The D341F46-16Q worm gear operated fluoroplastic-lined flanged butterfly valve is a specialized control valve designed for pipeline systems handling highly corrosive media. It is used for both shutoff and regulation duties in industrial process lines. The valve body is precision-cast from ductile iron, a material offering excellent strength, toughness, and impact resistance, ensuring stable load-bearing capacity under medium to low pressure conditions. The internal cavity, disc surface, and all wetted sealing areas are integrally lined with F46 fluoroplastic (FEP – Fluorinated Ethylene Propylene). This lining material provides outstanding chemical stability, low surface energy, and high resistance to media permeation, enabling effective protection against strong acids, alkalis, organic solvents, and various aggressive fluids.

The valve employs a concentric butterfly design in which the disc rotates around the stem axis to regulate the flow area. The opening process is smooth, and flow resistance changes progressively, supporting stable flow control. The fluoroplastic lining completely isolates the process medium from the metallic body, significantly reducing corrosion, electrochemical reactions, and scaling risks while extending overall service life. The resilient sealing configuration forms effective contact pressure under pipeline pressure, ensuring dependable sealing performance within the rated pressure range.

Flanged ends are manufactured with RF (Raised Face) sealing surfaces, providing rigid and evenly distributed bolted connections compatible with standard piping systems. The design tolerates minor pipeline misalignment, contributing to reliable installation.

The valve is equipped with a worm gear operator, suitable for medium to large diameters. The transmission system offers a high reduction ratio and self-locking capability, enabling smooth operation and precise positioning, which helps maintain the required valve opening during service. The enclosed gearbox structure provides protection against dust and moisture in field environments.

This lined butterfly valve is extensively used in chemical processing units, acid and alkali transfer systems, environmental engineering facilities, dosing systems in water treatment plants, flue gas desulfurization systems in power plants, and other corrosive service pipelines. It combines corrosion resistance with structural integrity and operational stability, making it a widely adopted isolation and control device for aggressive chemical media.