Technical Parameters General Product Line: Fisher Whisper Noise and Cavitation Control Trims Model: Whisper NXV Trim Type: Multi-stage, cage-style, labyrinth path trim. Valve Body Compatibility: Fisher easy-e globe valve bodies (e.g., ET, EWT, ES models). Design & Performance Noise Reduction: Capable of achieving noise reductions of up to 50 dBA or more compared to a single-stage orifice, making it one of the most effective trim designs available. Cavitation Control: Eliminates cavitation damage by managing the pressure drop across multiple stages, ensuring the internal pressure at each stage remains above the fluid's vapor pressure. Pressure Staging: Utilizes dozens of individual turns and chambers to create a high number of pressure stages, dissipating energy in a controlled manner. Flow Characteristic: Inherent flow characteristic is modified linear, designed to provide stable control over the entire travel range. Pressure & Temperature Pressure Class: Available for valve bodies rated ANSI Class 150 through 2500. Temperature Rating: Suitable for the full temperature range of the compatible easy-e body, typically from -29°C to 593°C (-20°F to 1100°F), depending on body and trim materials. Sizing & Capacity Valve Size Range: Typically available for valve sizes 1 inch through 12 inches (DN 25 through DN 300). Flow Capacity (Cv): The Cv value for an NXV trim is specific to its part number and is generally lower than a single-stage trim of the same size due to the restrictive flow path. Exact Cv values are determined using Fisher sizing software. Liquid Pressure Recovery (FL): The NXV design results in a high FL factor, making it highly resistant to cavitation. Materials Trim Materials: Standard materials include 17-4PH stainless steel and 316 stainless steel. Other hardened and corrosion-resistant alloys like Alloy 20, 410 SS, 440C SS, and Stellite are available for more severe services. Cage & Component Materials: Constructed to match the process requirements and provide long-term durability under high-energy flashing or cavitating conditions. Applications High-Pressure Drop Services: Pressure reduction, let-down applications. Liquid Services: Pump minimum flow (recirculation), feedwater control, water injection, where cavitation is a primary concern. Gas & Steam Services: High-pressure steam let-down, compressor anti-surge, gas pressure reduction, where noise is the primary concern.

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