Engine Management


Air Intake Valves

If flammable gas or vapour is drawn into the air intake of a diesel engine, it acts as an additional ungoverned fuel supply. This may result in uncontrolled engine overspeed followed by dangerous mechanical failure or flash back through the intake and the ignition of the surrounding gas or vapour cloud.

Once a flammable mixture is being drawn into the engine intake it may not be possible to stop the engine by closing down the fuel supply. For this reason an air intake valve must be fitted to ensure a guaranteed rapid and safe engine shutdown.

The Chawlyn shut down valves have metal to metal seals, different size options depending on power and physical size of the air intake and hazardous area options are available. 

Our Range

Pneumatic operated valves

Model #: Air Intake Valve - PVX, PVA

Product Overview

The PVX & PVA slim line valves will either open or close on the application of air pressure. A position indicator is on the top of the valve to show whether the valve is open or closed.

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Diesel Engine Air Intake Closure Valves

Model #: Air Intake Valves - Various

Product Overview

Simple cost effective automatic overspeed protection valves requiring no external power or signals. 

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Engine Management Categories

Control Panels

About Our range of Control Panel products monitor and control compressors, pumps, generators, and more. Control systems for industrial operations monitor pressure, temperature, liquid level, overspeed, time and vibra­tion. They cover it all, from simple start/stop operations to sophisticated automation systems incorporatiing micro controllers and remote telemetry. Give us a call at our head office on 03 9358 5555 and press Option 1.  


About CHALWYN is a leading manufacturer of safety products for diesel engines which are required to operate either in hazardous areas where combustible gas, vapors or dust may exist, or in situations demanding special safety precautions.   Following the introduction of the original and very successful CHALWYN D VALVE in 1972, the CHALWYN diesel engine safety product range now includes automatic over speed air and fuel shut off valves, air pressure, oil pressure, manual and electrically operated air intake shut down (shut off) valves, flameproof alternators, and exhaust spark arrestors.   Give us a call at our head office on 03 9358 5555 and press Option 1.   Chalwyn is a division of AMOT, a wholly-owned subsidiary of Roper Technologies, Inc (NYSE: ROP), a publicly traded company.


About Axiomatic provides electronic machine controls, components, and systems to the off-highway, military, power generation, material handling, industrial and alternate energy OEM markets. We provide efficient, innovative solutions that focus on adding value for our customers. An emphasis on service and partnership with our customers, suppliers, and employees builds long term relationships and mutual trust. Axiomatic is proud to be a qualified supplier to a number of major equipment manufacturers worldwide. Axiomatic focuses on its core competencies in controls engineering to reduce design costs, improve schedules, and develop an innovative product line. Give us a call at our head office on 03 9358 5555 and press Option 1.


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