Zero leakage Triple Offset Butterfly Valve
Triple Offset Design
1st Offset: It is accomplished by moving the centerline of the shaft away from the seat surface.
2nd Offset: It is accomplished by moving the centerline of the shaft offset from the centerline bore of the valve.
3rd Offset: It is accomplished by adjusting the cone angle created by the 1st and 2nd offset angles at some point downstream of the valve in the center of the piping to the adjacent piping wall.
By incorporating the 3 offsets into one design eliminates any risk of friction and jamming of the disc on the seat. This increases valve lifetime, the driving torque is very low, in comparison with other types of valves (gate valves, ball valves, ...).
Blow-Out Proof Stem
The stem is a split ring to protect the stem from blowout.
Whether the valve with or without pressure，release the packing bolts, stem will not blowout.
Fire Safe Design
The fire test is conducted according to API 607 Section 5.
V Type Gland Flange
It can prevent packing shift under pressure.
Packing Design
Packing is online adjustment.
Wedge shaped packing, the sealing will be more reliable.
Double Belleville Spring Design
Belleville spring loaded can always protect packing sealing.
Seat Design
Laminated seat design is Uni-directional or Bi-directional.
The seat is retained by the seat retainer, which prevents the seat from blowing out during operation.
Pin Design
With a pin to eliminate gap between disc and stem, so that the disc will be not moved after pressure.
Locking device
Lever operation with locking device. To avoid to misuse.
Gear operation with the locking device is also available upon request.
Others
Short pattern length, low cost and light weight.
Easy for installation.
