11. A high pressure relief valve provided overpressure protection to the hydraulic system and relieved at. 12. Pressure relief valves are inspected at every loading.13. Testing is also performed to evaluate a company s ability to properly repair pressure relief valves . 14. One would need an " adjustable " pressure relief valve to ensure this did not happen. 15. The pentagonal hole in the pressure relief valve is designed as a vent, not a key socket. 16. :: : : : It would depend on whether the pressure relief valve is triggered, or not. 17. It is a pressure relief valve , and is normally operated by the vacuum from the intake manifold. 18. The cylinder covers of engines as built were fitted with " screw-in " type pressure relief valves . 19. However, you could also put a pressure relief valve in instead of a hole or loose top. 20. High pressure, sealed solar thermal systems ultimately rely on the operation of temperature and pressure relief valves .