# Valves Valves are a quick way to halt or permit gas flow through a [textlink="pipenet" link="PipeNetworks"]. All valves do not require [textlink="power" link="Power"] to operate. Valves may look simple, but they can enable a wide variety of complex pipe systems, including: - Signal valves responding to air alarm or logic gate outputs - Pneumatic valves controlling variable venting of waste gasses from a burn chamber