Triple-Offset Butterfly Valve Tri Lok®

Bray Tri Lok® triple-offset butterfly valve is designed for extreme service applications. Its cam-like triple-offset geometry eliminates friction between the seat and seal ring, while the metal-to-metal seal ensures reliable bidirectional zero-leakage sealing.

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Product Overview

Triple-offset valve providing zero-leakage and reliable performance in extreme service

Bray Tri Lok®: Reliable Isolation Valve for High-Pressure and High-Temperature Conditions

The Bray Tri Lok® valve is a high-performance butterfly valve designed for extreme service applications. Its cam-like triple-offset geometry eliminates friction between the seat and seal ring, reducing wear and extending service life, while the torque-sealed metal-to-metal seal ensures reliable bidirectional zero-leakage sealing.
Unique Feature: The splined disc/stem connection prevents misalignment, supports axial movement, and maintains seal integrity.
Performance: Operating temperature range from -320°F to 842°F (-196°C to 450°C) with pressure ratings up to ASME Class 150-900.
Applications: Bulk liquid storage, LNG, power generation, refining, chemical processing, cryogenic service, pulp and paper, shipbuilding, geothermal steam, and water and wastewater treatment.
Materials: Available in carbon steel, stainless steel, and high alloys including Inconel®, Hastelloy®, and XM-19.
Tri Lok features a compact, lightweight design, offering an efficient alternative to large valves, delivering safe, reliable, and long-lasting performance for critical industries worldwide.

Technical Specifications

Item	Parameters
Size Range	NPS 3 to 48 / DN 80 to 1200 Larger sizes available upon request
Body Material	Carbon Steel, Stainless Steel Other materials available upon request
Temperature Range	-320°F to 842°F (-196°C to 450°C) Higher temperatures available upon request
Stem Material	17-4PH, 410 Stainless Steel, XM-19 (Nitronic 50)
Maximum Allowable Working Pressure	ASME Class 150, 300, 600, 900 EN 1092 PN 10, 16, 25, 40, 63, 100, 150
Seat Material	316 Hardened Stainless Steel
Shut-Off Rating	Zero Leakage
Disc Material	Carbon Steel, Stainless Steel Other materials available upon request
Body Type	Lug, Wafer, Double Flanged, Gate, Butt Weld
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 Length	API 609, ASME B16.10, ISO 5752, EN 558
Fugitive Emission Standard	ISO 15848-1, API 641, TA Luft
Applications	Bulk Liquid Storage, Oil and Gas, LNG Transportation and Storage, Steam Distribution Systems, Power Generation, Geothermal Steam, Sugar and Ethanol, Pulp and Paper Black Liquor, Refining, Chemical Processing, Water and Wastewater Treatment, Air Separation, Cryogenic Equipment

Features and Benefits

Triple-offset butterfly valve Tri Lok® features and benefits

A Field-Replaceable Seat and Seal System

Fully field-replaceable seat and seal extend overall service life, minimize downtime, and reduce costly off-site repair or full replacement.

B Enhanced Seat Hardness

Superior performance, durability, and wear resistance compared to other materials, eliminating the risk of seat/seal wear.

C Metal-to-Metal Seal

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

D Packing Ring

Offers a flexible design and wide range of materials to provide torque-loaded sealing with zero leakage. (Solid packing ring optional).

E Splined Disc-to-Stem Connection

A robust and reliable connection that allows the stem to move axially independent of the disc, protecting the disc/stem connection from temperature fluctuations and pressure effects. This connection prevents common misalignment issues of rigidly connected discs and stems, minimizes hysteresis, eliminates external connections and associated hardware, and simplifies assembly and disassembly.

F Adjustable Stem Packing

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

G Robust Blowout-Proof Stem

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

H Indexed Stem

Provides visual indication of disc/packing ring position after installation.

I Extended Stem Bearings

Hardened bearings provide maximum stem support.

J Increased Body Wall Thickness

Provides greater corrosion allowance per API 600 standard.

K SIL 3 Capable

Tri Lok valve is SIL 3 capable, and as one of Bray’s many automated components, meets multiple SIL requirements.

FAQ

Why is the Tri Lok® triple-offset butterfly valve suitable for demanding isolation applications involving high temperature, high pressure, and low temperature?

Tri Lok® features a cam-shaped triple-offset geometry that disengages the disc seal ring from seat contact during opening and closing, reducing friction and wear. Its torque-seated metal-to-metal sealing design achieves bidirectional zero leakage. This series covers a temperature range of -196°C to 450°C and pressure ratings from ASME Class 150 to 900, making it suitable for high-temperature, high-pressure, cryogenic, and ultra-cryogenic isolation applications.

How does Tri Lok®'s triple-offset design affect valve life and sealing reliability compared to conventional butterfly valves?

Tri Lok®'s triple-offset design focuses on eliminating frictional contact between the seat and seal ring during the opening and closing stroke, thereby reducing sealing component wear. Combined with a hardened 316 stainless steel seat and metal-to-metal torque sealing, it maintains reliable bidirectional zero-leakage performance and helps extend service life under frequent operation or severe media conditions.

How to select a Tri Lok® valve for LNG, air separation, or other cryogenic systems?

Cryogenic system selection should first confirm the media, minimum and maximum operating temperature, design pressure, pipeline size, connection standard, and actuation method. Tri Lok®'s standard temperature range covers -196°C to 450°C, with sizes from NPS 3 to 48 (DN 80 to 1200), and offers carbon steel, stainless steel, and high-alloy material options. Specific body, disc, stem materials, and pressure ratings should be confirmed based on the actual model and application conditions.

What body connection types and pressure ratings are available for Tri Lok®?

Tri Lok® is available in lug, wafer, double-flanged, gate, and butt-weld body types. Maximum allowable operating pressures cover ASME Class 150, 300, 600, 900, and EN 1092 PN 10, 16, 25, 40, 63, 100, 150. Flange drilling can accommodate ASME B16.5, ASME B16.47, EN 1092, and ISO 7005 standards.

What structural features of Tri Lok® help reduce downtime and improve maintenance convenience after installation?

Tri Lok® features field-replaceable seat and seal systems, reducing the need for off-site repair or full valve replacement. The stem packing system is adjustable and field-replaceable, certified to international fugitive emission standards. Its splined disc-stem connection allows axial stem movement, reducing misalignment risk from temperature fluctuations and pressure effects. The indexed stem also provides visual indication of disc and packing ring position after installation, facilitating inspection and maintenance.