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The 253B-4-100-2 Exhaust Throttle Valve regulates the removal of gas from a processing system. It features a 3.875 inch (98 mm) nominal inside diameter and a size NW100 ISO-MF Flange. Its flapper is positioned to modulate gas flow, thereby controlling process pressure. The 253 has a patented non-linear actuator placed between the flapper shaft and the motor drive shaft in order to generate a linear valve transfer characteristic and provide smooth linear pressure control. The Type 253 is available in standard sizes and flange styles, and is compatible with all MKS throttle valve controllers.