valve

活瓣, 阀, 活门

a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it; device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone; control consisting of a mechanical device for controlling the flow of a fluid; the entire one-piece shell of a snail and certain other molluscs

装阀, 用阀调节