In 2008 the U.S. Nuclear Regulatory Commission found fake and possibly faulty valves, pipes and electrical breakers — those not actually verified to stand up to the rigors posed by an operating reactor — at two nuclear facilities in the U.S. (scientificamerican.com)
Possible causes are worn piston rings, faulty valve seals, failed gaskets or warped engine components. (mechanics.stackexchange.com)
This spinning state could be caused by blockages in arteries that lessen blood pressure or by faulty valves that can not maintain blood pressure, says Dr. Miller. (health.com)