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D Automatic Air Shut Off Valve

SKU Chalwyn-D

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 restarting.

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.

Features and Benefits

  • Easy to install
  • No external power source or speed signal required
  • Air flow actuated
  • Automatic reset after engine stops


  • Drilling rigs
  • Drilling support equipment
  • Well servicing equipment
  • Refinery support equipment
  • Bulk haulers and tankers
  • Construction equipment
  • Generator sets
  • Emergency response vehicles
  • Work boats
  • Barges
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More Information


Size (in)2.5"
End ConnectionHose Barb
ActuationAir Flow Actuated
Position Indication AvailableNo
Position Indication LogicValve Open - Switch Open
Elbow KitValve Only (No Elbow)
StyleAir Flow Actuated
Max Air Intake Temp (F)257
Min Air Intake Temp (F)-40
Max Pressure (psi)TBD
IP ProtectionNo
Hazardous Location CertificationTBD
Power To Close or Energize To Run (Fail Safe)Power-to-Close
ResetAuto Reset