Check and Relief Valve

Check And Relief Valve:

- Remove the valve.
- Apply less than 40 mmHg pressure to the tank side of the valve.
Air should not pass through valve.

- Apply 40 mmHg pressure to the tank side of the valve.
Air should pass through valve.

- Apply less than 20 mmHg vacuum to the tank side of the valve.
Air should not pass through valve.

- Apply 20 mmHg vacuum to the tank side of the valve.
Air should pass through valve.

- Replace the valve if it fails the above tests.