Specification

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

I. Product Overview

Newway electric flanged double eccentric soft seal butterfly valve is a high-performance industrial valve engineered with a double eccentric structure, designed for efficient flow control in diverse medium and normal temperature environments. Constructed with ductile iron or cast steel bodies and soft rubber seals, this valve combines compact design, reliable sealing, and electric actuation to meet the demands of water supply and drainage, industrial processing, and fluid transmission systems. Its 90-degree rotational operation ensures quick shutoff and precise regulation, while the double eccentric design enhances sealing stability—critical for applications where leakage prevention and long service life are paramount. Whether integrated into water plants, power stations, steel mills, or chemical facilities, this valve delivers consistent performance, adapting seamlessly to media such as water, air, gas, oil, and weakly corrosive fluids.

II. Key Attributes and Specification Parameters

1. Basic Attributes

Structure: Double eccentric design, where the valve shaft and butterfly plate are offset by two distinct eccentricities. This structure minimizes friction between the sealing surfaces during operation, enabling “tighter sealing as it closes” and reducing wear on the soft seal.

Body Material: Available in ductile iron (QT450-10) and cast steel (WCB), with optional cast iron (HT200, HT250) for cost-sensitive applications. Ductile iron offers excellent toughness and impact resistance, while cast steel provides higher strength for medium-pressure systems.

Sealing Material: Soft rubber seals, including nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), silicone rubber, fluororubber (FKM), and PTFE. These materials are selected for their elasticity, chemical resistance, and compatibility with different media.

Pressure Rating: 1.0MPa and 1.6MPa, suitable for medium-pressure industrial pipelines and water supply systems.

Port Size: DN50 to DN2000 (equivalent to 2in to 80in), covering small to extra-large pipeline diameters to accommodate diverse flow requirements.

Temperature Range: Dependent on sealing material:

Nitrile rubber: -40℃ to 90℃ (ideal for oil and water-based media)

Fluororubber: -20℃ to 200℃ (suitable for higher-temperature fluids and weakly corrosive media)

Media Compatibility: Versatile for water (industrial, municipal), air, natural gas, mineral oil, and weakly corrosive fluids (e.g., dilute chemicals), ensuring adaptability across industries.

Connection Form: Flanged ends, conforming to GB/T 9113 and GB/T 17241.6 standards, facilitating secure integration into existing pipeline systems.

Driving Mode: Electric actuation, featuring a motorized mechanism that enables remote or automated control of the 90-degree butterfly plate rotation. This ensures precise operation and reduces manual effort, ideal for large-diameter valves or automated systems.

Warranty: Backed by a 1-year warranty, ensuring reliability and providing assurance for long-term industrial use.

2. Detailed Specification Parameters

Design and Manufacturing Standard: GB/T 12238

Flange Connection Standard: GB/T 9113, GB/T 17241.6

Structure Length Standard: GB/T 12221

Testing and Inspection Standard: GB/T 13927

Valve Shaft Material: 2Cr13 (stainless steel, offering corrosion resistance and structural strength)

Packing Material: Flexible graphite, ensuring stem sealing to prevent external leakage.

Pressure Testing Parameters:

Sealing test: 0.66MPa (for 1.0MPa rating), 1.1MPa (for 1.0MPa rating), 1.76MPa (for 1.6MPa rating)

Strength test: 0.9MPa (for 1.0MPa rating), 1.5MPa (for 1.0MPa rating), 2.4MPa (for 1.6MPa rating)

Leakage Rate: Complies with GB/T 13927, ensuring minimal to zero leakage under rated conditions.