Globe Check Valve

check valve
A mechanical device in a pipe that permits the flow of water or air in one direction only.
A valve that closes to prevent backward flow of liquid
A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.
Limits the flow of gas to one direction only. Use a check valve between the bubbler and generator to prevent unwanted pressure build up in the generator, and a safety against a low level bubbler. A check valve, such as used on torches, is recommended.

globe
The earth
A spherical representation of the earth or of the constellations with a map on the surface
A spherical or rounded object
Earth: the 3rd planet from the sun; the planet we live on; "the Earth moves around the sun"; "he sailed around the world"
ball: an object with a spherical shape; "a ball of fire"
a sphere on which a map (especially of the earth) is represented