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| Body： |
GGG40 |
| Seat： |
EPDM/NBR/PTFE/VITON |
| Disc ： |
GGG40/ASTM A216 WCB/CF8/CF8M/ C954 |
| Top Flange： |
ISO 5211 |
| Size Range ： |
DN50-DN1200 |
| Working Temperature： |
Up to 120°C (Depending on the seat material) |
| Drilling Flange： |
PN10/PN16/CLASS125/CLASS 150/ JIS 5K/JIS 10K/BS TABLE D/BS TABLE E |
Concentric Butterfly Valve, Wafer, Worm gear operation?
The stem passes through the centerline of the disc which is in the center of the pipe bore and the seat is the inside diameter periphery of the valve body.
This zero-offset valve design is also called resilient-seated butterfly valve because it relies on the flexibility of the seat rubber to efficiently seal the flow when closed. In this type of valve, the disc first comes into contact with the seat at around 85° during a 90° rotation. Concentric butterfly valves are commonly used for low pressure ranges.
Wafer-style butterfly valve is the most economical version and it is sandwiched between two pipe flanges. The pipe flanges are connected through long bolts that cross the entire valve body and the sealing between the valve and pipe flanges.
This type of connection is designed for sealing against bi-directional differential pressures and to prevent backflow in systems designed for universal flow.
Top flange standard was designed according to ISO5211, the end user can install electric actuator or pneumatic actuator by their working conditions.
Concentric butterly valve designed two-way sealing pressure for preventing backflow in the system.
It is capable for handling fluids with solids in suspension as the valve disc moves into the valve seat with a wiping motion.
?
Concentric butterfly valve is used in water and wastewater treatment plants, fire protection systems, and gas supply.
