A gear-operated UPVC butterfly valve is a flow-control device that uses a gearbox to manually or automatically operate a rotatable disc. The Unplasticized Polyvinyl Chloride (UPVC) construction makes the valve resistant to corrosion, chemicals, and rust. 

This type of valve is typically used in industrial and commercial applications for water treatment, chemical processing, and irrigation systems. 

Components and function

• UPVC Body: The valve's body and disc are typically made from UPVC, providing excellent resistance to corrosive materials.
• Disc: The disc is a circular plate within the valve that is rotated to regulate the flow of fluids.
• Gearbox: The gearbox, usually a worm gear, connects to the valve stem. It provides a mechanical advantage, increasing torque and allowing for easier operation of larger valves with high fluid pressure.
• Handwheel: A handwheel is used to turn the worm gear, which then rotates the valve stem and disc to open or close the valve.
• Seals: EPDM or VITON seals prevent leaks and are chosen based on the specific fluid and operating temperature. 

Key features and benefits

• Corrosion resistance: UPVC valves are highly resistant to chemical corrosion, making them suitable for a wide range of fluid applications.
• Durability and reliability: The robust construction and use of corrosion-resistant materials result in a longer service life and low maintenance requirements.
• Accurate flow control: The gearbox provides fine-tuned control, allowing for precise regulation of the fluid flow rate.
• Ease of operation: The mechanical advantage of the gear system significantly reduces the force required to operate the valve, especially in larger sizes.
• Cost-effectiveness: Compared to many metal valves, UPVC butterfly valves are often more economical.
• Lightweight: The material's low weight makes installation easier, particularly in large-diameter applications. 

Common applications

• Water treatment plants
• Industrial process lines
• Irrigation systems
• HVAC systems
• Swimming pool applications