TOBO STEEL GROUP CHINA
TOBO STEEL GROUP CHINA
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16" PN16 Wafer Type Metal Seat Butterfly Valve ASTM A276 304
Body Test :1.5 times the working pressure with water. This test is performed after valve assembly and with disc in half position open, it is called as a body hydro test.
Seat Test :1.1 times the working pressure with water.
Function / Operation Test :At the time of final inspection, each valve and its actuator (Flow-Control Lever / Gear / Pneumatic Actuator), under goes a complete operating test (Open/Close). This test carried out without pressure and at ambient temperature. It ensures the correct operation of the valve / actuator assembly with accessories such as solenoid valve, limit switches, air filter regulator etc.
Special Test :On request, any other test can be carried out according to special instruction by client.
| Name | Material |
| Body | GJS500-7/ GJS400-15 |
| Disc | GJS500-7/ GJS400-15 |
| Shaft | SS420/SS431/Duplex 1.4462 |
| Body seal ring | SS304 |
| Disc seal ring | EPDM |
| Shaft bearing | Al-bronze |
| Retainer ring | Carbon steel +epoxy/ SS304 |
| O ring | EPDM |
| Pin | SS420 |
| Packing gland | Carbon steel +epoxy |
| End cover | Carbon steel +epoxy |
| Key | SS420 |
| Connection flange | Carbon steel +epoxy |
Overview:
1.Flange
Flange and drilling to EN1092-2, face to face as per ISO5752 series 14 & ISO5752 series 13.
2.Disc
Streamlined low profile disc ensures the lower flow resistance.
3. Body
Stainless steel welded and finished body seat ensures Reliable and durable performance.
4. Shaft
Disc to shaft connection by means of key, or taper pin.
5. Bearing
Self lubricating bearing of Al-bronze material, free from maintenance.
6. Gearbox
Low torque gearbox can be easily operated by hand wheel or connect with actuator.
7. Top flange
ISO 5211 top flange connect with gearbox or actuator.
8. O ring
Multiple shaft O rings provide long life and reliable sealing performance, which is easy to be adjusted or replaced.
9. Seal ring
T profiled disc seal ring fixed by retainer ensures the reliable sealing performance in both direction, which is also easy to be adjusted or replaced without any special tools
Butterfly valves are used for on-off or modulating services and are popular due to their light weight, small installation footprint, lower costs, quick operation and availability in very large sizes. These valves can be operated by handles, gears or automatic actuators.
| NO. | Part Name | Material | Optional Material | |
| 1 | Body | ASTM A351 CF8M | ASTM A216 WCB, CF8 | |
| 2 | Bearing | 304+PTFE | ||
| 3 | Disc Spacer | ASTM A276 316 | ASTM A276 304 | |
| 4 | Shaft | ASTM A564 17-4PH | ASTM A276 420 | |
| 5 | Seat | PTFE | RTFE | |
| 6 | Disc | ASTM A351 CF8M | ASTM A351 CF8 | |
| 7 | Pin | ASTM A564 17-4PH | ||
| 8 | Seat Retainer Plate | ASTM A351 CF8M | ASTM A216 WCB, CF8 | |
| 9 | Packing Washer | PTFE | ||
| 10 | Gland | ASTM A351 CF8M | ASTM A216 WCB, CF8 | |
| 11 | Key | Carbon Steel | ||
| 12 | Mounting Plate | ASTM A351 CF8M | ASTM A351 CF8 |
The butterfly valve was originally used where a tight closure was not absolutely necessary. However, over the years, these valves have been manufactured with fairly tight seals made of rubber or elastomeric materials that provide good shut off similar to other types of valves. Butterfly valves are used where space is limited. Unlike gate valves, butterfly valves can be used for throttling or regulating flow as well as in the full open and fully closed position. The pressure loss through a butterfly valve is small in comparison with the gate valve. The L/D ratio for this type of valve is approximately one-third of that of a gate valve. Butterfly valves are used in large and small sizes. They may be hand wheel–operated or operated using a wrench or gearing mechanism. A typical butterfly valve is shown in Figure 12.12.
