Air Intake Shut Off Valves Stop Engine Runaway


Air Intake Shut Off Valves Stop Engine Runaway

Air intake shut off valves provide emergency overspeed shutdown protection for diesel engines and are the most effective way of preventing a runaway situation. The valves completely block the engine air intake system, cutting off an uncontrolled external fuel source and the air required to keep the engine running. AMOT has an extensive range of fully automatic and manual positive air shut off systems (PASS) designed to fit engines of all sizes. Our products include AMOT & Chalwyn brands.

The Chalwyn D and 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 open soon after the engine has stopped, so the engine is ready for re-starting.

The Model D is the basic version of the automatic valve. The D-AM is the 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 3 size ranges and are selected by combination of the engine power at its rated speed and the air intake line bore size.

D Valve Range Engine Power Air Intake Hose Size
kW HP mm in
Mini (Mini-Bendix) 1.5-27 2-36 25 - 58 1 - 2(1⁄4)
Standard (Bendix) 7.5-179 10-240 40 - 108 1(9/16) - 4(1⁄4)
Large (Spindle) 80 – 600 107 - 805 76 - 229 3 - 9