What is a triple offset butterfly valve?

A triple offset butterfly valve (TOBV/TOV) has three geometric offsets: 1st offset - stem behind disc center, 2nd offset - stem offset from pipe center, 3rd offset - the seat cone angle creates a conical sealing surface. This design provides metal-to-metal sealing with zero friction during operation.

What is the 3rd offset in a triple offset butterfly valve?

The 3rd offset is the cone angle of the seating surface. The seat and disc sealing surfaces are machined at an angle (typically 3-5°) to create a conical shape. This geometry ensures the disc contacts the seat only at the final moment of closing, eliminating friction during rotation.

Why is triple offset butterfly valve called zero friction valve?

Due to the conical seat geometry (3rd offset), the disc does not contact the seat during 99% of its rotation. Contact occurs only at the final moment of closing. This eliminates rubbing friction, reducing wear and torque requirements while extending valve life significantly.

What is the maximum pressure rating for triple offset butterfly valve?

Triple offset butterfly valves can handle pressures up to ANSI Class 2500 (approximately 420 bar/6000 PSI) depending on size and material. They are suitable for the most demanding high-pressure applications in oil & gas, power generation, and petrochemical industries.

What is the temperature range for triple offset butterfly valve?

Triple offset butterfly valves can operate from cryogenic temperatures (-196°C for LNG applications) up to +815°C (1500°F) for high-temperature steam and thermal oil. The temperature range depends on body and seat materials selected.

Is triple offset butterfly valve fire-safe?

Yes, triple offset butterfly valves with metal seats are inherently fire-safe. They are tested and certified per API 607 (Fire Test for Quarter-Turn Valves) and API 6FA. The metal-to-metal sealing maintains integrity even after the fire destroys soft seals.

Butterfly Valves

Triple Offset Butterfly Valve – Metal Seated (TOBV)

Name: Triple Offset Butterfly Valve (Metal Seated)
Brand: Supreme Valves
SKU: SV-BFV-TRIPLE-OFFSET
Rating: 4.8 (127 reviews)

The triple offset butterfly valve represents the pinnacle of butterfly valve technology. With three geometric offsets creating a conical sealing surface, it achieves zero-friction metal-to-metal sealing suitable for the most demanding applications including high pressure, high temperature, and cryogenic services.

The Three Offsets Explained

1st Offset: Stem behind disc centerline
2nd Offset: Stem offset from pipe centerline
3rd Offset: Conical seat angle (typically 3-5°)
This creates zero friction during rotation - contact only at final closing moment.

Key Standards & Certifications

API 609 ASME B16.34 API 607 Fire-Safe API 6FA BS EN 593

Size: DN50 - DN1500 (2" - 60") | Pressure: Class 150-2500, PN10-PN420

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Materials of Construction (MOC)

Component	Material Specification
Body & Bonnet	Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle	SS 410 / SS 420
Seat / Trim	EPDM / NBR / Bronze

Technical Specifications

Parameter	Specification / Standard
Manufacturing / Design Standard	EN 1171 / AWWA C509 / BS 5163
Testing Standard	API 598 / EN 12266-1
Pressure Rating	PN16 / PN25