Double Eccentric Butterfly Valve

• Body and disc constructed of durable ductile iron, with epoxy powder coating for corrosion protection
• Precision welded stainless steel body seat that is microfinished for leak-free closure
• Elastomeric O-ring seal contained by epoxy powder coated steel retainer ring, enabling reliable compression
• Self-lubricating bronze bearings line the stainless steel shafts for wear resistance
• Exterior connections made of stainless steel material for resilience to pressures
• Manual actuation possible through sturdy cast iron handwheel with epoxy coating

• Double Offset Design: Representing the defining feature of these valves, the disc and seat do not touch when the valve is open, leading to reduced wear and tear.
• Variety of Applications: These valves find extensive use in water supply applications, often serving as substitutes to gate valves.
• High-Class Seal: Double eccentric butterfly valves are outfitted with a stainless steel dry shaft that is sealed off by rubber O-rings on a sealing sleeve and dry pins, thereby enhancing the valve’s ability to maintain a tight seal.
• Lower Operating Torque: Owing to the double eccentric design, these valves experience a release in seal compression after just a few degrees of opening, resulting in reduced operating torque.
• Flow-through Disc Design: This unique design facilitates the improvement of the overall fluid dynamics within the system.
• Durability and Ease of Operation: Designed to provide extended service life and easy operation, the innovative design of these valves minimizes friction during operation.

Double Eccentric Butterfly Valve Product Description

The double eccentric butterfly valve is a robust and efficient solution for industrial applications that require reliable performance and long service life. This advanced valve uses a unique dual-offset disc and shaft design to reduce friction, prevent wear, and maintain a tight seal. Built primarily from ductile iron, it is ideal for applications where high pressure and durability are essential.

Double Eccentric Design and Disc Seal

The double eccentric or double-offset structure positions the disc off-center from both the shaft and seat, reducing contact between the disc and seat when in operation. This design minimizes wear and allows for a more durable disc seal, ensuring a longer lifespan for the valve and improved efficiency in flow control.

Optimized Shaft and Dry Shaft Design

A key component of the double eccentric butterfly valve is its shaft design, which is engineered to handle high-stress operations while requiring lower operating torques. The dry shaft construction prevents medium from contaminating the shaft, enhancing the valve’s durability and stability over time. This reduction in operating torques leads to energy savings and ease of operation, even under high-pressure conditions.

Double Flange Configuration for Secure Installation

The double flange configuration enhances stability, making installation straightforward and secure. This feature is especially useful in settings where precise alignment and a secure fit are critical. Additionally, the double flange contributes to the valve’s impact resistance, making it a reliable choice for demanding environments.

Durable Material Composition for Industrial Use

Made primarily from ductile iron, the double eccentric butterfly valve offers impressive wear resistance, impact resistance, and longevity. Various grades of ductile iron can be selected based on specific application needs, with each grade offering distinct advantages in strength and flexibility. The shape of the graphite in the iron, along with specific heat treatments, enhances its mechanical properties, making it suitable for high-stress applications.

Comparison with Gray Cast Iron

While ductile iron is prized for its strength, gray cast iron provides additional benefits in terms of cost and ease of machining. The heat treatment process improves the resilience of both materials, ensuring stability under high pressure. This makes these materials ideal for valves used in environments with harsh operating conditions, where durability is critical.

Double Offset and Face-to-Face Standards

The double offset design minimizes wear by reducing disc-seat contact, which contributes to the valve’s extended service life. Standardized face-to-face dimensions ensure compatibility with various piping systems, including ductile iron pipes, facilitating easy installation and maintenance. This standardization is especially beneficial for users working with systems that require specific dimensional conformity across components.

Superior Wear Resistance and Extended Service Life

The double eccentric butterfly valve boasts exceptional wear resistance due to its high-quality construction and careful engineering. The low operating torques and precise shaft design ensure long-lasting performance with minimal maintenance needs, making it a dependable option for industries requiring frequent and consistent use.

Suitable for High-Demand Industrial Applications

This valve is an ideal choice for industries needing a durable, low-maintenance solution, such as water treatment, oil and gas, and chemical processing. Its impact resistance and wear resistance make it highly effective in high-pressure, high-flow applications, ensuring stable performance even in challenging environments. The double eccentric butterfly valve is engineered to meet stringent requirements, providing an efficient and reliable option for a variety of industrial uses.

To explore Jhy Group’s full range of valves, browse our product line or download our Company Brochures for detailed product information.