Common causes of failure of swing check valves include:
1. Sealing failure:
Wear, aging or damage to the valve sealing surface or sealing ring, resulting in reduced valve sealing performance.
2. Improper tightening:
Improper tightening of the valve nut or loose threads, resulting in unstable valve operation or failure to close completely.
3. Internal fouling:
After long-term use, dirt or sediment will accumulate inside the valve, causing the valve to fail to open or close normally.
4. Wear of internal parts:
Internal parts of the valve, such as the valve disc or valve seat, will wear or deform due to long-term use or improper operation, affecting the normal operation of the valve.
5. Rust or corrosion:
The internal or external parts of the valve are corroded by water quality or environment, causing the valve parts to rust, deform or damage.
6. Leakage:
Valve leakage caused by poor valve sealing or damaged parts may be due to improper installation, wear or failure of the sealing ring.