Terminology

Relay Emergency Valve

A Relay Emergency Valve are used on vehicle axles with service chambers only. They are designed to fill the reservoir(s), apply and releases the service brakes, and apply and releases emergency/park brakes when necessary. They are commonly used only on converter dollies, trailer turntable axles and liftable axles. They come in 'Charging' and 'Non-Charging' designs.

Terminology Index