Assured Automation: Thermal Shutoffs for Pneumatic Actuators

Oct. 9, 2015

The FM-approved FireChek thermal shutoffs with resettable memory shape alloy can be used to automatically shut down a pneumatic control system when a nearby fire occurs, or when the ambient temperature reaches 135, 150, or 165 °F.

When the device senses excessive heat from a nearby fire, it immediately closes the air supply line, preventing the air from feeding the fire, while venting the spring return actuator to allow the return to fail-safe. It triggers quickly, securing pneumatically operated process line valves in their fail-safe position for both on/off and throttling applications. Its testability and reset ability makes it a preferable to emergency isolation valves that rely on fusible links or plastic burn-through tubing. The shape memory element is 100% reliable because the shape memory effect is intrinsic to the alloy. Shape memory alloys have performed successfully for many years in military, industrial, and consumer product applications. The manual reset allows routine performance testing for safety maintenance programs. Three different configurations are available: directly mounted between the pneumatic supply and spring return actuator via two NPT threaded connections; with Quick Exhaust, which allows for the spring return actuator to move to the failsafe position much faster; and combined with a SIL Class III pilot valve, either with or without a solenoid operator.

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