The Series 31H resilient seated butterfly valves represent engineering excellence in industrial flow control technology, designed for professionals who demand reliability and consistent performance. These valves feature a robust lug-style body construction available in sizes from 2 to 20 inches (50mm to 500mm), making them suitable for diverse piping systems across multiple sectors. Engineered to operate effectively in temperature ranges from -20°F to 250°F (-29°C to 121°C), they maintain structural integrity across extreme environmental conditions. The bidirectional bubble-tight shut-off capability ensures zero leakage at pressures up to 250 psi (17.2 Bar), providing operational security in critical applications where system failure is not an option. With multiple material configurations including cast iron, ductile iron, and stainless steel components, these valves offer exceptional durability and extended service life.

These industrial butterfly valves serve essential functions across multiple sectors where precise flow control and operational reliability are paramount. In HVAC systems, they regulate heating and cooling media in large commercial and institutional buildings, ensuring efficient temperature management. Water treatment facilities utilize them extensively for handling potable water distribution, wastewater processing, and chemical treatment applications. Manufacturing plants depend on these valves for managing process fluids, including aggressive chemicals, slurries, and high-pressure industrial media. The fire protection industry values them for critical safety systems requiring immediate shut-off capabilities, while power generation facilities employ them in cooling water circuits and process flow control applications. Their versatility makes them suitable for virtually any industry requiring dependable fluid management solutions.

The operational value of Series 31H valves lies in their exceptional reliability and reduced total cost of ownership over their service life. These valves minimize maintenance requirements and operational downtime through superior engineering and high-quality material selection. The bubble-tight shut-off capability prevents product loss and potential environmental contamination, while the robust construction ensures years of trouble-free operation under demanding conditions. The lug-style design facilitates straightforward installation and maintenance procedures, significantly reducing labor costs and system downtime during servicing. Users benefit from proven performance that meets international standards, ensuring compatibility with existing infrastructure while supporting future expansion projects without compatibility concerns.

Key Features:
- Lug-style body design for secure installation and maintenance accessibility
- Operating temperature range from -20°F to 250°F (-29°C to 121°C)
- Bidirectional bubble-tight shut-off at 250 psi (17.2 Bar) pressure rating
- Multiple material options including cast iron, ductile iron, and stainless steel
- Comprehensive size range from 2 to 20 inches (50mm to 500mm)

Benefits:
- Reduced maintenance requirements and operational downtime
- Prevention of product loss and environmental contamination
- Extended service life through robust construction and quality materials
- Easy installation and maintenance reducing labor costs
- Compatibility with existing infrastructure and future expansion