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The selection of the bag filter pulse valve is an important link to ensure the efficient operation and long-term stable work of the dust collector. In practical applications, the selection of pulse valves needs to comprehensively consider multiple factors to ensure their performance and reliability under different working conditions. ,

The processing air volume is matched with the injection air volume

The selection of pulse valves should be based on the actual air volume processed by the dust collector to determine their specifications and quantity. Meanwhile, the injection air volume should be matched with the area and quantity of the filter bags to ensure that each filter bag can achieve a sufficient dust cleaning effect. For example, the Φ130 bag can be connected to a maximum of 20 bags per pulse valve, and the Φ160 bag can be connected to a maximum of 16 bags per pulse valve. In addition, each pulse valve generally does not exceed 50 square meters of injection, and at most does not exceed 60 square meters.

2. The blowing pressure is compatible with the material of the filter bag

The selection of the blowing pressure should be determined based on the material and specification of the filter bag. Filter bags made of different materials have different requirements for injection pressure. For instance, glass fiber filter bags typically need a lower injection pressure, while polyester filter bags may require a higher one. Meanwhile, the blowing pressure should meet the pressure resistance requirements of the filter bags to prevent the filter bags from being damaged due to excessive pressure.

3. Material selection and service life

The material of the pulse valve should be selected based on the usage environment and the characteristics of the medium. For example, in corrosive media, it is advisable to choose plastic King solenoid valves or all-stainless steel ones. In highly corrosive media, the barrier diaphragm type structure should be selected. In neutral media, copper alloy valve housings are preferred. Copper materials should not be selected in an ammonia environment. In explosive environments, explosion-proof grade products should be selected. In addition, the diaphragm of the pulse valve should have a service life of more than one million times or three years.

4. Installation method and structural design

The installation method of the pulse valve should be selected according to its type and the structure of the dust collector. For instance, submerged pulse valves should be horizontally arranged on the pressure stabilizing air tank. The center of the output port should coincide with the center of the valve body and must not be offset or tilted. At the same time, the installation of the blow pipe should ensure that the nozzle opening is aligned with the center of the filter bag to avoid tilting, and the pipe fitting nuts should be tightened. In addition, the connection between the pulse valve and the blow pipe should adopt through-wall connectors and comply with relevant standards.

5. Gas source conditions and cleanliness

The air source of the pulse valve should meet certain pressure and cleanliness requirements. The air source pressure should be between 0.1MPa and 0.8MPa, and the air source should undergo oil and water removal treatment to ensure the cleanliness of the injection airflow. The humidity of the air source should be such that the pressure dew point temperature is not more than 5℃ higher than the local ambient temperature, the solid particles should not be larger than 5μm, and the oil content should not exceed 5mg/m³. In addition, impurities should be prevented from entering the air tank to avoid damaging the diaphragm or blocking the air holes.

6. Action Frequency and reliability

The operating frequency of the pulse valve should be selected based on the operating conditions of the dust collector. Under high-frequency operating conditions, direct-acting solenoid valves should be preferred to ensure the reliability and stability of their actions. Meanwhile, the insulation performance of the electromagnetic coil should meet the IP65 standard in GB 4208-2008 to prevent external dust from entering. In addition, the opening and closing time of the pulse valve should meet the control requirements, usually ranging from 80 to 200ms.

7. Remote transmission control and distance limitation

The remote transmission distance between the electromagnetic pilot valve and the pulse valve should be limited according to the type of connecting pipeline. For example, when using a standard nylon hose with an outer diameter of 6mm, the maximum long-distance transmission distance should be no less than 3m. When using standard nylon hoses with an outer diameter of 8mm or 10mm, the maximum long-distance transmission distance should not be less than 2m. When using metal pipes, the maximum long-distance transmission distance should be no less than 2 meters. In addition, the installation of the remote pilot control box should ensure a stable connection between it and the pulse valve.

8. Maintenance and Inspection

Pulse valves should be inspected and maintained regularly during installation and operation to ensure their normal operation. For instance, it is necessary to regularly check whether the diaphragm is damaged, whether the nozzle is clogged, and whether the air source is clean. In addition, the pulse valve should be lubricated before installation and the lock nut should be tightened after installation to prevent air leakage. Meanwhile, the operation conditions of control valves, pulse valves and timers, etc. should be checked regularly to ensure their normal operation.

9. Explosion-proof and anti-corrosion requirements

In flammable and explosive environments, pulse valves of explosion-proof grades should be selected and comply with the requirements of GB 3836.1 and related explosion-proof standards. In corrosive medium environments, pulse valves with anti-corrosion performance should be selected and comply with the relevant provisions of GB/T 14093.4-2009. In addition, the surface of the pulse valve should undergo anti-corrosion treatment, without coating peeling, burrs or cracks.

10. Testing and Inspection

The selection and manufacture of pulse valves should comply with relevant standards and pass type inspection and factory inspection. Type inspection should be conducted during the trial production of new products, changes in production processes and materials, once a year during normal production, or as required by the superior quality inspection department. The sampling methods and judgment rules should be specified in detail. For factory inspection, 5% of the products should be randomly selected for sampling inspection. If any of them are found to be substandard, the sampling inspection should be doubled. If there are still substandard products, they need to be reworked and pass the full inspection before leaving the factory.

The selection of the bag filter pulse valve needs to comprehensively consider multiple aspects such as the processing air volume, injection pressure, material, installation method, air source conditions, action frequency, remote control, maintenance inspection, explosion-proof and anti-corrosion requirements, as well as tests and inspections. Only when all these factors are fully considered and reasonably configured can the efficient operation and long-term stable work of the bag filter be ensured.

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Shanghai Bag Filtration Equipment Co., Ltd.

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