Shuttle Valves

A shuttle valve can allow a pneumatic device connected to its outlet to be operated by either of two control valves connected to the shuttle valve inlets. These valves perform their functions automatically according to the air flow conditions in the systems. Shuttle Valves have three connecting ports, two inlets and one outlet. The inlet which is pressurized first, or with the highest pressure applied, is automatically connected to the outlet, and the alternate supply source is closed off by a shuttle element. The blocking shuttle element will remain in this condition until the pressure is removed, or higher pressure is applied to the opposite inlet port. A shuttle valve should not be used as a pressure selector