Powell Fabrication & Manufacturing, Inc.

Remote Shutdown System

Frequently Asked Questions

Compressed Gas Valves

Various Cylinder, Ton Container, and Railcar Valves compatible with both Electric and Pneumatic actuators.  More...


UL-CUL Approved

Powell Valve Closure System control panels (UniPro family, MaxPro™ RA & E-Pro®) are listed by Underwriters Laboratory to UL 508A for Enclosed Industrial Control Panels. Panels are listed by Underwriters Laboratory bearing the UL & CUL mark for use in the United States and Canada markets. In applications where a CSA listed control panel in Canada is required, please contact Powell for further information.

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Railcar Gas Remote Shutdown: 

My control room is quite a distance from the railcar platform. Would I be able to activate the UniPro™ system from there?


In the event of an emergency, the UniPro™ System will automatically respond to any alarm input, closing valves with 120 lb-ft of torque in less than 10 seconds. The UniPro™ Control Panel automatically activates the actuator to close the valve in the event of a gas leak, car movement, fire alarm, seismic event, security breach, process shutdown, or other monitored condition. You can also manually activate the system by depressing the emergency stop button on the panel.

Emergency Stop ButtonDue to the possible presence of stray electrical interference, the UniPro™ electrical system controls should never be more than 130 ft. (40 m) away from each other. Powell offers Emergency Stop Push Button Panels that can be mounted remotely. They should always be mounted within 130 ft (40 m) from the control panel to avoid electrical interference that could affect the operation of the system. Likewise, the UniPro™ Control Panel should always be within 130 ft (40 m) of the UniPro™ Air Control Unit. The same rule holds for gas sensors and other safeties that must send an electrical signal to the UniPro™ Control Panel.

UniPro Installed

UniPro™ installed on Railcar.

Emergency Stop Button

UniPro™ Remote Emergency Pushbutton Panel installed on the staircase leading to the railcar platform.

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