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Note:The tables above are the Maximum Pressure/Temperature Ratings for the metallic components only. When checking pressure/temperature ratings, check the tem- perature rating and chemical compatibility of the packing material and, if applicable, the resilient seat material. In a majority of knife gate valve designs, the temperature limit or the chemical compatibility of the seat and/or packing material determines the practical pressure/temperature limitations.
* “R” Series valves have external, non-wetted, carbon steel components. Standard “R” Series valves are limited to 700°F (371°C); however alternate “R” Series constructions are available to 1000°F (538°C)