Triple Offset Butterfly Valve

VF-8A Triple Offset Butterfly Valve

The VF-8A features a metal-to-metal triple offset sealing design—offering bubble-tight shutoff, minimal wear, and superior performance under severe service conditions.

✅ Maximum temperature rating: up to 760°C (1400°F)

✅ Customizable to application-specific conditions

Global Certifications & Achievements

Certified in 10+ countries

Over 138 product-type approvals

Valve size capability: up to 3600mm

45+ years of manufacturing experience

Exported to 45+ countries

Key Certifications


TÜV Rheinland	PED(H) (Pressure Equipment Directive) ATEX 94/9/EC – Explosion-proof Compliance ISO 10497 / API 607 – Fire-safe Testing API 609 ISO 15848-1 / ISA 93.00.01 – Fugitive Emissions Testing BS 6364 – Cryogenic Testing IEC 61508-1 SIL 3 – Functional Safety
TSG	TSG D7002-2006 – China Special Equipment Certification

SHAFT STRENGTH UPGRADED

Shaft strength increased by splinedshaft without drilling on the shaft fortaper pin. Pin-less design provides easilymaintenance work.

DUST PROOF DESIGN

A set of bushing design prevents theingress of foreign material into theshaft area.

SEALING DESIGN

The soft sealing of graphite forlaminated seat is placed on thebody which reducing the possibilityof graphite gets wear further leads toleakage. The graphite is positioned inthe notch of the sealing seat in orderto allow for easy repair.

We provides

laminated seat -75~550 ℃ (-103~1022 ℉ )

solid metal seat as well.-196~760 ℃ (-321~1400 ℉ )

DISC HARD FACE

The standard disc is built with a Stelliteweld overlay or Hard chrome plated,hard face provides increasedhardness and wear resistance withlong service life.

BLOW-OUT PROTECTION

Both the shaft stop and bottom coveroffers reliable blowout protection.

DISC INDICATION

Disc indication marked at theshaft end to clearly identify thedisc opening degree at anytime.

BI-DIRECTIONAL SHUTOFF DESIGN

The floating sealing design is selfadjustableand the sealing surfacesof an elliptical sealing system arecompletely in contact at the finalpos i t i on only.

This mechanismprovides flawless bubble tight shutoff.

Specifications

Technical specifications are for reference only.

Value Valves reserves the right to modify product design without prior notice.


Size Range 4"- 48" \| DN 100 - DN 1200	Face-to-Face API 609 \| ISO 5752
Pressure Ratings -100°C to +550°C (-148°F to +1022°F)	Marking Standard MSS-SP-25
Pressure Ratings 150 LB \| 300 LB \| 600 LB \| 900 LB	Design Flange ASME B16.5 Class 150/300 ASME B16.47 Class 150/300
Body Styles Wafer \| Lug \| Double Flanged	Testing Standard ISO 5208 \| API 598 \| MSS SP-61 \| MSS SP-68
Seat Type All-Metal Seat / Laminated Seat	Fire Testing API 607 \| ISO 10497
Body Wall Thickness ASME B16.34	Fugitive Emissions ANSI/ISA-SP-93 \| TA-Luft \| ISO 15848 \| API 641
Operator Mounting Flange ISO 5211	Explosion-proof ATEX 94/9/CE Group II Category 2 GD
Design Flange ASME B16.34 \| ASME B16.5 \| EN 593	Leakage Class ANSI FCI 70-2-2003 Table 1 CLASS V ISO 5208 Rate A \| ANSI/ISA-SP-93

Customization Options

Solutions

Customization Options

Size & Materials

Special sizes and alloys available upon request to meet specific temperature and fluid requirements.

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Jacketed Design

Maintain fluid temperature to prevent solidification or viscosity changes in pipelines.

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Extended Stem Design

Ideal for high/low-temperature environments—reduces thermal conduction for operator safety.

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Performance & Testing Facilities

Fire Testing Laboratory

Simulates real fire scenarios to evaluate pressure resistance and fire-safe integrity.

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Cryogenic Testing

Performs valve functionality tests at cryogenic temperatures down to -196°C, ensuring product reliability.

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ISO-Class Clean Room

Supports oil-free cleaning and polishing for internal surfaces, meeting clean-service requirements.

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Cycle Life Testing

Verifies long-term durability through repeated opening/closing cycles under simulated service conditions.

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Emissions Testing

Assesses fugitive emissions in control valves under volatile or hazardous fluid environments.

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Pressure Testing

All valves undergo full hydrostatic testing to meet both international standards & customer specifications.

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Size Range 4"- 48" \| DN 100 - DN 1200	Face-to-Face API 609 \| ISO 5752
Pressure Ratings -100°C to +550°C (-148°F to +1022°F)	Marking Standard MSS-SP-25
Pressure Ratings 150 LB \| 300 LB \| 600 LB \| 900 LB	Design Flange ASME B16.5 Class 150/300 ASME B16.47 Class 150/300
Body Styles Wafer \| Lug \| Double Flanged	Testing Standard ISO 5208 \| API 598 \| MSS SP-61 \| MSS SP-68
Seat Type All-Metal Seat / Laminated Seat	Fire Testing API 607 \| ISO 10497
Body Wall Thickness ASME B16.34	Fugitive Emissions ANSI/ISA-SP-93 \| TA-Luft \| ISO 15848 \| API 641
Operator Mounting Flange ISO 5211	Explosion-proof ATEX 94/9/CE Group II Category 2 GD
Design Flange ASME B16.34 \| ASME B16.5 \| EN 593	Leakage Class ANSI FCI 70-2-2003 Table 1 CLASS V ISO 5208 Rate A \| ANSI/ISA-SP-93

Triple Offset Butterfly Valve | VF-8A

VF-8A Triple Offset Butterfly Valve