Engineered to ASTM A351 CF8 standards, this 304 Stainless Steel floating ball valve offers superior chemical stability in moderately corrosive media. Available in sizes from 1/2" to 8" (Class 150/300), it utilizes a pressure-assisted mechanism with PTFE/RPTFE seats to ensure ANSI Class VI zero-leakage performance. With integrated safety features like an anti-blowout stem and API 607 fire-safe design, it remains a cost-effective, reliable solution for the chemical, food, and pharmaceutical industries.
Drawning of CF8 Floating Ball Valve
Technical Specifications
| Item | Specifications |
| Design Standard | API 6D / ASME B16.34 / BS 5351 |
| Face to Face | ASME B16.10 |
| Flange End Standard | ASME B16.5 |
| Pressure Rating | Class 150 / Class 300 / PN16 / PN40 |
| Size Range | 1/2" - 8" (DN15 - DN200) |
| Working Temperature | -29°C to 180°C (Depends on seat material) |
| Leakage Class | ANSI/FCI 70-2 Class VI (Zero Leakage) |
| Test & Inspection | API 598 / API 6D |
Main Material List (Bill of Materials)
| No. | Part Name | Material (ASTM Standard) |
| 1 | Body | ASTM A351 CF8 (Cast 304 SS) |
| 2 | Ball | ASTM A351 CF8 / ASTM A182 F304 |
| 3 | Seat | PTFE / RPTFE (Reinforced PTFE) |
| 4 | Stem | ASTM A182 F304 / SS304 |
| 5 | Gasket | PTFE / Flexible Graphite + SS304 |
| 6 | Packing | PTFE / Flexible Graphite |
| 7 | Cap / Bonnet | ASTM A351 CF8 |
| 8 | Bolts / Nuts | ASTM A193 B8 / A194 8 |
Main Connection and Outline Dimensions (Class 150)
Note: The following data are reference values for Class 150. Actual dimensions may vary slightly by manufacturer.
| Size (Inch) | DN (mm) | L (mm) | D (Flange OD - mm) | C (Bolt Circle - mm) | n-Φ (Bolt Holes) | H (Height - mm) | W (Handle - mm) |
| 1/2" | 15 | 108 | 89 | 60.3 | 4-Φ16 | 65 | 130 |
| 1" | 25 | 127 | 108 | 79.4 | 4-Φ16 | 85 | 160 |
| 2" | 50 | 178 | 152 | 120.7 | 4-Φ19 | 120 | 230 |
| 3" | 80 | 203 | 190 | 152.4 | 4-Φ19 | 165 | 350 |
| 4" | 100 | 229 | 229 | 190.5 | 8-Φ19 | 195 | 400 |
| 6" | 150 | 394 | 279 | 241.3 | 8-Φ22 | 270 | 650 |
| 8" | 200 | 457 | 343 | 298.5 | 8-Φ22 | 340 | 800 |
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FAQ
What is CF8 in valve?
CF8 is the material designation for Cast 304 Stainless Steel, governed by the ASTM A351 standard.
In the valve industry, it is the most common stainless steel material used for valve bodies and parts. Key points include:
Chemical Composition: It contains approximately 18% Chromium and 8% Nickel.
Corrosion Resistance: It provides excellent resistance to oxidation and many corrosive chemicals.
Applications: Widely used for water, oil, gas, and chemicals in the food, pharmaceutical, and petrochemical industries.
Wrought Equivalent: If the valve were made from forged steel instead of being cast, it would be called SS304 or F304.
What is the difference between floating ball valve and trunnion ball valve?
The main difference is how the ball is supported and how it creates a seal:
1. Floating Ball Valve
Mechanism: The ball is not fixed at the bottom. It is held in place by the seats.
Sealing: When the valve is closed, the upstream pressure pushes (floats) the ball against the downstream seat, creating a seal.
Best For: Smaller sizes (typically up to 8") and lower pressure classes.
Key Advantage: Simpler design and more cost-effective.
2. Trunnion Mounted Ball Valve
Mechanism: The ball is fixed in place by a shaft at the top and a support pin (the trunnion) at the bottom.
Sealing: Since the ball cannot move, the seats are spring-loaded and are pushed against the ball by the pressure to create a seal.
Best For: Large sizes and high-pressure/severe service.
Key Advantage: Much lower operating torque and less wear on the seats.
What is CF8 equivalent to?
CF8 is the casting equivalent to AISI 304 Stainless Steel.
Here is how it breaks down across different forms:
Wrought/Plate: AISI 304
Forged: ASTM A182 F304
Cast: ASTM A351 CF8
European Standard: 1.4308
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