The CHALWYN’ System Selection Guides provide an overview of the most common types of air intake shutoff systems used to prevent diesel engine overspeed or runaway. We have a wide range of fully automatic and manual shutoff systems and will help you find a system that meets your requirements.

Air intake shutdown valves (often referred to as AISV, ASOV or Emergency Shutdown valves, ESD) and systems 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.

• Air Intake Shut Down Valves (manual, electric, oil, air…)

Chalwyn Revguard Speed Switches detect the hazard of an overspeed condition. When engine RPMs exceed the Revguard’s program setpoint, the output is energized, providing the signal to actuate the air intake shutoff valve(s) to shut off your engine.

• Revguard 2 Speed Switch

European standards (EN 1834-1:2000) covers diesel engine operation in Zone 1 or Zone 2 hazardous areas where flammable gas or vapor may exist, requires that both the engine fuel and intake air supply are automatically shut down if engine overspeed occurs.

• FSX-200 Air Intake Depression Diesel Fuel Shutoff Valve (CE226)

Chalwyn offers electrical sensors to provide complete electro automotive shut down control systems for engines operating in hazardous areas.

• PSX-010 Pressure Sensor (CE305)

Diesel Engine exhaust spark arrestors are a basic but key safety feature for both hazardous area and lower risk diesel engine applications such as forestry or agriculture where a stray spark may cause ignition of combustible material. Virtually all legislation regarding the operation of a diesel engine in a hazardous area includes a mandatory requirement to fit a tested and approved exhaust spark arrestor.

• SAS Small Engine Spark Arrestor (CE224)
• SSE End of Exhaust Spark Arrestor (CE224)
• SSL Spark Arrestor / Silencer (CE224)
• SSN Advanced Flow Range Spark Arrestor (CE224)