1. Connection method and structural design
| Terms | Wafer type check valve | Flange Check Valve |
|---|---|---|
| Connection Type | Clamped between two flanges by bolts, no self-contained flange | Both ends of the valve body are equipped with flanges, which are fastened with pipe flange bolts. |
| Structural features | Compact design, thin valve body and light weight | The overall structure is heavy and requires independent support structure |
| Typical valve type | Double plate wafer type, butterfly wafer type | Mainly swing type and lifting type |
2. Scope of application and medium characteristics
Applicable diameter
Wafer type: DN15-DN600 (mainstream DN≤300)
Flange type: DN50 and above (swing type can be expanded to DN600+)
Pressure level
Wafer type: Class150-Class900 (special design required for high-pressure scenarios)
Flange type: Class150-Class2500 (obvious advantages in high-pressure conditions)
Medium compatibility
Wafer type: solid particles or high-viscosity media are not recommended
Flange type: swing type can handle media containing impurities, and lifting type is more suitable for clean fluids
3. Comparison of sealing performance
| Working conditions | Wafer type check valve | Flange Check Valve |
|---|---|---|
| Low pressure seal | Spring assisted closing, better sealing at low pressure | Depends on medium pressure and valve disc deadweight, prone to leakage at low pressure |
| High pressure seal | Special valve seat design is required, and long-term high pressure will cause wear. | Metal valve seat + heavy hammer structure, high pressure sealing and stable |
4. Fluid resistance and energy consumption
Wafer type: The spring-loaded structure may cause the flow channel to bend, and the resistance is large (the energy consumption in the applicable scenario increases by about 5-10%)
Flange type: The swing-type streamlined channel has low resistance, and the butterfly flange valve has even lower resistance
5. Installation and maintenance
Installation complexity
Wafer type: The flange bolt holes need to be precisely aligned, and the installation accuracy requirements are high
Flange type: The built-in flange is easy to position, but an additional support structure is required to prevent pipeline stress deformation
Maintenance convenience
Wafer type: Small size, easy to disassemble and assemble, but the spring assembly needs to be checked regularly
Flange type: The entire valve needs to be disassembled for maintenance, but the pin and other parts have a longer life
6. Economic Comparison
| Terms | Wafer type check valve | Flange Check Valve |
|---|---|---|
| Manufacturing cost | Less material consumption (30-50% less than flange type of the same specification) | Complex structure, large-diameter valves significantly increase cost |
| Preferred scene | Small and medium diameter piping systems with limited space | High-pressure/large-diameter industrial pipelines and impure media scenarios |
