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automatic non-return valve
mech.eng.	clapet antiretour; clapet automatique de non-retour; clapet de non retour; clapet de retenue; soupape antiretour; soupape de non retour; soupape de retenue
transp., mech.eng.	vanne à clapet automatique de non-retour; vanne à soupape automatique de non-retour