DD373H Stainless steel triple ss 316 eccentric wafer type butterfly
valve
1. Size: 2"to26"wafer type, lug type and double flanged type
2. Materials: Body: Cast iron, carbon steel, 304S. S, 316S. S and
aluminum bronze. Disc: Ni-plated ductile iron, Nylon coated ductile
iron, 304S. S, 316S. S, aluminum bronze and monel. Shaft: 416S.
Sand316S. S, 17-4pH. Seat: EPDM, high temperature EPDM, food grade
EPDM, NBR, abrasive resistant NBR, Viton, high temperature Viton,
Hypalon, Silicon rubber PTFE over EPDM, PTFE over NBR, Neoprene.
Bushing: Glass backed PTFE
3. Working Pressure: 2"to6" 40bar 8"to26" 25bar
| 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 |
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.
Dimensions data(mm)
| DN | A | B | ASME CLASS 150 | ASME CLASS 300 | ΦD | H | Φd | ΦE | 4-ΦG |
| C |
| 2.5" | 155 | 70 | 48 | 48 | 120 | 32 | 16 | 70 | 10 |
| 3" | 175 | 76 | 48 | 48 | 130 | 32 | 16 | 70 | 10 |
| 4" | 176 | 92 | 54 | 54 | 160 | 32 | 19 | 70 | 10 |
| 6" | 225 | 125 | 57 | 59 | 215 | 32 | 20 | 70 | 10 |
| 8" | 267 | 150 | 64 | 73 | 273 | 45 | 26 | 102 | 12 |
| 10" | 276 | 175 | 71 | 83 | 325 | 45 | 32 | 125 | 13 |
| 12" | 320 | 240 | 81 | 92 | 375 | 45 | 36 | 125 | 13 |
15 Butterfly Valve
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.
