Malfunction | Cause | Elimination |
---|---|---|
No flow | The pressure difference on the valve disc is less than the opening pressure | Increase the pressure before the check valve or reduce the pressure after it |
-//- | During installation, the plug of the passage hole or the disc holder was not removed | Disassemble the check valve and remove the plug/holder |
The valve does not tightly close the flow | The seat or disc is damaged by foreign bodies | Replace the check valve | -//- | A solid particle got under the disc | 1. Try to wash out the particle with the flow, for this, open/close the shut-off valve near the valve several times. 2. Drain the pipeline, disassemble the valve, and remove the particle. |
The check valve is knocking | A too large diameter of the valve was selected | 1. Install a smaller diameter valve 2. Install a disc damper (this option is only available for some types of check valves) |
-//- | - high flow turbulence - the check valve is installed too close to the centrifugal pump - vibration of the pipeline |
Change the installation location of the check valve |
Breakage of the check valve flange | The valve is subject to loads from connected pipelines | Unload the valve body by installing additional supports or compensators for thermal expansion |
-//- | The bolts are tightened unilaterally or the corresponding flanges are not co-planar | Perform even tightening of the bolts, eliminate the non-coplanarity of the flanges |
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