Triple Offset Butterfly Valve

Applicable Standards

Butterfly valve design according to API609, ASME B16.34
Face to face ASME B16.10/API609
End Flanges ASME B16.5/ASME B16.47
Butt Welding ends ASME B16.25
Inspection and test API 598

Material: LCB
Size Range: 2- 56″
Pressure Rating: ASME CL 150,300
Temperature Range: -29°C~425°C

Design Description

- Low friction between seat and disc of valve
- “Zero Leakage” Sealing Design
- Standard Laminated Resilient Disc Seal to 800°F (427°C)
- One Piece Shaft
- Low torque enables the compact actuator and a  long cycle life
- Blow-out proof shaft
- Optional stem extension
- Optional locking device

Application & Function

GW Triple Offset Flange Butterfly valve is used to prevent galling and scratches between the metal seat and the metal disc due to its unique design. The only time where the seal comes into contact with the seat is at the point of complete closure. Triple offset valves are generally used in applications which require bi-directional tight shut-off in oil and gas, LNG/NPG terminal and tanks, chemical factories, and shipbuilding. They are also used for dirty/heavy oil to prevent extrusion.

Accessories

Accessories such as gear operators, actuators, locking devices, chain wheels, extended stems and bonnets for cryogenic service and many others are available to meet the customer’s requirements.