All metal seal butterfly valve

All metal seal butterfly valve

Brief Description: Offering a wide range of bidirectional triple eccentric butterfly valves 

with zero leakage. Low torque ensures easy operation, and the metal seat design allows 

for use in harsh environments. Seats and seals are replaceable and can be maintained online.

Diameter: DN50~DN3000 Pressure: CLASS 150~2500 Temperature: -196℃-+818℃ 

Material: Stainless steel/alloy steel/duplex stainless steel Product model: BL Manufacturer: American Brown

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Offering a wide range of bi-directional triple eccentric butterfly valves with zero leakage. Low torque ensures easy operation, and the metal seat design allows for use in harsh environments. Seats and seals are 

replaceable and can be maintained online. Triple offset butterfly valve complies with API609 standard.

  Size: 2″~120″ (DN50~DN3000)

Pressure level: ASME CLASS 150~2500

Main material: carbon steel, stainless steel, alloy steel, duplex stainless steel

Terminal connection: RF

Operation mode: gear, pneumatic, electric, hydraulic

Class 150 to Class 2500 rated valves



metal base

Closed in both directions

Zero leakage

Replaceable disc seal

Save costs through smart design


Metal base:

Metal-to-metal seal ensures zero leakage

The valve does not require a plug in the closed position, the valve body is a natural plug for the sealing ring

Inherently fire resistant by design

Disc cannot pass through seat in overtravel position

Applying higher torque results in greater sealing ability

Less maintenance required and lifetime cost savings

Better operability

longer life

Operation speed

Requires lower torque than other valve designs, especially ball valves

Suitable for modulation applications



Fire safety is ensured through design:

No soft parts will burn in a fire

No change in valve performance before, during and after fire

Meaning zero leakage performance is ensured before, during and after a fire

Has successfully passed fire safety testing and meets the following requirements:

  – API 607 (7th edition)

  – BS EN12266-1:2003

  – ISO 10497 – 2010

Zero leakage:

"Zero leakage is defined as the ability to pass every test of all international standards with ZERO BUBBLES AIR and/or DRIP WATER"

Successfully passed zero leakage test.

NOTE: Bubble seal is the most commonly misused term in the valve industry!

Air tightness per ANSI B16.104 cl.VI/API 598/MSS SP61 means leakage is allowed.

For example, for an 8-inch valve, 45 bubbles per minute are allowed; for a 24-inch valve, 400 bubbles per minute are allowed.


Intelligent design saves costs

Requires less maintenance, resulting in cost savings over its lifetime

longer life

Requiring up to 80% less material compared to ball valves, the potential for cost savings is huge for new and replacement projects



typical application:

process fluid


Steam/geothermal steam

Hot/sour gas (NACE)

oxygen, hydrogen

blow down

Sulfur recovery

Acids, caustics, chlorides


Production range:

IN 3″ – 160″ ANSI Cl. 150

IN 3″ – 80″ ANSI Cl.300

IN4" – 80" ANSI Cl. 600

IN 6" – 48" ANSI Cl. 900

IN 6" – 24" ANSI body in ANSI Cl. 1500

ANSI Cl. 2500 with ANSI Cl.900 trim





super duplex



254 SMO

WC6, WC9 alloy steel


Alloy 20

aluminum bronze


Temperature limits:

From -196°C (-320°F) to +818°C (+1600°F)

Pressure limit:

From full vacuum to +450 Bar (2200 psi)


NP 6-10 – 16 – 25 – 40 – 64 – 100

ANSI Cl. 150 – 300 – 600 – 900 – 1500 – 2500

Applicable standards:

Design: ANSI B16.34/ASME VIII

Face to face: API/ISO/ANSI


Test: Zero leakage

Fire Test: BS 6755 – API 607 4th Edition