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Home » Backflow Testing, Repair, Installation » The PVB Common Fail Documented with amazing photos.

The PVB Common Fail Documented with amazing photos.

Testing the PVB the Air Inlet Opened fine, But the Check Valve failed.

Testing the PVB the Air Inlet Opened fine, But the Check Valve failed.

Let's open it up and see what is inside.

Let’s open it up and see what is inside.

A little debris inside if you look carefully.

A little debris inside if you look carefully.

That is nice size pebble or rock in side that was preventing the check valve from closing.

That is nice size pebble or rock in side that was preventing the check valve from closing.

Time to Flush.

Time to Flush.

More flush time.

More flush time.

Now the check valve is holding above 1 lb of pressure.

Now the check valve is holding above 1 lb of pressure.

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