Key Parameters & Specifications Parameter / Feature Category Description Product Name Fisher™ DST-G Digital Sliding Gate™ Control Valve Assembly Type Integral Assembly of a rotary-shaft control valve body, Sliding Gate trim, and a digital valve positioner. Primary Function High-performance throttling control with integrated digital diagnostics and configuration. Trim Technology Sliding Gate™ Trim: A non-rotating stem moves a ported disc across a fixed seat. This design minimizes friction and wear. Actuator & Positioner Actuator: Spring-and-diaphragm or piston actuator. Positioner: Typically integrated with a Fisher FIELDVUE® (e.g., DVC6000 or DVC2000) Digital Valve Controller as a standard feature. Communication & Protocol HART®, FOUNDATION™ Fieldbus, or Profibus PA (depending on the DVC version ordered). Flow Characteristics Equal Percentage is standard. Linear characteristic is available. Valve Body Styles Fisher Vee-Ball® (most common for DST-G), Fisher easy-e® Control Valve, or Fisher GX Control Valve. Size Range (Vee-Ball) Typically 1 to 12 inches (DN 25 to DN 300). Pressure Rating (ANSI) Class 150 through Class 600. Leakage Class ANSI Class IV (standard metal-seated). ANSI Class VI (soft-seated) is available for bubble-tight shut-off. Temperature Range Standard: -50°F to 450°F (-46°C to 232°C). Extended temperature ranges are available with special components. Key Features • High Capacity: High Cv for a given valve size. • Low Fugitive Emissions: Packing system designed for low emissions. • Smart Diagnostics: Built-in diagnostics via the FIELDVUE positioner (e.g., travel, pressure, step-response tests). • Stable Control: Non-rotating guide design provides exceptional stability, reducing deadband and hysteresis.

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