1. Differences in structure and action characteristics
Swing check valve
The valve disc is disc-shaped and rotates around the pin outside the valve seat. It is opened and closed by the rocker and bracket
The flow channel inside the valve is linear, and the fluid resistance is small
The closing speed is slow and water hammer is easy to occur
Lift check valve
The valve disc slides along the vertical center line of the valve body, and the guide sleeve controls the lifting of the valve disc
The valve body shape is similar to the stop valve, and the fluid resistance is large
The closing speed is fast and the sealing performance is better
2. Comparison of performance and application scenarios
| Terms | swing check valve | lift check valve |
|---|---|---|
| Sealing performance | Low-pressure sealing is weak and not suitable for pulsating flow | Good high pressure sealing, suitable for clean media |
| Fluid resistance | Streamlined channel with less resistance | The valve body structure is complex and the resistance is large |
| Applicable diameter | Suitable for large diameter pipes DN ≥ 50mm | More suitable for small and medium-caliber high-pressure scenarios with DN ≤ 50mm |
| Installation Restrictions | Supports horizontal, vertical or inclined installation. Vertical installation requires the medium to be from bottom to top. | Only horizontal installation is allowed. Vertical pipes need to choose special vertical structures. |
| Media adaptability | Can handle media containing solid particles | Use only cleaning media |
| Cost | Simple structure and low production cost | High processing precision requirements and slightly higher costs |
3. Typical application scenarios
Swing type:
Low flow rate, Large flow scenarios (such as municipal water supply mains)
Medium containing particles or high viscosity (such as sewage treatment systems)
Lifting type:
High-pressure steam pipelines (such as power plant boiler systems)
Clean liquid systems that need to be quickly closed to prevent backflow (such as chemical pump outlets)
4. Selection recommendations
Preferentially choose the swing type: large diameter, low flow rate, medium containing impurities or limited budget scenarios
Preferentially choose the lifting type: high pressure, small diameter, high sealing requirements or systems that need to be closed quickly
Pulsating flow or frequent opening and closing conditions recommend butterfly or slow closing check valves