In industrial piping systems, although the check valve is not a type of valve that requires frequent operation, it plays an important role in preventing medium backflow, protecting the pump body, and maintaining system stability. Once the check function deteriorates, it may not only cause pressure fluctuations and flow abnormalities, but also trigger chain problems such as pump reverse rotation and water hammer impact.
When a check valve operates for a long time in environments with high temperature, high pressure, corrosion, or medium scouring, its internal components will experience continuous wear. Soft seals tend to age and crack after long-term operation, while metal sealing surfaces may suffer from scratches and wear due to scouring. Media containing particles or scale can also cause the disc to stick, making opening and closing inflexible. For spring-loaded check valves, frequent cycling over time can accelerate spring fatigue, affecting proper reseating.
The maintenance intervals for check valves vary significantly depending on operating conditions. For ordinary room-temperature, low-pressure conditions such as general water supply or cooling water systems, it is typically recommended to perform inspections every 6 to 12 months, with an overall replacement cycle of 5 to 8 years. For more severe conditions—such as high-temperature steam, chemical corrosion, slurry containing particles, or frequent start/stop operations—valve wear is accelerated, and the replacement cycle is often shortened to 1 to 5 years.
If during operation any of the following signs appear—medium backflow, abnormal system pressure, unusual noise or vibration, sealing leakage, disc sticking, or visible valve body corrosion—these indicate that the valve is already at significant risk. Timely repair or replacement should be carried out to prevent further escalation of the problem.
Many system failures are not caused by damage to large equipment, but rather originate from a small component that has been neglected for a long time. For check valves, regular inspection and preventive replacement are essentially measures to reduce system operational risks in advance.
