Product Introduction
The Wafer Type Double Eccentric High Performance Butterfly Valve is designed for demanding industrial applications requiring tight sealing, high pressure resistance, and long service life.
Its double offset design minimizes seat wear by allowing the disc to disengage from the seat immediately after a few degrees of opening, greatly reducing friction and torque while extending the seat life.
This high-performance valve is suitable for a wide range of fluids — including water, steam, air, oil, and chemical media — and is widely used in power plants, petrochemical facilities, water treatment, and industrial pipelines where both pressure and reliability are critical.
Product Features & Advantages
Double Eccentric Design: The shaft center is offset from both the valve and pipe centerlines, reducing friction and ensuring smooth, low-torque operation.
Excellent Sealing Performance: Metal or soft sealing options ensure zero leakage under Class 150/300 conditions.
Longer Service Life: Reduced wear between disc and seat during opening/closing, ideal for frequent operation.
High Temperature and Pressure Resistance: Suitable for working conditions up to Class 300 and temperatures up to 250°C (482°F).
Compact Wafer Type Body: Saves installation space and simplifies maintenance.
Versatile Seat Options: Soft seat (PTFE, RPTFE, VITON) and metal seat (Stellite overlay, SS, Duplex) available.
Actuation Flexibility: Can be operated by lever, worm gear, pneumatic, or electric actuator.
Technical Comparison: Double Eccentric vs. Centerline Butterfly Valve
Feature Double Eccentric Type Centerline Type
Sealing Mechanism Disc moves off seat early to reduce wear Disc stays in contact with seat through rotation
Torque & Friction Low torque, low friction Higher torque, higher wear
Pressure & Temperature Range Higher (Class 300, up to 250°C) Lower (Class 150, up to 120°C)
Seal Type Metal or soft seal Only soft seal
Service Life Longer Moderate
Typical Use Industrial high-performance systems General water systems
Technical Parameters
| Parameter | Specification |
| Size Range | NPS 2″ – 40″ / DN50 – DN1000 |
| Pressure Rating | NPS 2″ – 24″: Class 150 / Class 300 NPS 28″ – 40″: Class 150 only |
| Temperature Range | -29°C – +250°C / -20°F – +482°F |
| Body Material | WCB, CF8, CF8M, Duplex Stainless Steel, … |
| Disc Material | CF8, CF8M, Duplex Stainless Steel, Aluminum Bronze, … |
| Seat Material | PTFE, RPTFE, VITON, Metal (Stellite, SS) |
| Stem Material | Stainless Steel (AISI 410 / 420 / 431) |
| Connection Type | Wafer type, suitable for EN 1092-2 / ASME B16.5 / JIS 10K flanges |
| Sealing Type | Soft or Metal Seal, Bi-directional or Uni-directional |
| Operation | Lever, Gearbox, Pneumatic actuator, Electric actuator |
Applications
Power generation and energy systems
Petrochemical and chemical processing
Water treatment and desalination
HVAC and industrial gas pipelines
Steam and high-pressure liquid systems
Tianjin Dingliu valve Industry Co., Ltd. is a high-tech enterprise specializing in the valve and automation industry.
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