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Triple Offset Butterfly Valve

Tri Lok

Size Range
3 – 48” (80 – 1200mm)
Temperature Range
-320°F to 842°F (-196°C to 450°C)
Pressure Ratings
ASME Class 150, 300, 600, 900

Specifications

Triple Offset Butterfly Valve - Tri Lok

Size Range
3 – 48” (80 – 1200mm)
Body Materials
Carbon Steel, Stainless Steel & Other Materials Upon Request
Temperature Range
-320°F to 842°F (-196°C to 450°C)
Stem Materials
17-4PH, 410 Stainless Steel, & XM-19 (Nitronic 50)
Pressure Ratings
ASME Class 150, 300, 600, 900
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, Wafer, and Gate
Design Standard
API 609, B16.34
Flange Drilling
ASME B16.5, B16.47, ISO 7005
Testing Standard
API 598 (Soft Seat), API 6D, ISO 5208
Certifications
API 607, ISO 10497, ISO 15848-1, API 641, TA Luft, CRN, ABS, GOST, PED, SIL, TSG
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 standard, non-rubbing, metal-to-metal sealing system delivers zero leakage with a minimal amount of torque and is inherently 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.

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 stem is offset on both the X (1) and Y (2) axis of the valve's center-line. This produces a cam‑like motion. 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 eliminates all rubbing between the seat and seal ring.

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.

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  • A. Stem

    Tri Lok's unique splined disc-to-stem connection minimizes hysteresis, eliminates external connections (and associated hardware) and allows for easy assembly and disassembly that's as simple as Tri Lok features a one-piece stem with a blowout prevention ring located above the packing box, outside the pressure boundary, in accordance with international standards. In accordance with API 609, every stem is indexed, providing positive local indication of disc/seal ring location once installed in the piping system.

  • B. Packing

    Fully adjustable stem seal system (packing gland) eliminates fugitive emissions and is also field replaceable.

  • C. Bearings

    Bearing seals minimize ingress of media into the journal and are furnished as standard. Stem bearing are elongated to provide maximum support of the stem.

  • D. Seat & Seal Ring

    Fully replaceable seat and seal ring system extends the overall life of every Tri Lok valve, minimizing downtime without the need for costly offsite repairs or total replacement.

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