In industrial pipeline systems, although check valves are not frequently operated valves, they play an important role in preventing medium backflow, protecting pump bodies, and maintaining system stability. Once the check function drops, it will not only cause Pressure fluctuation and abnormal flow, but also cause interlocking problems such as pump reverse rotation and water hammer impact.
Check valves are exposed to high temperature, high pressure, corrosion, or medium erosion environments for a long time, and their internal components will continue to wear out. Soft seals are prone to aging and cracking after long-term operation, while metal sealing surfaces may experience scratches and wear due to erosion; Containing particles or scaling media can also cause valve disc jamming and inflexible opening and closing. For spring check valves, long-term frequent operation can also accelerate spring fatigue and affect normal reset.
The maintenance cycle of check valves varies greatly under different operating conditions. Under normal temperature and low pressure conditions such as normal water supply and cooling water, it is usually recommended to check once every 6-12 months, and the overall replacement cycle is generally 5-8 years; However, working conditions such as high temperature steam, chemical corrosion, slurry particles, and frequent start stop often result in greater valve losses, and the replacement cycle is often shortened to 1-5 years.
In case of medium backflow, abnormal system Pressure, abnormal noise, vibration, seal leakage, or valve clack jamming, valve body corrosion, etc. during operation, it indicates that the valve has obvious risks and should be repaired or replaced in time to avoid further expansion of the fault.
Many system failures are not caused by damage to large equipment, but rather by a small component that has been overlooked for a long time. For check valves, regular inspection and preventive replacement are essentially aimed at reducing system operational risks in advance.
