the inlet and outlet ports of the filter shall not be smaller than the inlet port of the associated pump; typically, they should match the nominal diameter of the inlet piping.
2. Nominal pressure:
Determine the pressure rating of the filter based on the maximum pressure that may occur in the filter piping.
3. Hole count selection:
The primary consideration is the particle size of impurities that need to be intercepted based on the process requirements of the medium. The diameter sizes that can be intercepted by wire meshes of various specifications are listed in the “Filtering Specifications” table below.
4. Filter material:
The material of the filter is typically the same as that of the connected process piping; depending on the service conditions, filters may be made from cast iron, carbon steel, low-alloy steel, or stainless steel.
5. Filter Resistor Loss Calculation
For water filters, the pressure drop at the typical rated flow rate is 0.52 to 1.2 kPa.
Keywords:
Activated carbon filter
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