Specification

DN500 Pneumatic Motorized Double Eccentric butterfly Valve Pn16 High-Performance Double-Offset Butterfly Valve

I. Product Overview

As a core device for precise flow regulation and reliable shut-off in industrial pipeline systems, the Newway high-performance double-offset butterfly valve features an innovative double-offset structure, constructed from high-performance materials such as ductile iron, cast steel, and stainless steel, paired with electric, pneumatic, or manual drive systems for versatile complex applications. With a diameter range of DN50-DN1200 (2″-48″) and pressure ratings of PN10-PN40 (Class 150-600LB), it stably controls media like water, steam, oil, gas, and acid-base solutions within -40°C-400°C, complying with international standards such as API 609, EN 593, and GB/T 12238. It serves as an ideal choice for petrochemical, power energy, municipal water supply/drainage, and metallurgical mining sectors.

II. Core Features: Double-Offset Technology and Full-condition Adaptability

Eccentric Principle: The stem axis deviates from both the seat centerline and disc plane (radial offset 2-3mm, angular offset 5°), enabling the disc to disengage from the seat rapidly when opening, reducing seal surface friction by 60% compared to ordinary butterfly valves and significantly extending service life.

Bidirectional Sealing: Combining metal hard seal (Stellite overlay welding) with elastic soft seal (EPDM/NBR/PTFE) achieves bidirectional bubble-tight sealing (API 598 standard leakage ≤0.01×DN mm³/s) without distinguishing media flow direction.

Torque Optimization: The double-offset design reduces opening/closing torque by 40%, with pneumatic actuation torque for DN300 ≤120N·m, suitable for low-power drive systems and delivering significant energy savings.

Ductile Iron (QT450-10): Tensile strength ≥450MPa, elongation ≥10%, suitable for normal-temperature low-pressure conditions (e.g., municipal water supply/drainage), with epoxy coating thickness ≥200μm passing salt spray tests ≥1000 hours.

Cast Steel (WCB): Yield strength ≥250MPa, resistant to 425°C high-temperature steam, applicable to high-temperature/high-pressure scenarios in thermal power plants and refineries.

Stainless Steel (304/316): Containing 18% chromium and 8% nickel (316 with 2% molybdenum), offering 8x higher chloride corrosion resistance than carbon steel, suitable for seawater and chemical media.

Actuator Configuration: Electric actuators support 4-20mA analog regulation, with IP68 protection and explosion-proof type complying with Ex d IIBT4 standards; pneumatic actuators respond within ≤0.8 seconds with spring return function.

Remote Monitoring: Integrated with communication protocols like Modbus/TCP and Profibus DP, enabling real-time position feedback, fault diagnosis, and remote control via SCADA systems.

Manual Backup: Equipped with worm gear manual mechanism, allowing easy switching to manual operation during power outages or failures to ensure system safety.

III. Key Attributes: Technical Parameters and Standard Compliance