Gas cylinder valves regulate the flow of pressurized gas. Usually attached via threaded connections and featuring an accessible handle or knob for opening/closing purposes, these devices serve to manage pressurized gas flows within pressurized vessels.

Gas cylinder valves come in various styles.
CGA valves are standard valves used in North America that are designed for specific gas cylinder types.
DIN valves are standard valves used in Europe. They are designed for specific gas cylinder types.
Acetylene Valve: This is a specialized valve that is used with acetylene cylinders. It has a different design from other types of gas valves.