Specification

Big Size Ductile Iron Pn10 DN400~DN2400 Pneumatic Electric Actuator Double Offset Eccentric Flange Butterfly Valve

I. Product Overview

As a key flow regulation device in industrial pipeline systems, the Newway ductile iron double-offset flanged butterfly valve is specially designed for large-diameter pipelines. It adopts a double-offset structure and high-performance ductile iron, combined with electric/pneumatic actuators for precise control. With a diameter range of DN400-DN2400 (16″-96″) and pressure ratings of PN10-PN25, it stably manages water, sewage, air, gas, and other media within -20°C-120°C. Widely used in municipal water supply/drainage, wastewater treatment, power, and metallurgy, it complies with international standards such as ISO 5752, EN 593, and GB/T 12238.

II. Core Features: Perfect Integration of Double-Offset Technology and Ductile Iron

Eccentric Principle: The stem axis deviates from both the seat centerline and disc center, forming double offsets. This design allows the disc to disengage from the seat rapidly when opening, reducing seal surface friction by 70% compared to ordinary butterfly valves.

Sealing Performance: The 3D offset structure creates a line seal between the disc and seat. Paired with NBR/EPDM/PTFE elastic seals, it achieves ANSI FCI 70-2 Class VI (bubble-tight) sealing.

Torque Optimization: The double-offset design significantly reduces opening/closing torque. The electric actuation torque for DN1000 is ≤800N·m, reducing energy consumption by 30% compared to similar products.

High Strength: QT400-15 ductile iron features tensile strength ≥400MPa, elongation ≥15%, and impact toughness ≥14J/cm², suitable for high-pressure difference conditions.

Corrosion Resistance: The valve body uses epoxy coating (thickness ≥200μm), passing salt spray tests ≥1000 hours without rust, applicable to fresh water, seawater, and other media.

Lightweight Design: 20% lighter than cast steel valves, reducing support structure costs. The DN1200 model weighs ≤1.2 tons.

Actuator Configuration: Optional electric (AC220V/380V) or pneumatic (4-6bar) actuators. The electric actuator has IP68 protection and Ex d IIBT4 explosion-proof rating.

Control Modes: Supports on/off type and regulating type (4-20mA analog), with optional smart positioners for PID regulation and ±1% accuracy.

Remote Monitoring: Integrated with Modbus/TCP, Profibus, etc., enabling remote control and status feedback via SCADA systems.

III. Key Attributes: Technical Parameters and Standard Compliance