DOUBLE ECCENTRIC BUTTERFLY VALVE
With EN1074-1 & EN1074-2 type approval certification, For use with drinking water, WRAS approved
PRESSURE RATING: PN10, PN16, PN25, PN40
SIZE RANGE: DN200 ~ DN4000
SEAT MATERIAL: EPDM/NBR/VITON/SILICONE/METAL
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 sealing performance in double direction. The seal ring could be adjusted or replaced easily on site. Don’t need special tools.
External locking device 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.
Operated with gearbox + handwheel and with ISO 5210 top flange to be coupled with an electric actuator, if required at a later date.
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.
Part No | Description | Material | Part No | Description | Material |
1 | Gear housing | Ductile iron,GJS400-15 | 10 | Retainer ring | Stainless steel, 1.4571 |
2 | Key | Stainless steel, 420 | 11 | Disc seal ring | Rubber, EPDM |
3 | Upper shaft | Duplex SS, 1.4462 | 12 | Screw | Stainless steel,A2-70 |
4 | Packing gland | Ductile iron,GJS400-15 | 13 | Taper pin | Stainless steel, 420 |
5 | O ring | Rubber, EPDM | 14 | Valve disc | Ductile iron,GJS400-15 |
6 | Bolt | Stainless steel,A2-70 | 15 | Lower shaft | Duplex SS, 1.4462 |
7 | Shaft bearing | Bronze, QAl9-2 | 16 | Shaft bearing | Bronze, QAl9-2 |
8 | Valve body | Ductile iron,GJS400-15 | 17 | O ring | Rubber, EPDM |
9 | Body seat | Stainless steel, 316 | 18 | Shaft cover | Ductile iron,GJS400-15 |
Coating: fusion bonded epoxy coating, min. thickness 300 micron
Suitable medium: potable 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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