How to Select and Apply Filters of Various Styles

1. Single-tube Filter
   • Structural Features: Uses a single filter tube as the core filtration unit, with a simple and compact structure. It usually contains a filter element (such as a metal mesh, paper, or chemical fiber filter element) and realizes medium filtration through a single flow channel.
   • Advantages: Easy to install, low cost, and suitable for low-flow scenarios.
   • Applicable Scenarios:
     • Water or air filtration in small-flow equipment such as household small air conditioners and water dispensers;
     • Preliminary impurity filtration (e.g., rust, sediment) in pipeline systems to protect downstream components (such as valves and water pumps).
2. Dual-tube Filter
   • Structural Features: Consists of two parallel filter tubes, which can be designed in "one in use and one standby" or "simultaneous operation" mode. Some models are equipped with switching valves, facilitating filter element replacement without interrupting system operation.
   • Advantages: Higher filtration efficiency (when dual tubes work simultaneously) or support for online maintenance (single tube operation while the other is replaced), making it suitable for systems requiring continuous operation.
   • Applicable Scenarios:
     • Occasions with high continuity requirements such as commercial air conditioners and small industrial circulating water systems;
     • Pipelines with large medium flow where single-tube filtration capacity is insufficient (e.g., cooling water loops, compressed air pipelines).
3. Welded Filter
   • Structural Features: The shell, interfaces, and other components of the filter are fixedly connected through welding processes, with no detachable flanges or threaded structures. It has extremely strong sealing performance and good pressure resistance.
   • Advantages: Suitable for high-pressure, high-temperature, or strongly corrosive environments, and not prone to leakage.
   • Notes: Maintenance requires cutting the welded parts to replace the filter element, which is relatively complex. Therefore, it is more suitable for scenarios with long-term operation and low maintenance frequency.
   • Applicable Scenarios:
     • Filtration of high-pressure refrigerant pipelines in industrial air conditioners and corrosive media in chemical production;
     • Pipeline systems with strict sealing requirements (e.g., refrigerant filtration in refrigeration units).
4. Iron Filter
   • Material Features: Uses cast iron or carbon steel as the main shell material, which has high hardness and low cost but poor corrosion resistance (prone to rust). It usually needs to be painted, galvanized, or treated with other methods to improve rust resistance.
   • Advantages: High mechanical strength, suitable for scenarios with large pressure or impact.
   • Applicable Scenarios:
     • Pipeline filtration for transporting normal-temperature, non-corrosive media (such as ordinary tap water and air) in industrial environments;
     • Occasions sensitive to cost and with non-corrosive media (e.g., agricultural irrigation systems, water inlet filtration for small boilers).

Selection Suggestions

1. Based on flow and continuity requirements: For small flow and intermittent operation, choose single-tube filters; for large flow and continuous operation (such as commercial air conditioners), choose dual-tube filters.
2. Based on pressure and sealing requirements: For high-pressure, high-temperature, or corrosive environments, choose welded filters; for normal pressure and non-corrosive environments, other types can be selected.