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Butterfly Valve

Triple Offset Butterfly Valves(TOBV)

Triple offset butterfly valves are a specialized type of butterfly valve that offer superior sealing performance, extended service life, and lower maintenance requirements compared to standard butterfly valves.
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Triple Offset Butterfly Valve

Specifications

Butterfly Valve - Tripple Offset Butterfly Valves(TOBV)
Size Range

NPS 3 to 48 / DN 80 to 1200 Larger sizes available upon request

Body Materials

Carbon Steel, Stainless Steel Other Materials Upon Request

Temperature Range

-320°F to 842°F (-196°C to 450°C) Higher temperatures upon request

Stem Materials

17-4PH, 410 Stainless Steel, XM-19 (Nitronic 50)

Maximum Allowable Operating Pressure

ASME Class 150, 300, 600, 900 EN 1092 PN 10, 16, 25, 40, 63, 100, 150

Seat Materials

316 Stainless Steel Hardened

Shutoff Rating

Zero Leakage

Disc Materials

Carbon Steel, Stainless Steel Other Materials Upon Request

Body Style

Lug, Wafer, Double Flanged, Gate, Buttweld

Design Standard

API 609, ASME B16.34, ASME VIII, API 600

Flange Drilling

ASME B16.5, ASME B16.47, EN 1092, ISO 7005

Testing Standard

ISO 5208, EN12266-1, API 6D, API 598, BS 6755

Certifications

ABS, API 607, ATEX, CRN, ISO 10497, PED, PE(S)R, SIL, TR CU, TSG

Face To Face

API 609, ASME B16.10, ISO 5752, EN 558

Fugitive Emissions Standard

ISO 15848-1, API 641, TA Luft

Applications

Bulk liquid storage, oil & gas, LNG storage & transportation, steam distribution systems, power generation, geothermal steam, sugar & ethanol, pulp & paper liquor, refining, chemical processing, water & wastewater, air separation, cryogenic services

Features:
  1. Triple Offset Design: The key feature is the three intentional offsets in the valve body. These offsets position the disc so that it contacts the seat in a camming action only at closure, minimizing friction during operation . This reduces wear on the sealing surfaces and allows for a tighter seal.

2. Metal-to-Metal Sealing: Triple offset butterfly valves typically use a metal-to-metal seat design, eliminating the need for elastomers or soft materials that can deteriorate over time or with exposure to harsh chemicals.

3. No Cavities: The design eliminates gaps or cavities between the sealing surfaces, preventing particles from getting trapped and compromising the seal.

Benefits:

  1. Bubble-Tight Shut-Off: Due to the features mentioned above, triple offset butterfly valves achieve a “bubble-tight” closure, meaning no leakage even at very low levels. This makes them ideal for critical applications where even minimal leakage cannot be tolerated.
  2. Low Operating Torque: The reduced friction during operation translates to lower torque required to open and close the valve. This simplifies automation and reduces the size and power of actuators needed.
  3. Long Service Life: The minimal wear on the sealing surfaces due to the offset design extends the operational life of the valve significantly.
  4. High-Pressure and Temperature Capability: The metal-to-metal sealing and robust design allow triple offset butterfly valves to handle high-pressure and high-temperature applications.
  5. Reduced Maintenance: With fewer moving parts and a more durable design, triple offset butterfly valves require less frequent maintenance compared to standard butterfly valves.
  6. Wide Range of Applications: Their suitability for clean fluids, harsh chemicals, high pressures, and high temperatures makes them a versatile choice across various industries like oil & gas, power generation, chemical processing, water treatment, and marine applications.

Triple offset butterfly valves offer a superior sealing performance, longer lifespan, lower maintenance requirements, and wider applicability compared to standard butterfly valves. However, they may come at a higher initial cost.

FAQs:

  • Bubble-tight shut-off: Ensures no leakage even at minimal levels, ideal for critical applications.
  • Low operating torque: Requires less force to open and close, simplifying automation.
  • Long service life: Reduced wear and tear leads to extended operation.
  • High-pressure and temperature capability: Handles demanding environments.
  • Reduced maintenance: Fewer moving parts and a durable design minimize maintenance needs.
  • Wide range of applications: Versatile for various industries due to its robust features.
  • Higher cost: Fabrication process can be more expensive than standard butterfly valves.
  • Limited throttling capability: Not ideal for precise flow control applications.
  • Directional flow: While some can handle bi-directional flow, some models have a preferred flow direction for optimal sealing.

  • These valves are ideal for applications requiring:

    • Leak-proof operation: Chemical processing, power plants, oil & gas pipelines.
    • High-pressure or high-temperature environments: Power generation, steam lines, hot oil systems.
    • Low-maintenance solutions: Industrial plants seeking to minimize downtime.
  • Pressure and temperature rating: Choose a valve exceeding your application’s requirements.
  • Pipe size and flange type: Ensure compatibility with your piping system.
  • Material selection: Select appropriate body, disc, and seat materials for the fluid being handled.
  • Actuation type: Decide on manual, pneumatic, or electric actuation based on automation needs.
  • Flow direction: Consider if a bi-directional or unidirectional flow valve is needed.

Triple offset valves have an additional offset in the seating surface compared to double offset valves. This extra offset creates a camming action that eliminates disc-to-seat contact during most of the opening and closing cycle, leading to even lower friction and longer lifespan.

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