Maintenance of the check valve

The frequency and scope of maintenance are determined by technical personnel depending on the operating conditions of the check valve. It is recommended to check the valve's performance at least once a month.

Possible malfunctions and troubleshooting methods

Malfunction	Cause	Solution
No flow	The pressure difference across the valve disc is less than the opening pressure	Increase the pressure before the check valve or decrease the pressure after it
-//-	The plug or stopper of the passage was not removed during installation	Disassemble the check valve and remove the plug/stopper
The valve is not sealing properly	The seat or disc is damaged	Replace the check valve
-//-	A solid particle is stuck under the disc	1. Try to flush out the particle by repeatedly opening/closing the shut-off valve near the check valve. 2. Drain the pipeline, disassemble the valve, and remove the particle.
The check valve is knocking	The valve diameter is too large	1. Install a smaller diameter valve 2. Install a disc damper (this option is available only for some types of check valves)
-//-	- high flow turbulence - the check valve is installed too close to the pump - pipeline vibration	Change the installation location of the check valve
Check valve flange failure	The valve is subjected to stresses from the connected pipelines	Relieve the valve body by installing additional supports or thermal expansion compensators
-//-	Bolts are unevenly tightened or flanges are misaligned	Perform even bolt tightening, correct flange misalignment