Speed Switch For Refinery Or Gas-Plant Vehicles

The new Revguard speed switch from Chalwyn, an AMOT company, is suitable for vehicles working in refineries or gas plants. The new speed switch continuously monitors engine revolutions per minute (rev/min) and, should the engine rev/min exceed a preset limit, transmits a signal to close the air intake shut-off valve to stop an over-speeding diesel engine. Used on vehicles and stationary engines in the harsh Canadian climate, the compact and durable switches work with both 12V or 24V power and with a choice of speed input options.

Encapsulated against fuel, moisture and dirt, they have a -30C to +75C operating temperature range. Engine speed is monitored either via a magnetic pick-up mounted on the engine's flywheel housing or a pulse signal from the alternator. Having automatic reset, a local trip indicator, screw terminals to facilitate installation and an aluminium frame for ruggedness, they are compatible with Chalwyn energised-to-stop SVX valves or an air pressure system commonly found on larger trucks to activate a Chalwyn MPX or PVX intake shut-off valve.

Functionality also includes a simple test button that temporarily reduces the trip point to two thirds of the desired rev/min limit, enabling initial installation and system tests without over-speeding the engine. The trip point can be adjusted in the field, with a repeatability of less than one per cent deviation, and there is provision for a remote test switch enabling the demonstration of the system for a safety inspector. Also available for Chalwyn butterfly valves are actuation kits that include components to simplify installation.

Items in these kits include a manual override switch, a solenoid relay, a circuit breaker and fittings for pneumatic systems. A new Systems Guide booklet is available on request.

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