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Information on a Siebe control valve

I have several line in operation with a Barber Coleman linear actuator. I believe these are not functioning properly due to a pressure differential too great for the Siebe valve to fully close. I would like to know the pressure differential rating of a 2" Siebe brass valve, the only other #'s I could find are 257 (or 275) PSI rating. Does anyone know what these valves are rated for, or where I could go to get this info?
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