High-Performance Double Offset Butterfly Valve

Qisheng High-Performance Double Offset Butterfly Valve

Welcome to reliable and efficient flow control. The Qisheng Double Offset Butterfly Valve (also known as a high-performance butterfly valve) is engineered to deliver exceptional durability and bubble-tight shut-off in demanding industrial environments. Designed with a dual-eccentric shaft, this valve minimizes mechanical wear and maximizes operational efficiency. Whether you are managing water distribution, chemical processing, or HVAC systems, our double offset design offers a perfect balance of high performance, safety, and cost-effectiveness.

The Double Offset Advantage

• Significantly Reduced Friction: The double eccentric design ensures the disc lifts off the seat after just a few degrees of rotation during opening, drastically reducing friction and wear.
• Extended Seat Life: By minimizing contact between the disc and the sealing ring, the operational lifespan of the valve seat is vastly extended, lowering maintenance costs.
• Lower Operating Torque: The cam-like action of the double offset geometry allows the valve to operate smoothly with less energy, making it ideal for efficient automation and smaller actuators.
• Reliable Bubble-Tight Seal: Designed to provide a secure, leak-free shut-off, maintaining system integrity under varying pressure conditions.

Core Engineering Features

• High-Performance Sealing Options: Available with soft seats (such as PTFE or RTFE) for zero-leakage standard applications, or fire-safe seating (a combination of soft and metal backup rings) for hazardous environments.
• Dynamic Sealing Mechanism: The seat is designed to utilize line pressure to enhance the sealing force, ensuring tight shut-off regardless of flow direction.
• Intrinsically Safe Design: Features an integrated anti-blowout stem structure that completely conforms to API 609 safety standards, protecting personnel and infrastructure.
• Heavy-Duty Construction: Manufactured with a rugged, one-piece cast body and a high-strength shaft to handle rigorous pipeline stresses.
• Easy Maintenance: The retainer ring design allows for quick and easy replacement of the seat without requiring total disassembly of the valve mechanism.

Typical Applications

Thanks to its versatile sealing options and robust structural design, the Qisheng Double Offset Butterfly Valve is highly suitable for a wide variety of industries, including:

• Water & Wastewater Treatment: Large-scale municipal water distribution, pump stations, and desalination plants requiring reliable isolation.
• Chemical & Petrochemical: Safe handling of chemical fluids, mild corrosives, and general process applications.
• HVAC & General Utility: Commercial cooling towers, chilled water systems, and facility heating infrastructure.
• Power Generation & Pulp/Paper: Low-pressure steam, condensate systems, and general slurry flow control.

Technical & Operating Specifications

Our valves are strictly manufactured and tested in accordance with top global standards to ensure seamless integration into your existing pipeline infrastructure.

• Design & Manufacturing Standards: API 609, ASME B16.34
• Testing & Inspection Standard: API 598 / ISO 5208
• Face-to-Face Dimensions: Conforms to ASME B16.10 and API 609 (Available in Wafer, Lug, and Flanged configurations)
• Pressure Ratings: ASME Class 150 and Class 300
• Size Range: NPS 2″ to NPS 48″ (DN50 to DN1200)
• Temperature Range:
  • Soft Seat (PTFE/RTFE): -29°C to 200°C (-20°F to 392°F)
  • Fire-Safe / Metal Backup: Up to 350°C (662°F)
• End Connections: Compatible with ASME B16.5 and ASME B16.47 Series A/B
• Actuation Mounting: Standardized Yoke mounting flange diameter according to ISO 5211, compatible with manual gear, pneumatic, or electric actuators.

Comprehensive Material Configurations

To accommodate diverse media and environmental conditions, the Qisheng Double Offset Butterfly Valve is available in premium Carbon Steel and Stainless Steel configurations. Below is the standard material breakdown: