ZJHF pneumatic fluorine-lined bellows sealed control valve is a precision execution unit specifically engineered for highly corrosive media and toxic or volatile fluids. It integrates a multi-spring pneumatic diaphragm actuator with a single-seated valve body lined with fluoroplastics (FEP/F46 or PFA), featuring an innovative double-sealing structure combining bellows and packing. By receiving standard 4-20mA DC signals from control systems, the actuator converts air pressure into linear displacement to drive the stem for precise regulation in aggressive environments. With all wetted parts covered by high-performance fluorine plastics and the bellows seal ensuring zero stem leakage, this valve is widely utilized in petrochemical, fine chemical, pharmaceutical, and acid-alkali production where safety and anti-corrosion requirements are paramount.

Product Image of ZJHF Pneumatic Fluorine-lined Bellows Sealed Control Valve

Features

1. Superior corrosion resistance:All internal surfaces in contact with the medium, including the body cavity, plug, and seat, are fully lined with fluoroplastics (e.g., F46/PFA). This material offers exceptional chemical inertness against almost all strong acids, alkalis, and oxidants.
2.Zero-leakage double sealing:The stem seal utilizes high-performance bellows as the primary seal, creating an absolute airtight barrier to eliminate leakage. Secondary packing seal is provided as a fallback to ensure system safety even if the bellows fails.
3.Precision pneumatic actuator:Equipped with a compact multi-spring pneumatic diaphragm actuator, providing low height, light weight, and high output force. Paired with a smart positioner, it achieves excellent linearity and repeatability.
4.Intrinsically safe attributes:Driven by compressed air without electrical signals in hazardous zones, providing natural explosion-proof safety. Available in air-to-open or air-to-close modes for fail-safe positioning upon air supply loss.
5.Optimized low-flow resistance path:The internal flow path is smooth and streamlined, significantly reducing pressure drop. The single-seat sealing design combined with precision-ground surfaces ensures bubble-tight shut-off.
6.Excellent vacuum resistance:Advanced compression molding ensures the lining is tightly bonded to the metal substrate, effectively preventing lining peeling or collapse under vacuum or negative pressure conditions.
7.Broad temperature and pressure adaptability:Suitable for aggressive conditions from -20°C to 150°C. The thermal expansion coefficient of the lining is optimized for dimensional stability under temperature fluctuations.
8.Modular maintenance design:The compact structure features a scientific connection between actuator and body. Key internals like the lined plug and seal kits are modular for easy replacement, reducing downtime and maintenance costs.