That PCV was unable to reseal, likely due to a mechanical failure caused by “vibration-induced relaxation” between some threaded components inside the valve, the review board’s chair John ...

Every once in a while drivers might find oil in their engine's air filter, which is typically not where oil should be found. Here's the common culprit.

WASHINGTON — Astrobotic’s Peregrine lunar lander was unable to make it to the moon because of a failure of a single valve, leading to work to redesign the valve and overall propulsion system ...

A review board determined "the most likely cause of the malfunction was a failure of a single helium pressure control valve called a PCV—pressure control valve 2, within the propulsion system ...

The most common culprit in the case of oil in your engine's air filter is a single valve for your crankcase. In the anatomy of the typical car engine, the crankcase is where the up and down ...