The Series 31U Resilient Seated Butterfly Valves represent premium flow control solutions engineered for industrial applications that demand dependable performance and extended service life. These valves feature a robust lug-style body construction that provides secure mounting between pipeline flanges, making them particularly suitable for systems requiring section isolation without complete pipeline disassembly. Available in sizes ranging from 2 to 20 inches (50mm to 500mm), they accommodate various pipe diameters commonly found in industrial settings. The valves operate effectively across a temperature spectrum from -18°C to 100°C, ensuring reliable performance in both chilled and heated media applications. Their carefully engineered design focuses on delivering bubble-tight bidirectional shut-off capabilities up to 285 psi (20 Bar), preventing leakage even under high-pressure conditions that would challenge ordinary valves.

These butterfly valves serve critical functions across multiple industries where fluid control precision and operational reliability are essential requirements. In water and wastewater treatment facilities, they control flow in filtration systems, pump stations, and distribution networks with consistent performance. Chemical processing plants utilize them for handling various aggressive media thanks to their corrosion-resistant material options including stainless steel components and nickel aluminum bronze construction. HVAC systems in large commercial and industrial buildings employ these valves for chilled and hot water circulation control, while fire protection systems rely on their dependable operation for life safety applications. Manufacturing plants implement them in process water, cooling systems, and compressed air lines where uninterrupted operation is crucial for maintaining production continuity and operational efficiency.

The business value of Series 31U valves lies in their exceptional reliability and reduced total cost of ownership through minimal maintenance requirements and extended service intervals. Their bubble-tight sealing capability eliminates product loss and prevents environmental contamination, addressing both operational efficiency and regulatory compliance concerns effectively. The valves' quarter-turn operation enables rapid response during emergency shutdown situations, potentially preventing costly damage to equipment and infrastructure while ensuring workplace safety. The availability of multiple material configurations allows businesses to select options that match exact application requirements, ensuring optimal performance in specific operating conditions. This flexibility combined with proven durability makes these valves a strategic investment for organizations prioritizing operational reliability and long-term value in their fluid handling systems.

Key Features:
- Lug body design for secure mounting between flanges with size range 2-20 inches
- Operating temperature range from -18°C to 100°C for versatile application suitability
- Bidirectional bubble-tight shut-off capability up to 285 psi pressure rating
- Multiple body material options including ductile iron, carbon steel, and nickel aluminum bronze
- Corrosion-resistant disc and stem materials including stainless steel and Monel K500

Benefits:
- Reduced maintenance costs through durable construction and reliable performance
- Enhanced operational safety with bubble-tight sealing preventing leaks and contamination
- Quick quarter-turn operation for rapid response during emergency situations
- Versatile application across multiple industries and temperature conditions
- Long service life with corrosion-resistant materials reducing replacement frequency