PRODUCTS
PRODUCTS
BUTTERFLY VALVE
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BUTTERFLY VALVE
TRIPLE ECCENTRIC METAL SEAT BUTTERFLY VALVE
Structural features – Triple Eccentric
First eccentricity
 The center of the disc is off from the center of the shaft
Second eccentricity
 The shaft center is off from the center of the valve body.
Third eccentricity
 The disc contact surface is inclined in a “cone shape” rather than a circle → When opening and closing, the seat and disc do not rub but touch and fall in a “cam-like” manner.
As a result
 No friction between disc and seat → minimal wear
Resistant to high temperature/pressure operating conditions
Lower torque + improved seat life
Product Information
Metal Seat Features
Can be used in high temperature, high pressure, and high wear environments
Use of heat-resistant/wear-resistant alloys such as Stellite, SS316, Inconel, and Hastelloy
Not a flexible seat → Perfect bubble-tight sealing may be difficult, → but Class IV~VI level leakage prevention is possible through precision processing and design
Pros
Suitable for use in high temperature, high pressure, and highly corrosive environments (boilers, steam, oil, gas, etc.)
Long life and low operating torque due to no disc/seat friction
Bubble-tight sealing possible (when precision machining)
Long maintenance cycle → Suitable for industrial plants
Mainly used fields
Power plant (steam line)
Petrochemical plant
Oil/Gas/High Temperature Piping Systems
LNG, high temperature and high pressure control valves, etc.
Key Features
Item
Explanation
SEAT structure
Metal-to-Metal
Temperature range
~ 600°C or higher is also possible (depending on material)
RATING
JIS B 2210 ( 5K, 10K, 16K, 20K, 30K),
ASME B 16.5 & 16.47 ( CLASS 150, 300, 600, 900 ), EN 1092-1 ( PN06, PN10, PN16, PN25, PN40 ), AWWA C 207 etc
How it works
90 degree rotation (gear, electric, pneumatic, manual, etc.)
Corrosion resistance/wear resistance
Very good (material choice available)
Leakage rating
In general ANSI Class IV~VI
Actuator
Manual types such as gears, and automatic types such as electric, pneumatic, and hydraulic actuators
Comparative Summary
Item
Rubber Seat
PTFE Seat
(Double
Eccentric)
Metal Seat
(Triple
Eccentric)
friction
Present
Less
Almost none
Sealability
Very good
(Bubble tight)
Good
Good
(Class IV~VI)
Chemical resistance
Average~Good
Very good
Varies depending on material
Heat resistance
Low
(80~110°C)
Average
(200°C)
Very good
(~600°C or higher)
Pressure resistance
Average
Above average
Very good
Cost
Cheap
Medium
High