Key Parameters & Specifications Parameter / Feature Category Description Product Name Fisher™ RSS Reduced Section Control Valve Type Top-Entry, Sliding Stem, Post-Guided, Flangeless Body Globe Valve Primary Function Throttling (Modulating) Control for general-purpose process applications. Body Style Globe Body with a straight-through flow pattern. Size Range ½ inch to 6 inches (DN 15 to DN 150) Pressure Rating (ANSI) Class 150, 300, 600 End Connections Flangeless (Reduced Section). Requires separate companion flanges for installation between ANSI-rated pipeline flanges. Trim Post-Guided Plug. The plug is stabilized by a single guide post, providing adequate stability for general service. Leakage Class ANSI Class IV (standard metal seat). ANSI Class VI (bubble-tight shut-off) is available with a soft seat. Flow Characteristics Equal Percentage or Linear (determined by the contour of the plug). Temperature Range Standard: -20°F to 450°F (-29°C to 232°C). Extended ranges available with special materials. Actuator Compatibility Designed to be paired with Fisher pneumatic spring-and-diaphragm actuators (e.g., 585C series) and a positioner (e.g., a Fisher 480).