Triple Offset Butterfly Valve Bray Tri Lok https://www.bray.com/images/default-source/products/trilok/f0-trilok/f0-1000-110ez_thumbnail_.png?sfvrsn=e2ca9c69_4

Triple Offset Butterfly Valve

Tri Lok

Size Range
3" – 48” (DN80 – DN1200)
Larger sizes available upon request
Temperature Range
-320°F to 842°F
(-196°C to 450°C)
Higher temperatures available upon request
Maximum Allowable Operating Pressure
ASME Class 150, 300, 600, 900
PN10 - PN150

Specifications

Triple Offset Butterfly Valve - Tri Lok

Size Range
3" – 48” (DN80 – DN1200)
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 available upon request
Stem Materials
17-4PH, 410 Stainless Steel, & XM-19 (Nitronic 50)
Maximum Allowable Operating Pressure
ASME Class 150, 300, 600, 900
PN10 - PN150
Seat Materials
316 Stainless Steel Hardened
Shutoff Rating
Zero Leakage
Disc Materials
Carbon Steel, Stainless Steel
Other Materials Upon Request
Body Style
Lug - Double Flanged, Short - Double Flanged, Long (Gate) - Buttweld
Design Standard
API 609, ASME B16.34, ASME VIII, API 600
Flange Drilling
ASME B16.5, ASME B16.47, EN 1092-1, ISO 7005
Testing Standard
ISO 5208, EN12266-1, API 6D, API 598, BS 6755
Certifications
API 607, ISO 10497, ISO 15848-1, API 641, TA Luft, CRN, ABS, EAC, PED, SIL, TSG, ATEX
Face to Face
API 609, ASME B16.10, ISO 5752, EN 558
Fugitive Emissions
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 & Benefits

Bray proudly offers the Tri Lok triple offset butterfly valve, a premier isolation valve well-suited for operation in light vacuum to high-pressure applications and ideally suited for applications requiring absolute zero leakage. Compared to gate, globe or ball valves of the same size and pressure class, Tri Lok provides space and weight savings while minimizing installation and maintenance costs.

Tri Lok’s, non-rubbing, metal-to-metal seal delivers zero leakage with minimal torque and is certified fire-safe. The resiliency of the seal ring ensures uniform peripheral sealing with the seat, achieving full shutoff regardless of flow direction. Tri Lok offers a solid metal seal ring for high-temperature and severe service applications to ensure bi-directional shutoff throughout the full pressure/temperature range.

Bray Tri Lok is the only valve in its class with a splined disc/stem connection. The Tri Lok connection allows axial movement of the disc independent of the stem, keeping the seal ring and seat in position and unaffected by temperature fluctuations and pressure effects on the stem. This design prevents the typical misalignment problems of rigidly attached discs and stems to offer maximum strength. Close tolerance engagement between the disc and stem minimizes hysteresis.

 

Triple Offset Geometry

The Triple offset valve or triple eccentric valve features a stem that is offset on both the X (1) and Y (2) axis of the butterfly valves center-line. This produces a cam-like motion as the valve operates. The third offset (3) consists of an inclined conical profile machined into the valve sealing surface, allowing rotary engagement and disengagement of the seat and seal ring without interference. This triple offset eliminates all rubbing between the seat and seal ring during valve travel, reducing seat and seal wear and extending cycle life.

Once the seat and seal ring are fully engaged, torque is applied in order to create a bi-directional, zero leak, metal-to-metal seal. For this reason, triple offset valves are often defined as "torque-seated" rather than "position-seated" as in the case of resilient or high-performance products.
Triple Offset Butterfly Valve Tri Lok Cut away

  • A. Field-Replaceable Seat & Seal System

    The fully field-replaceable seat & seal extends overall life, minimizes downtime, and reduces the need for costly off-site repairs or total replacement.

  • B. Enhanced Seat Hardness

    Eliminates risk of seat/seal galling, offering superior performance, durability, and abrasion resistance compared to other materials.

  • C. Metal-to-Metal Sealing

    Tri Lok’s non-rubbing, metal-to-metal sealing system is inherently firesafe and fire-tested, while meeting zero-leakage requirements for many critical applications.

  • D. Seal Ring

    Offers a flexible design and wide range of materials to provide torque-loaded sealing with zero-leakage. (Optional solid seal ring available.)

  • E. Splined Disc-to-Stem Connection

    The strong and reliable connection allows for axial movement of the stem independent of the disc, to protect the disc/stem connection from temperature fluctuations and pressure effects. This connection prevents typical misalignment problems of rigidly attached discs and stems, minimizes hysteresis, eliminates external connections & associated hardware, and allows for easy assembly & disassembly.

  • F. Adjustable Stem Packing

    Fully-adjustable, field-replaceable stem seal system is certified to international fugitive emission standards.

  • G. Robust Blowout-Proof Stem

    One-piece stem features blowout prevention ring located outside of the pressure boundary, as well as redundant blowout prevention mechanisms fully conforming to API 609 and safety requirements.

  • H. Indexed Stem

    Provides positive visual indication of disc/seal ring position after installation.

  • I. Elongated Stem Bearings

    Hardened bearings provide maximum stem support.

  • J. Increased Body Wall Thickness

    In accordance with API 600, provides greater corrosion allowance.

  • K. SIL 3 Capable

    The Tri Lok valve is SIL 3 capable, while also offered as one of Bray’s many automated packages that meet various SIL requirements.

Request A Quote