Use "relief valve" in a sentence

1. Worse still new pipe work has been added, pressure relief valves removed and temporary bypasses installed and adapted

2. While he was at the top, more out of habit than by intent, he rubbed the dirt off the site glass on the pressure relief valve to check that the disc was in place

3. If something goes wrong and the pressure goes dangerously high a relief valve blows

4. There is a pressure relief valve and vent tunnel that a small party could pass through, single file

5. • Where pressure-relief valves and bursting discs are provided on storage vessels to protect them