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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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Frequently Asked Questions About the UniPro™ Valve Closure Systems
Question:
I've seen tank car valve closures that mount directly to the valve body. Why does the UniPro™ Standard Pneumatic Actuator mount to the tank car dome wall?
Answer:
There are several reasons. Mounting to the dome wall is a much quicker and easier operation than mounting to the valve body. By mounting them on the dome wall, the UniPro™ Standard Pneumatic Actuator and the low torque UniPro™ LT, can be removed from the valve handle, swung to the side to allow hand operation of the valve and reinstalled on the valve handle without the need for any re-adjustment. Another reason that the UniPro™ actuators mount to the dome wall is so they do not block access to any of the other components within the dome. Because the UniPro™ has no brackets or anti-rotational devices within the dome, access to sample valves, dip sticks, and pressure relief valves is not impeded. In the case of the reversible UniPro™ R, mounting to the dome wall can allow it to be used to open two adjacent valves without any re-adjustment in non-emergency situations. After it is used to open one valve, it is simply lifted off that valve handle, swung over to the adjacent one and dropped into place. There are no brackets to remove or re-adjust.
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UniPro Pneumatic Valve Closure Systems
