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Explosion Isolation Valves are designed to be installed on bag houses dirty side ductwork to prevent the damaging effect of a dust collector explosion from returning to a building. In most cases, these valves are part of a larger solution including a Control Panel, Micro Switch and ATEX Dust Level Sensor for NFPA 69-2014 compliance.OperationIn normal operation the damper blade, or flap, is floating and therefore held opened by continuous air flow. When the air flow is stopped, or reversed, the blade falls under the influence of its own weight and the valve is in the closed position. If during the running process, an explosion occurs behind the valve, the air flow is immediately reversed by the increase in pressure and the pressure wave will close the damper blade and isolate the filter unit from the rest of the installation to ensure that the explosion doesn’t propagate upstream.Most certification compliant installations include not only the explosion valve but additional components including, but not limited to a control panel, micro switch and ATEX dust sensor.
The control panel functions to receive a signal from the valve when it is activated (closed) and then signal any other systems that an event has occurred – for example to activate a fire suppression system in the collector.
The micro switch is mounted on the explosion isolation valve and sends a signal to the control panel when the valve is closed.
The dust sensor serves to sense if unwanted amounts of particulate have built up within the valve that could interfere with the operation (movement) of the internal flap.
You will need to consult your system specifications and consult with authorities having local jurisdiction to determine which components are required for your application.
For more information, please contact US Tubing or visit our Explosion Isolation Valve product page.