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Rückschlagklappe f
gen.	flap valve; backdraft damper
airccon.	checkvalve
coal., mech.eng.	back-pressure valve
construct.	back valve; inverted valve
energ.ind., industr.	flow-valve
mech.eng.	automatic non-return valve; disk of a swing check valve; clack valve; swing-type check mechanism; valve clack of a check valve; valve flap of a check valve
mining.	detonation trap
nat.res.	reflux valve
tech.	check valve; non-return flap; non-return valve; back draft damper; nonreturn valve; swing check valve
RAT Rückschlagklappe f
construct.	non-return damper

Rückschlagklappe: 2 phrases in 2 subjects

Construction	1
Technology	1