High Performance
Over 100,000 service life,
more suitable for frequent
opening/closing conditions.
Low Torque
Capatible with small actuators,
all components are interchangeable,
and reduced support cost.
Flexible Seal
Eliminates the negative effects
of abrasion, deformation,
temperature change, preussre
change, etc. to achieve reliable seal.
Fireproof Design
Teflon fireproof sealing design.
Product Summary
Our independently designed and developed high performance double eccentric butterfly valve uses memory pressure-energized sealing ring to eliminates the negative effects of abrasion, deformation, temperature change, preussre change, etc. to achieve reliable seal.
Suitable for Marine, Marine, hydraulic system oil, natural gas, chemical, electric power and other industries. This valve is compact in construction, light in weight and reliable in sealing. Compared with the traditional gate valve, it is easy to install, reliable sealing, easy to maintain and long service life.
Offset 1
The axis of the shaft is behind
the centerline of the sealing
point of the disc to seat.
Offset 2
The axis of the shaft is eccentric to the center of the
valve/pipe line. The design of two offsets are used
to reduce the friction between seat and disc while
opening/closing the valve.
Sealing structure
- The unique structure of two-piece seat design consists of PTFE seat with pressure-energized sealing rings. This simple and reliable design has many unique advantages.
- Flexible O-ring can be compressed and create fully contact with the seat resulting zero clearance.
- The grooves with toothed design on the valve body and gland effectively ensure that the T-shaped seat is well fixed at the right position at anytime.
- Gland is bolted to the body to fix the gland at the right position even without mating flange.
- When in high pressure condition, the reliably fixed and supported seat can increase the sealing performance by utilizing the pressure between disc and medium. While in low pressure or vaccum conditons, the seat can provide superior sealing performance by its own memory characteristics.
- Has a performance of bi-directional sealing with zero leakage.
- The memory characteristics of seat can adjust itself according to wear and temperature to maintain a stable sealing performance.
- Easy seat change process without any influence on disc, seat or stem: remove the dampen rotate the disc to close position, change the seat in the body.
High performance butterfly valve structure
1. Valve body
- Disc positioner is installed to prevent possible damage to disc and seat during opening/closing of the valve.
- Valve seat fixed design.
- Valve body uses carbon steel or stainless steel suitable for sour service. Extended bonnet design with 500mm insulation space makes it convenient to change packing material and install actuator.
- Top standardized design.
- When designing and testing the valve we take consideration of no deformation under persistent or transient pressure and temperature changes as priority.
- The thickness of valve body varies greatly at each part therefore thus, how to increase valve's strength and stiffness but avoid stress concentrarion at the mean time has been considered as priority when designing the valve. Meanwhile, the conventional thickness is also increased after taking the minimum thickness and the shape of the shell into consideration.
- Locating notch design
- Valve material standard classification
Carbon Steel/Stainless Steel/Duplex/Titanium Alloys/Nickel Alloys/Aluminum and Aluminum Alloys/Copper and Copper Alloys/Alloy Steel
2. Seat
- The unique structure of two-piece seat design consists of PTFE seat with pressure-energized O-ring. Seat is fixed at the groove of the body with a retaining ring. The O-ring is isolated compeletely to avoid touch with the medium.
- The toothed design on the valve body and retaining ring effectively locate the seat fixed at designated position. The retaining rings are fixed on valve body using bolts, so the seat can be fixed reliably even in conditions without mating flange. The seat is fixed and supported well to produce better sealing performance with the pressure from the disc and medium. When the pipe pressure increases, the sealling performance of the valve also increases simotiniously, while under low pressure or vacuum conditions, seat can still seal completely with the support of the O-ring to create DBB effect.
- Valve seat can adjust according to self wear and temperature to maintain its sealing performance.
- Quick and convenient seat change. Simply remove the retaining ring, turn the disc to the close position, and replace the new seat into the body groove. Simple and fast without causing any damage to the disc and shaft. Since PTFE‘s coefficient of friction is 0.08, so the torque require to open/dose the valve is small.
3. Disc
- Double-eccentric disc design
- Disc and seat not touching each other during open/close of the valve to reduce seat wear.
- No wear points on the upper or lower part of the seat to reduce the operating torque.
- Easy repair or maintain the seat, simply remove the gland to replace the seat and no need to disassemble the disc and shaft.
- Excellent performance on cutting and controling the medium.
Flow characteristic curve changes proportionally with wide adjustment range.
Effectively seal the medium while controlling it at the same time.
- Seat is protected from deformation while the disc is open to reduce operating torque.
- Streamlined design allows maximum flow, minimum fliud resistance and high Cv value.
- The disc structure is complicated, how to inscrease the strength and stiffness of the valve but avoid stress concentrarion at the meantime is the primary consideration when designing the valve. The thickness of the disc is smaller than 2.25 times of the shaft diameter. Superior smooth disc surface with a roughness of Ra W 6.3pm allows the disc to work under pressure difference of 2 times without being deformated and damaged.
- When designing and testing the valve we take consideration of no deformation under persistent or transient pressure and temperature changes as priority.
4. Shaft
- Disc positioner is installed to prevent possible damage to the disc and seat during opening/closing of the valve.
- Seat positioning and fixed structure design.
- Valve body uses carbon steel or stainless steel suitable for sour service. Extended bonnet design with 500mm insulation space makes it convenient to change packing material and install actuator.
- Top standardized design.
- When designing and testing the valve we take consideration of no deformation under persistent or transient pressure and temperature changes as priority.
- The thickness of valve body varies greatly at each part therefore thus, how to increase valve's strength and stiffness but avoid stress concentrarion at the mean time has been considered as priority when designing the valve. Meanwhile, the conventional thickness is also increased after taking the minimum thickness and the shape of the shell into consideration.
- Locating notch design
- Valve material standard classification
Carbon Steel/Stainless Steel/Duplex/Titanium Alloys/Nickel Alloys/Aluminum and Aluminum Alloys/Copper and Copper Alloys/Alloy Steel
5. Shaft and disc connection
- Precision fitted connection ping builds a stable connection between high strength and unique designed shaft and disc.
- The cylindrical beveled edge designed ping protects the ping from sheared while being squeezed, and increase the strength of stem. The pin is solid in position and easy to change.
6. Firesafe design
- Both metal and non-metal seat material contact with the disc. During and after the fire, the metal seat still stably contact with the disc to create reliable bi-directional seal.
- Qualified by fire testing as specified in API 607 Edition 4
Consult
021-68016659