An EVA Motorised or electrically actuated UPVC true union ball valve with flanged ends is a type of valve used to control fluid flow in piping systems, particularly in applications where corrosion resistance and ease of maintenance are crucial. 

Here's a breakdown of its features and applications:

Key Features

• Motorised or Electric Actuator: This allows for automatic operation, either for on/off control or modulating (fine control) applications. The electric actuator allows for remote control and precise operation, enhancing system efficiency and reducing manual intervention.
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  • Control Types: Electric actuators can be controlled in various ways, including:
    • On/Off: Fully open or fully closed operation.
    • Modulating: Allowing for intermediate positions and precise flow control.
  • Power Supply: Available in various voltage options, such as 12V DC, 24V DC, and 220V AC.
  • Manual Override: Many actuators include a manual override mechanism (e.g., a key type or wheel type) for manual operation in case of power failure or emergency.
  • Enclosure: Electric actuators are available with weatherproof and flameproof enclosures, 

• True Union Design: This design facilitates easy installation, removal, and maintenance without cutting the pipeline, minimizing downtime. It consists of two halves connected by a union nut, allowing for convenient disassembly.
• Flanged Ends: Flanged ends provide a secure and leak-proof connection to other flanged components in the pipeline system, common in industrial settings and larger piping systems. These ends often adhere to standards like ANSI, DIN, or JIS.
• UPVC Material: Unplasticized polyvinyl chloride (UPVC) provides excellent corrosion and chemical resistance, making the valve suitable for a wide range of liquids and gases. Some manufacturers specifically mention using ASTM D1784 virgin UPVC resin.
• Durable and Reliable: These valves are designed for durability and a long service life, even in demanding environments. They are often 100% factory tested and designed for low operating torque.
• Available Sizes: These valves are available in a variety of sizes to suit diverse piping requirements, from small diameters (e.g., ½" or 20mm) to larger diameters (e.g., 4" or 110mm).
• Pressure Ratings: The valves are designed to withstand a range of operating pressures, including PN10 and PN16 versions
• Temperature Range: They have specific temperature ratings depending on the material. For example, PVC can handle temperatures up to 55°C, CPVC up to 95°C, and PP up to 120°C.
• O-Rings and Ball Seat: O-Rings may be made of food-grade EPDM or Viton®, while the ball seat can be made from HDPE or PTFE.
• Minimal Pressure Drop: They are designed to allow for maximum flow and minimum pressure drop or turbulence. 

Applications

These valves are widely used in a variety of applications due to their durability, corrosion resistance, and ease of maintenance. Some common applications include: 

• Water treatment and RO systems
• Chemical and pharmaceutical industries
• HVAC and building automation
• Irrigation and agriculture
• Food and beverage processing
• Industrial automation
• Swimming pools and aquaculture
• General fluid control
• Power generation plants
• Sewage and waste water treatment
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Advantages

• Corrosion Resistance: UPVC construction provides excellent resistance to chemicals and corrosion.
• Ease of Maintenance: The true union design simplifies maintenance and replacement procedures.
• Automated Control: Electric actuators enable remote and automated operation, enhancing efficiency and reducing manual labor.
• Cost-Effectiveness: UPVC valves are generally lighter in weight and more cost-effective compared to metallic valves.
• Leakage Reduction: Reliable sealing helps minimize leakage risks. 

In summary, electrically actuated UPVC true union ball valves offer a reliable, efficient, and cost-effective solution for automated fluid control in various applications requiring corrosion resistance and ease of maintenance.