air valve

Historical Examples of air valve

• It was the kind of door that shuts with an air-valve, and it closed gradually, tranquilly, like velvet; a perfect lady of a door.

  Life's Minor Collisions

  Frances Warner

• He stopped the engines, opened the air-valve, and the great ship instantly began to settle quietly down.

  With Airship and Submarine

  Harry Collingwood

• The professor opened the air-valve and the ship at once began to settle down.

  The Log of the Flying Fish

  Harry Collingwood

• If now the air-valve be opened very slightly, an internal cone of the same blue colour makes its appearance.

  Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4

  Various