Double Eccentric Butterfly Valve
Product description
Valve design to EN 593, EN1074-1/2, BS5155, DIN3354
Flange to EN 1092, BS4504, DIN2501, ISO7005, ASME B16.5, ASME B16.1, AWWA C207, AS4087
Face to face length to EN 558-1 / ISO 5752 series 14 / series 13, or other special length
♦ Stainless steel weld and finished body seat ensures a corrosion and wear resistant seat face.
♦ Streamlined low profiled disc design verified by finite element analysis ensures the higher strength and the lower flow resistance
♦ By means of seal gasket designed at joint between shaft bearing and disc, double O ring on shaft bearing and closed disc eyes, they form a dry operating condition for shaft and shaft seal to avoid the corrosion from service medium.
♦ Anti-blow out shaft design.
♦ Disc to shaft connection by means of taper pin or key(optional).
♦ Self-lubricating bearing in bronze or stainless steel lined PTFE reduce shaft friction and operating torque, the bearings keep the disc in center and prevent axial movements;
♦ Multiple O rings in shaft sealing system could prevent outleakage and dirt into. The O rings on packing gland and shaft cover could be replaced easily without removing the valve from pipeline.
♦ Suitable for full vacuum service conditions.
♦ T profiled resilient seal ring is secured on the disc by a retainer ring and bolts, and ensures reliable bi-directional sealing performance. The seal ring could be adjusted or replaced easily on site. Don’t need special tools.
♦ External locking device(Shaft lock/limit block) will be provided on the non-drive shaft ends, to enable the gear to be removed with the valve remaining in service in the open or closed position.
♦ Disc locking pin design is available as client’s request.
♦ Operated with gearbox + handwheel and with ISO 5210 top flange to be coupled with an electric actuator, if required at a later date.
♦ Gearbox with high mechanical advantage and low torque to adapt to various brands of electric actuator, such as Auma, Rotork & Bernard etc.
♦ Extension spindle from valve shaft or gearbox spindle are available as request.
♦ Valve externally and internally fusion bonded epoxy coated with a thickness of 250micron (different coating/lining is available as special request) and color code RAL5005/5015/5017.
♦ Suitable for the applications involving throttling service and for applications requiring valve actuation after long periods of inactivity.
Double Eccentric Butterfly Valve
Materials of component
|
No |
NAME |
MATERIAL* |
SPECIFICATION |
REMARKS |
|
1 |
Gear housing |
Ductile Iron |
GJS450-10 |
|
|
2 |
Key |
Stainless Steel |
1.4021(SS420), 1.4057(SS431),17-4PH(SS630) |
|
|
Duplex Stainless Steel |
1.4462(S31803),1.4507(S32750) |
for rubber lined butterfly valve |
||
|
3 |
Upper Shaft |
Stainless Steel |
1.4021(SS420), 1.4057(SS431),17-4PH(SS630) |
|
|
Duplex Stainless Steel |
1.4462(S31803), 1.4507(S32750) |
for rubber lined butterfly valve |
||
|
4 |
Packing Gland |
Ductile Iron |
GJS500-7(GGG50), GJS400-15(GGG40) 65-45-12, 60-40-18 |
|
|
Carbon Steel |
1.0038(S235JR) |
|||
|
5 |
0 ring |
Rubber |
EPDM, NBR |
|
|
6 |
Bolt |
Stainless Steel |
A2-70(SS304), A4-70(SS316) |
|
|
Duplex Stainless Steel |
S31803, S32750 |
for rubber lined butterfly valve |
||
|
7 |
Shaft Bearing |
Bronze |
QAI9-2 CC331G |
|
|
8 |
Valve Body |
Ductile Iron |
GJS500-7(GGG50), GJS400-15(GGG40) 65-45-12, 60-40-18 |
|
|
Carbon steel |
1.0619(WCB) |
|||
|
9 |
Body Seat |
Stainless Steel |
Cr-Ni alloy / Ni welded |
|
|
10 |
Retainer Ring |
Carbon Steel |
1.0038(S235JR) |
|
|
Stainless Steel |
1.4301(SS304), 1.4401(SS316),1.4571(SS316Ti) |
|||
|
11 |
Disc Seal Ring |
Rubber |
EPDM, NBR, FKM, Silastic |
|
|
12 |
Screw |
Stainless Steel |
A2-70(SS304), A4-70(SS316) |
|
|
Duplex Stainless Steel |
S31803, S32750 |
for rubber lined butterfly valve |
||
|
13 |
Pin |
Stainless Steel |
1.4021(SS420) |
|
|
Duplex Stainless Steel |
1.4462(S31803),1.4507(S32750) |
for rubber lined butterfly valve |
||
|
14 |
Valve Disc |
Ductile Iron |
GJS500-7(GGG50), GJS400-15(GGG40) 65-45-12, 60-40-18 |
|
|
Carbon steel |
1.0619(WCB) |
|||
|
15 |
Lower Shaft |
Stainless Steel |
1.4021(SS420), 1.4057(SS431),17-4PH(SS630) |
|
|
Duplex Stainless Steel |
1.4462(S31803), 1.4507(S32750) |
for rubber lined butterfly valve |
||
|
16 |
Shaft Bearing |
Bronze |
QAI9-2 CC331G |
|
|
17 |
0 ring |
Rubber |
EPDM, NBR |
|
|
18 |
End Cover |
Ductile Iron |
GJS500-7(GGG50), GJS400-15(GGG40) 65-45-12, 60-40-18 |
(Other materials are available on request.)
★ Coating: fusion bonded epoxy coating, min. thickness 300 micron
★ Suitable medium: potable water, drinking water, sea water, TSE water, low-corrosive liquid etc.
★ Suitable temperature: 0 ~ 80 ℃
★ Pressure test to EN12266-1: Leakage rate: Class A (Zero leakage) in both direction
★ 100% testing before delivery
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