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Explanation: Possibly? Bearing in mind that "yield" is much the same as "release" in this context.
David Moore Local time: 13:08 Native speaker of: English PRO pts in category: 11
Notes to answerer
Asker: Thanks! I also just got the correct term from a mining specialist:
"Gebirgsschlagventil" (rapid here refers to the release upon sudden impact of falling rock exceeding a certain speed)
Heinz von Bockelmann