Triple Offset Butterfly Valves

Body:  WCB, CF8,CF8M
Disc:  CF8,CF8M,CF3M
Seat:  UNS31803(duplex)+graphite
Connection:  Wafer,Flange
Size:  2″-80″
Pressure:  Class150,Class300
Flange standard: ASME B16.5 Class150,Class300; EN1092 PN16, PN25, PN40






    Description

    A Comprehensive Guide to Triple Offset Butterfly Valves

    Triple Offset Butterfly Valve are industrially significant, offering a reliable and zero-leakage mechanism. In this guide, we will cover:

    1. The technical specifications of the valve
    2. The advantages of using this type of valve
    3. The applications in which they are best suited
    4. Comparisons to other valve types
    5. Important maintenance and repair procedures
    6. Common issues that may arise with Triple Offset Butterfly Valves

    Technical Specifications

    Double offset butterfly valve are engineered to provide zero leakage through a no-rubbing 90-degree rotation mechanism across a wide range of pressure and temperature conditions. Some key technical specifications include:

    • Connection: Double flange
    • Size Range: 3″-80″ for PN10,PN16,Class150; 3″-48″ for PN25,PN40,Class300; 3″-24″ for Class600
    • Pressure Range: PN10,PN16,PN25,PN40,Class150,Class300,Class600
    • Flange Standard: ASME B16.5 Class150,Class300,Class600; EN1092 PN16,PN25,PN40
    • Face to Face: ISO 5752, ASME B16.10, API609 Double flanged short pattern
    • Pressure Test: API 598, ISO 5208 Rate A, ANSI B16.104(ANSI/FCI 70-2)Class Ⅵ
    • Temperature Range: -29°C to +538°C
    • Operator Options: Lever, Gearbox, Pneumatic actuator, Electric actuator

    Advantages of Triple Offset Butterfly Valves

    The primary advantages of triple offset butterfly  include:

    1. Zero Leakage: The valve is designed to achieve zero leakage, making it highly suitable for applications demanding tight shutoff.
    2. Versatility: These valves can handle high-temperature and high-pressure applications, making them useful across a wide range of industries.
    3. Lower Torque Requirements: The triple offset design reduces the torque requirement for opening and closing the valve, making it more energy-efficient.
    4. Longevity: Due to the no-rubbing action during rotation, the valve components experience less wear, increasing the overall lifespan of the valve.

    Applications of Triple Offset Butterfly Valves

    Triple Offset Butterfly Valves are used in various industries such as:

    • Oil & Gas
    • Chemical & Coal
    • Petrochemical
    • Desalination Plants
    • Waterworks
    • Fossil Fuel Applications
    • District Heating

    Comparisons to Other Valve Types

    Triple offset valve  excel compared to other valve types in several ways:

    1. Superior to Globe Valves: Due to their compact design and lower cost, Triple Offset Butterfly Valves are a more economical choice when compared to Globe Valves.
    2. Low Maintenance vs. Ball Valves: Triple Offset Butterfly Valves have fewer moving parts, making them easier to maintain and repair compared to Ball Valves.
    Connection Double flange
    Size 3″-80″ for PN10,PN16,Class150; 3″-48″ for PN25,PN40,Class300; 3″-24″ for Class600
    Pressure PN10,PN16,PN25,PN40,Class150,Class300,Class600
    Flange standard ASME B16.5 Class150,Class300,Class600; EN1092 PN16,PN25,PN40
    Face to face ISO 5752, ASME B16.10, API609 Double flanged short pattern
    Pressure test API 598, ISO 5208 Rate A, ANSI B16.104(ANSI/FCI 70-2)Class Ⅵ
    Temperature -29°C to +538°C
    Operator Lever,Gear box,Pneumatic actuator,Electric actuator

    Triple Offset Butterfly Valves

    No. Part name Material
    1 Body WCB CF8M
    2a Disc WCB,CF8 CF8M
    2b Disc sealing UNS31803(duplex)+graphite
    2c Disc sealing retainer SS304 SS316
    2d Disc sealing retainer screw SS304 SS316
    3 Seat welded surface Stellite Gr.21
    4 Shaft 17-4 PHSS,1.4462
    5 Packing gland CF8
    6 Bottom cover Same as body
    7 Cover seal Graphite
    8 Thrust washer SS316
    9 Bracket WCB CF8M
    10 Retaining ring SS304
    11 Packing RPTFE, Graphite
    12 Packing ring SS316
    13 Bearing SS316+PTFE
    14 Thrust bearing SS316
    15 Key SS316
    16 Bolt SS304
    17 Bolt SS304
    18 Bolt SS304
    19 Nut SS304

    Triple Offset Butterfly Valves

    Triple Offset Butterfly Valves

    SIZE A B C D E Top Flange L WT(kg)
    Class150 PN10 PN16 PN25
    DN INCH Class150,PN10,PN16,PN25
    80 3″ 260 125 17.5 190 200 200 200 14 F07 114 30
    100 4″ 290 141 17.5 230 220 220 235 14 F07 127 40
    125 5″ 310 150 17.5 255 250 250 270 14 F07 140 45
    150 6″ 330 165 18.5 280 285 285 300 17 F10 140 50
    200 8″ 385 214 24.5 345 340 340 360 22 F10 152 85
    250 10″ 425 243 24.5 405 395 405 425 22 F10 165 120
    300 12″ 490 286 30 485 445 460 485 27 F12 178 160
    350 14″ 525 312 30 535 505 520 555 27 F12 190 195
    400 16″ 545 350 39 595 565 580 620 36 F14 216 255
    450 18″ 580 383 49 635 615 640 670 46 F16 222 310
    500 20″ 640 407 49 700 670 715 730 46 F16 229 390
    600 24″ 690 484 60 815 780 840 845 55 F25 267 565
    700 28″ 720 525 130 925 895 910 960 80 F30 292
    750 30″ 750 550 130 985 80 F30 318
    800 32″ 760 600 130 1060 1015 1025 1085 98 F30 318
    900 36″ 795 660 150 1170 1115 1125 1185 120 F35 330
    1000 40″ 815 720 180 1290 1230 1255 1320 130 F35 410
    1050 42″ 850 750 180 1345 150 F35 410
    1200 48″ 995 825 200 1510 1455 1485 180 F40 470
    SIZE A B C D E Top Flange L WT(kg)
    Class300 PN40
    DN INCH Class300,PN40
    80 3″ 260 100 17.5 210 200 14 F07 180 30
    100 4″ 290 124 17.5 255 235 14 F07 190 40
    125 5″ 330 144 18.5 280 270 17 F10 200 60
    150 6″ 350 150 24.5 320 300 22 F10 210 75
    200 8″ 415 204 30 380 375 27 F12 230 115
    250 10″ 455 238 39 445 450 36 F14 250 170
    300 12″ 490 268 39 520 515 36 F14 270 170
    350 14″ 545 294 49 585 580 46 F16 290 315
    400 16″ 575 320 60 650 660 55 F25 310 415
    450 18″ 660 341 60 710 685 55 F25 330 490
    500 20″ 700 383 80 775 755 75 F30 350 600
    600 24″ 785 442 80 915 890 75 F30 390 900
    700 28″ 800 590 150 1035 120 F35 430
    750 30″ 830 600 180 1090 130 F35 450
    800 32″ 860 720 200 1150 170 F40 470
    900 36″ 940 780 200 1270 180 F40 510
    1000 40″ 910 750 250 1240 200 F48 550
    1050 42″ 950 800 250 1290 210 F48 570
    1200 48″ 1000 850 250 1465 220 F48 630
    SIZE A B C D E Top Flange L WT(kg)
    Class600 PN63 PN100
    DN INCH Class600,PN63,PN100
    80 3″ 260 145 17.5 210 215 230 14 F07 180 50
    100 4″ 298 185 24.5 275 250 265 22 F10 190 70
    125 5″ 400 200 30 330 295 315 27 F12 200 90
    150 6″ 420 216 39 355 345 355 36 F14 210 125
    200 8″ 445 265 39 420 415 430 36 F14 230 200
    250 10″ 505 315 49 510 470 505 46 F16 250 315
    300 12″ 600 362 49 560 530 585 46 F16 270 435
    350 14″ 610 390 60 605 600 655 55 F25 290 485
    400 16″ 680 440 60 685 670 55 F25 310 685
    450 18″ 683 460 80 745 75 F30 330 815
    500 20″ 795 526 80 815 75 F30 350 1050
    600 24″ 885 623 940 F35 390 1600
    700 28″
    750 30″
    800 32″
    900 36″
    1000 40″
    1050 42″
    1200 48″

    Triple Offset Butterfly Valves

    Gain a comprehensive understanding of the Triple Offset Butterfly Valves by watching our informative video. Discover its intricate inner workings and see how it operates with precision and efficiency.



    FAQs

    What is a triple offset butterfly valve?

    A triple offset butterfly valve, an innovation in valve technology, is a highly engineered product designed with three distinct offsets to overcome the limitations of traditional butterfly valves. These offsets serve to eliminate friction, increase lifespan, and provide a tighter seal, reinforcing our commitment to quality control and exceptional performance.

    The first offset involves the placement of the shaft behind the disc, allowing for a complete 360-degree rotation. This design reduces wear and tear on the valve seat and disc, enhancing longevity and reliability.

    The second offset pertains to the eccentric mounting of the shaft in relation to the valve centerline. This creates a cam-like action during valve operation, ensuring a frictionless seal-to-seat contact when the valve is closed.

    The third offset, a unique feature of this valve type, introduces a conical profile to the seating surface. This geometric modification allows for a tight, bubble-proof seal that can withstand high pressures and temperatures, making these valves especially suited for stringent applications in industries like oil and gas, power generation, and chemical processing.

    How does a triple offset butterfly valve work?

    To understand how this valve works, it’s crucial to have a basic understanding of its structure. The triple offset butterfly valve consists of three key components: the body, disc, and actuator. The body is responsible for housing the internal workings of the valve while providing a sealed enclosure for fluid flow. The disc acts as the regulating element that controls the opening or closing of the valve based on external commands from an actuator.

    Now let’s dive into how this innovative technology operates. Unlike traditional valves with simple circular discs that rotate around a central axis to control flow, a triple offset butterfly valve has three separate offsets or eccentricities – hence its name. This means that when closing or opening the valve, instead of simply rotating on one axis like traditional valves do, it also moves along two other axes simultaneously.

    The difference between triple offset and double eccentric butterfly valves

    Triple offset butterfly valves, also known as triple eccentric or triple offset disc (TOD), are designed with a metal-to-metal seating configuration instead of the traditional elastomer seat used in other butterfly valves. This advanced sealing mechanism offers numerous benefits such as bubble-tight shut-off, resistance to high temperatures and pressures, and increased durability.

    Furthermore, unlike other butterfly valves that use a circular or conical disc shape to regulate flow, the TOD has an asymmetrically shaped disc with three distinct offsets – shaft offset (the axis of rotation is not aligned with the pipe centerline), cone axis offset (the cone does not exist on the central axis), and sealing surface offset (non-concentric seat). The combination of these offsets enables a “scraping” effect during valve operation that promotes self-cleaning of any debris build-up on the seat.

    On the other hand, double eccentric butterfly valves only have two offsets (shaft and cone) while maintaining concentric seating surfaces. These types of valves are commonly used for applications where tight shut-off is not critical but still require excellent control over flow rates.

    What medium conditions are triple eccentric used for?

    The unique design of triple eccentric valves allows them to handle high pressure and temperature applications efficiently while maintaining tight shut-off capabilities. Unlike traditional gate or globe valves which use a wedge or disk seating mechanism resulting in significant friction during operation, the triple eccentric valve utilizes an off-center shaft with three offsets – the first for sealing against line pressure, the second for reducing operating torque, and the third for eliminating seat wear. This unparalleled feature not only decreases mechanical stress on the valve but also reduces maintenance costs over time.

    1) High Pressure Applications: In industries where high-pressure systems are involved such as offshore drilling platforms or natural gas pipelines, using standard gate or butterfly valves can be problematic due to their susceptibility to cavitation (the formation and collapse of vapor bubbles). The triple offset design helps eliminate cavitation by allowing fluid flow directly through its body without any obstructions.

    2) High-Temperature Services: Triple offset valves can withstand extreme temperatures up to 1000°C due to their metal-to-metal sealing capability. This makes them ideal for applications involving steam lines in power plants or hot fluids in petrochemical plants.

    ASME ANSI 150LB Flange size

    NPSDNODPCBBoltn-bolt
    1/2DN158960.5164
    3/4DN209969.8164
    1DN2510879.2164
    11/4DN3211788.9164
    11/2DN4012798.6164
    2DN50152120.6194
    21/2DN65178139.7194
    3DN80190152.4194
    31/2(DN90)216177.8198
    4DN100229190.5198
    5DN125254215.922.58
    6DN150279241.322.58
    8DN200343298.422.58
    10DN25040636225.512
    12DN300483431.825.512
    14DN350533476.228.512
    16DN400597539.828.516
    18DN450635577.83216
    20DN5006936353220
    22(DN550)749692.23520
    24DN600813749.33520

    ASME ANSI 300LB Flange size

    NPSDNODPCBBoltn-bolt
    1/2DN159566.5164
    3/4DN2011782.6194
    1DN2512488.9194
    11/4DN3213398.6194
    11/2DN40155114.322.54
    2DN50165127198
    21/2DN65190149.422.58
    3DN80210168.122.58
    31/2(DN90)229184.222.58
    4DN100254200.222.58
    5DN12527923522.58
    6DN150318269.722.512
    8DN200381330.225.512
    10DN250444387.428.516
    12DN300521450.83216
    14DN350584514.43220
    16DN400648571.53520
    18DN450711628.63524
    20DN500775685.83524
    22(DN550)8387434124
    24DN600914812.84124