VF-8A Triple-Offset

KEY FEATURES

Disc Position Indicator

Clearly marked indicator on the shaft top allows easy identification of disc position at any time.

Hardened Disc Surface

Standard discs are reinforced with Stellite weld overlay or hard chrome plating, delivering high durability, superior wear resistance, and extended service life.

Anti-Leakage Seat Overlay Design

A multi-layer soft graphite overlay is embedded directly into the valve body, reducing wear and minimizing leakage.
Graphite is positioned in a grooved seat for easy maintenance and replacement.

Optional: multi-layer or solid metal seats also available 

Dust Protection Design

Special bushing assembly prevents any foreign particles or contaminants from entering the shaft area.

Enhanced Shaft Strength

Shaft features special grooved design — eliminating the need for taper pin drilling and increasing strength and reliability.

Explosion Protection

Both shaft stop pin and bottom cover are engineered for high-level explosion safety compliance.

Easy Maintenance Disc

Pinless disc design simplifies disassembly and maintenance.

Bidirectional Sealing Design

Floating self-adjusting sealing mechanism with elliptical contact surfaces ensures zero leakage only when in the fully closed position.

For flanged-end valved, shaft positioning on the flange side helps reduce external leakage caused by ambient temperature fluctuations.

TECHNICAL SPECIFICATIONS

Design & Pressure/Temperature Ratings

• ASME B16.34

• API 609

Pressure Test Standards

• API 598

• ISO 5208

Flange Drilling Standards

• ASME B16.5 / ASME B16.47

• ISO 7005 / EN 1092

Mounting Flanges

• ISO 5211

Face-to-Face Dimensions

• API 609

• ISO 5752

• ASME B16.10

Fire Safe Compliance

• API 607

• ISO 10497

Low Emissions Standards

• ANSI/ISA-SP-93

• ISO 15848

• TA LUFT

Cryogenic Applications

• BS 6364

Product Marking

• MSS-SP-25

• ASME B16.34

Leakage Class

• ANSI FCI 70-2 Class V

• ISO 5208 Rate A

Quality Assurance

• ISO 9001

• PED 2014/68/EU (Module H)

• ATEX 2014/34/EU

• SIL 3 (suitable for safety systems up to SIL 2 in low demand mode; compliant for SIL 3 in redundant architectures)

International Certifications

• API 609 Monogram

• API 607

• ISO 15848

• ISO 10497

• TR CU 010

• TR CU 032

TYPICAL APPLICATIONS

• Petrochemical industry

• Thermal & cogeneration power plants

• Steel plants

• Oil refineries

• Cryogenic environments

• Pulp & paper industry

• Nuclear power sector