The Chalwyn D-AM automatic valves are self-contained with flow actuated overspeed shutdown. They require no external electrical or mechanical input devices. The closing force is provided by the intake air flow passing through the valve. The valve closes automatically when the engine speed exceeds a pre-set point. The valve automatically resets to the open position soon after the engine has stopped, so the engine is ready for re-starting.

 

The D-AM is an automatic valve with a manually operated pull “T” handle cable stop. The cable is available in lengths of 1.0, 1.5, 2.0, and 3.0 meters. 

 

The valves are available in several size ranges and are selected based on a combination of the engine power at its rated speed and the air intake line bore size.