ZECO Valve is engaged in manufacturing and supplying a wide range of Wafer Type Butterfly Valves.
What is a Wafer Type Butterfly Valve?
Wafer Type Butterfly valve construction is formed with the centered disc rotating inside the valve body 90 degrees. With the actuation type, the flow of the fluid can be stopped, regulated or started. In a wafer connection, the valve is installed between the pipe flanges and tightened to its place with the bolts for the pipe flanges.
Technical Standard of Wafer Type Butterfly Valves
| General Design and Manufacturer | BS 5155 / API 609 / EN 593 / IS 13095 |
| Valve Face to Face Dimension | BS 5155 / ISO 5752 / API 609 |
| Top Flange Drilling | ISO 5211 |
| Valve Inspection and Testing | BS 6755 Part – I / API 598 / EN 12266-1 |
| Flange Standard Conformity | ANSI 150 / ANSI 125 / BS 10 TAB D & E |
| Size Range | DN 40 TO DN 1600 |
| Pressure Rating | PN 10 (DN 650 TO DN 1200) / PN 10 & PN 16 & PN25 (DN 40 TO DN 600) |
| Operating Temperature Range | -25°C to 200°C (Depending on MOC) |
| Operation | Hand Leaver/ Worm Gear Operation- Optional Electrical / Pneumatic actuator operation – Optional |
Seat Temperature Range of Wafer Type Butterfly Valves
| SEAT TYPE | TEMPERATURE RANGE | |
| Min. | Max. | |
| NITRILE | -13°F (-25°C) | 212°F (100°C) |
| EPDM | -13°F (-25°C) | 250°F (120°C) |
| SILICON | -58°F (-50°C) | 356°F (180°C) |
| VITON | -23°F (-5°C) | 392°F (200°C) |
| HYPALON | -23°F (-5°C) | 392°F (200°C) |
Advantages of Wafer Type Butterfly Valves
- Wafer, Lug or U type flanged body style fit between FF or RF flanges
- PTFE bushing ensure the maximum shaft support and centralized alignment
- 360° polished disc assures positive on-off
- Hard-Backed Cartridge Seat
- One piece shaft, pinned, splined and square connected disc
- Universal ISO 5211 mounting Pad
Wafer Type Butterfly Valve Installation
The valves are bi-directional and can be fitted in either direction relative to the ow. The valve will control flow equally in either direction. The recommended installation position is shaft horizontal and the lower disc edge opening downstream (especially for slurry service and media with a tendency for sedimentation). For optimum valve control and smooth performance, it should have 10 to 20 pipe diameters of straight run inlet piping and 3 to 5 pipe diameters straight outlet piping.
Do not use the valve as a crow-bar to spread the flanges, this might lead to damage to the flange area and/or damage to the O-ring sealing.
