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