1. Working principle and structural design
| Terms | swing check valve | silent check valve |
|---|---|---|
| Working principle | The valve disc is opened by the flow of the medium and is closed by its own weight or pressure when the medium flows in the reverse direction. | Through spring assistance or special flow channel design, fast closing is achieved to reduce the noise caused by valve disc impact |
| structural design | - The valve disc is disc-shaped or gate-shaped and fixed by a hinge pin. - The flow channel is streamlined with low resistance. |
- Short valve disc stroke, with damping device or slow closing structure - Built-in muffler or elastic seal |
2. Performance characteristics
| Comparison items | Swing check valve | Silent check valve |
|---|---|---|
| Noise control | The valve disc is easy to collide with the valve seat when closing, producing a loud water hammer sound, which is not suitable for noise-sensitive scenarios | Designed for noise reduction, fast closing speed (≤1 second), significantly reducing water hammer sound and vibration |
| Sealing performance | Metal seals are the main ones, and long-term use may cause slight leakage due to wear | Elastic seals (such as rubber/PTFE) are mostly used, which are more tightly sealed |
| Applicable flow and pressure | Applicable flow and pressure Suitable for large-diameter (DN≥50), low-flow, and stable-flow pipelines | Suitable for small and medium-diameter (DN≤300), medium-high pressure and pulsating flow scenarios |