Double Offset Butterfly Valves

Specification

Ductile Iron/Cast Steel Electric Flanged Double Eccentric Soft Seal Butterfly ValveI.

1. Product Overview

As a critical shut-off device in industrial pipeline systems, the NWV electric flanged gate valve is constructed from ductile iron or cast steel, combined with rising stem (OS&Y) or non-rising stem structures, and achieves automated control via electric actuators. With a diameter range of DN50-DN1200 (2″-48″) and pressure ratings of PN10-PN40, it stably controls various media including water, steam, oil, and gas within -20°C-450°C. Widely used in water supply/drainage, power, chemical, and metallurgy sectors, it complies with international standards such as API 6D, ASME B16.34, and GB/T 12234.

II. Core Features: Structural Optimization and Material Upgrades

Sealing Principle: The elastic double-gate structure forms a line contact between the gate and seat, automatically compensating sealing specific pressure via medium pressure to achieve ANSI B16.104 Class VI sealing.

Self-Cleaning Function: During opening/closing, relative movement between the gate and seat scrapes deposits from sealing surfaces, suitable for particle-containing media.

Pressure Balancing: The gate features balancing holes to reduce operating torque. The electric actuation torque for DN600 is ≤800N·m, reducing energy consumption by 20% compared to similar products.

Body Materials: Ductile iron (QT450-10) with tensile strength ≥450MPa and elongation ≥10% suits normal-temperature low-pressure conditions; cast steel (WCB) with yield strength ≥250MPa applies to high-temperature/high-pressure systems.

Seal Surface Treatment: Seat sealing surfaces are overlay-welded with Stellite 6 alloy, hardness ≥HRC45, enhancing erosion resistance by 5 times.

Surface Protection: The body uses epoxy coating (thickness ≥250μm), passing salt spray tests ≥1,500 hours without rust, compliant with drinking water standards (WRAS certified).

Electric Actuator: Integrated smart electric actuator with IP68 protection and Ex d IIBT4 explosion-proof rating, supporting 4-20mA analog control.

Remote Monitoring: Integrated with Modbus/TCP and Profibus DP protocols for remote on/off control, position feedback, and fault diagnosis.

Manual Backup: Equipped with manual operation mechanism to ensure safety during power outages or failures.

III. Key Attributes: Technical Parameters and Standard Compliance