Extreme Temperature Range
Uniform thickness body, suitable for extreme high/low temperature service range from -196°C to 815°C.
Intelligent Manufacturing
Flexible automatic production line High precision machining process, interchangeable valve parts
Superior Sealing Performance
New innovative patent applied to produce metal to metal bi-drecitonal sealing butterfly valves with the highest sealing performance.
Low operating cost
Extreme low wear during disc opening and dosing process increases product life and reduces maintenance cost.
Product Summary
Triple-eccentric butterfly valve adds another unique angle offset on the double-eccentirc butterfly valve to allow the disc to seal against the seat with no friction during the 90 degree‘s opening and closing process. It provides a more cost-effective solution to services require high temperature, high pressure or low temperature. Triple-eccentric butterfly valve is widely used in the pipline system of metallurgy industry, power industry, petrochemical industry, water and sewer system, and municipal construction requires strict medium control.
Offset 1
The shaft is offset behind the seat axis to allow completesealing around the entire seat
Offset 2
The shaft centerline is offset from the pipe and valve which provides interference free opening and closing of the valve
Offset 3
The seat cone axis is offset from the shaft centerline to eliminate friction during closing and opening and to achieve uniform compressive sealing around the entire seat
Structural features of triple-eccentric butterfly valve
1. Sealed body and disc
- Body and seat are adopted with fission structure
- Replaceable seat and sealing ring are interchangeable, they can be quickly replaced in case of the sealing surface is damaged to improve customer‘s running efficiency as well as reducing the cost.
- Valve opening/dosing torque can be reduced efficiently by adjusting the torque on gland screw.
- When torque is applied to the stem, the O-ring on the disc is being radially compressed to achieve full contact with the seat to create a "cone in cone" structure which allows the valve to be operated with minimal torque.
2. Horizontal pins for torque delivery
- The lug type and wafer type butterfly valve bodies and yokes are casted together to create a solid connection between them. Two horizontal pins are inserted between the double-flange designed yoke flange and body flange to avoid vibration and provide more torque during operation.
3. Double safety protection structure
- A thrust ring is installed on both upper side and bottom side of the disc individually to keep the disc centered. This design also protects the valve disc from the deformation caused by the pressure and temperature of the medium, and it also avoids situations like stem misalignment and disc stuck closed.
- An additional design of structure is applied inside the valve to prevent the stem from damaged and blown out in case of accident.
4. Streamline designed disc
- Our streamline disc is designed through the stress calculation and fluid simulation analysis, which is proved to be effective in reducing flow resistance, pressure drop and increasing the CV value. The stem is also designed to be hidden in the disc to avoid erosion caused by sour medium.
5. Connected disc and stem
- The connection between stem and disc is a beveled cylindrical pin, which has a self-locking angle and is tightened with a set of screws to prevent shaft from loosening. This design improves the strength of the stem as well.
- Theoretically speaking, with the beveled cylindrical pin connection design, the stem reaches fracture point before the pin.
- The pin is hidden inside the disc to avoid the erosion from medium. In general, pins inside the valve are not required to be spot welded, so there is no intergranular corrosion between the stem and pins.
6. Stem seal design
- Gland packing: lip-seal is used as a part of packing material, which expands under pretension to create close contact between stem and packing material to create better sealing performance than regular packing material. This special packing design also reduce the fugtive emissions to be lower than 100PPM.
- Disc spring is used to compress the packing material continuously and consistently, which keeps the sealing force consistent in case of packing material loss. This design also keeps packing material effective for a long-term use.
7. Zero leak bi-directional sealing
- Two adjustable isolation rings are installed in the packing material to provide additional sealing effect, leak dection and purging.
- All valves are tested according to API598 and API6D test standards with zero leakage, and also tested according to the TA-LU FT Point 3.1.8.4 standard to meet all requirements of level SIL3.
Consult
021-68016659