Nuances of Butterfly Valves: Extension Stem, Center Line, and Eccentric Designs

Jan 24, 2024 | News

Extension stem, center line, and eccentric butterfly valves represent distinct solutions for diverse industrial applications. Each design offers unique advantages and considerations. By understanding the characteristics, applications, and selection criteria of these butterfly valve types, engineers and technicians can optimize fluid control systems, ensuring efficient operation, reliable performance, and long-term durability.

Extension Stem Butterfly Valves: Extended Reach and Accessibility

extension stem butterfly valve

Extension stem butterfly valve feature a stem that extends beyond the valve body, allowing for remote operation in hard-to-reach or confined spaces. This design provides greater accessibility and convenience, making it ideal for applications such as:

• Remote valve actuation
• Overhead installations
• Underground installations
• Hazardous environments

Center Line Butterfly Valves: Compact and Streamlined

Center line butterfly valve, also known as in-line butterfly valves, are characterized by their compact design and streamlined flow path. The valve seat is positioned directly in the center of the valve body, ensuring minimal pressure drop and efficient flow control. Center line butterfly valves are commonly used in:

• HVAC systems
• Plumbing applications
• General industrial settings
• Water treatment plants

Eccentric Butterfly Valves: Enhanced Sealing and Durability

Eccentric butterfly valve incorporate an offset disc that rotates on an axis shifted from the valve’s center. This eccentricity creates a wiping action between the disc and seat, providing superior sealing capabilities and reduced wear and tear. Eccentric butterfly valves are well-suited for demanding applications, including:

• Pulp and paper industry
• Chemical processing
• Mining and mineral processing
• Power generation

Comparative Analysis: Choosing the Right Butterfly Valve

When selecting the appropriate butterfly valve for a specific application, several factors must be considered:

Accessibility and Reach: Extension stem butterfly valves offer extended reach for remote operation, while center line butterfly valves provide a compact design for confined spaces.

Flow Efficiency: Center line butterfly valves minimize pressure drop due to their streamlined flow path, making them ideal for applications requiring efficient flow control.

Sealing Performance: Eccentric butterfly valves excel in sealing applications due to their offset disc design, ensuring a tight seal even under high-pressure conditions.

Application Requirements: Consider factors such as pressure rating, temperature range, fluid compatibility, and actuation method to ensure the selected valve meets the specific application demands.