A check valve permits passage in one direction while automatically preventing reverse flow. For example, a check valve automatically closes against excessive downstream pressure for the uni-directional flow of gases in oil refinery piping.

Periodic maintenance includes cleaning, lubrication, and testing flow and back-flow pressure.

Here are troubleshooting actions to ensure optimal performance during operation:

• • Check that the installation aligns with the flow and also ensure a recommended pressure to activate the valve.

• • Visually verify that no obstructions exist within the valve, such as sediment, residue, or debris.

• • Examine the valve sealing areas for wear or damage to check valve closing issues.

• • If any parts (disc, seat, spring, hinge pin, etc.) have noticeable wear or damage, replace them.