Wafer Type Double Eccentric Design Butterfly Valves
SUN’s Wafer Type Double Eccentric Design Butterfly Valves are a specific type of butterfly valve used to control the flow of fluids in pipelines. The “double eccentric” design is a critical feature of these valves, offering improved performance, especially in high-pressure applications or those requiring precise control of flow.
Water Treatment:
Commonly used in potable water and wastewater pipelines.
HVAC:
For air flow control and fluid regulation in heating and cooling systems.
Chemical Processing:
For handling corrosive and aggressive chemicals.
Mining and Industrial Applications:
Often found in systems handling slurries or abrasive fluids.
Compact Design:
The wafer-type design reduces the weight and space required for installation, making it ideal for constrained spaces.
Ease of Installation:
These valves can be quickly and easily bolted between flanges, requiring fewer bolts than other valve types.
Cost-Effective:
Wafer-type valves generally have a lower cost due to their design, making them a budget-friendly solution.
Maintenance:
The split-body design makes the valve easier to maintain, with simplified access to internal components.
Versatility:
They are used in a variety of industries, from water treatment to HVAC systems.
| Specification | Details |
|---|---|
| Size Range | 2″ (50mm) to 48″ (1200mm) |
| Pressure Rating | PN10, PN16, PN25, PN40, ANSI 150 |
| Body Material | Cast Iron, Ductile Iron, Stainless Steel |
| Disc Material | Stainless Steel, Cast Iron |
| Seat Material | EPDM, NBR, Viton, PTFE |
| Temperature Range | -10°C to 120°C (14°F to 248°F) |
| Leakage Rate | ISO 5208 Class A/B |
| End Connection | Wafer Type |
| Operation | Manual, Pneumatic, Electric |
| Face-to-Face Dimensions | API 609 / EN 558 |
| Standards | ISO 9001, CE, API 609 |
Note: These are general guidelines and may be tailored depending on specific project requirements.
Double Eccentric Design:
The term “double eccentric” refers to two offsets in the valve’s geometry, which help reduce friction and wear during operation.
The first eccentricity is the offset between the center of the valve stem and the center of the valve disc.
The second eccentricity is the offset between the center of the valve disc and the valve body. These design features allow the disc to lift off the sealing surface as it starts to rotate, minimizing seat wear and torque requirements.
Wafer Type:
The wafer-type butterfly valve is a compact and lightweight design, where the valve is sandwiched between two flanges in a piping system.
The wafer design is less bulky compared to lug-type valves and is generally used for low-pressure and medium-pressure applications.
Flow Control:
Butterfly valves regulate fluid flow by rotating a disc (or valve plate) within the valve body. The position of the disc controls the amount of fluid passing through the valve.
Double eccentricity reduces the friction between the disc and the seat, ensuring a smoother operation, longer valve life, and better sealing when close