ASTM A351 CF8M Floating Ball Valve is an industrial-grade valve constructed with a cast CF8M stainless steel body, widely used in high-corrosion, medium-to-high pressure applications such as oil & gas, chemical processing, power generation, and marine engineering. Its key feature lies in the floating ball design, where the ball shifts slightly under fluid pressure to press tightly against the downstream seat, ensuring reliable unidirectional sealing. Compact in structure and easy to operate, it's ideal for small-to-medium diameter piping systems.
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ASTM A351 CF8M Floating Ball Valve – Detail Information Table
| Item | Specification |
|---|---|
| Body Material | ASTM A351 CF8M (equivalent to 316 stainless steel) |
| Ball Material | ASTM A182 F316 / F304 |
| Stem Material | ASTM A182 F316 / F304 |
| Seat Material | PTFE, RPTFE, PPL, Metal Seat (optional based on service condition) |
| End Connection | Flanged, Threaded (NPT/BSP), Socket Weld |
| Actuation Type | Manual (lever), Pneumatic, Electric, Worm Gear |
| Temperature Range | -29°C ~ 200°C (soft seat); -29°C ~ 500°C (metal seat) |
| Applicable Media | Water, oil, gas, corrosive liquids, steam, etc. |
| Design Standards | API 6D, API 608, ISO 17292 |
| Testing Standards | API 598, ISO 5208 |
| Fire-Safe Compliance | Meets API 607 / API 6FA (optional) |
| Quality Assurance | 100% pressure tested before shipment; 18-month warranty or 12 months after installation |
ASTM A351 CF8M Floating Ball Valve – Technical Specifications Table
| Parameter | Range |
|---|---|
| Nominal Size | 1/4" ~ 4" (DN8 ~ DN100) |
| Pressure Rating | 150LB, 300LB, 600LB, 1000WOG, PN64 ~ PN160 |
| Body Structure | 1PC, 2PC, 3PC (One-piece, Two-piece, Three-piece) |
| Flow Path | Full Bore or Reduced Bore |
| Operating Torque | Low torque due to self-compensating seat design |
| Sealing Level | Bubble-tight sealing, up to ISO 5208 Class VI (gas) |
| Applicable Standards | API 6D, ASME B16.34, ASME B16.10, ASME B16.5 |
| End Face Connection | ASME B16.5 (Flange), ASME B16.11 (Socket Weld), NPT/BSP Thread |
ASTM A351 CF8M Floating Ball Valve – Product Standards Table
| Standard Type | Standard No. | Description |
|---|---|---|
| Material Standard | ASTM A351 CF8M | Specifies chemical composition and mechanical properties for cast stainless steel |
| Design Standards | API 6D | Design and manufacturing standard for pipeline valves |
| API 608 | Dedicated standard for small-bore metal ball valves | |
| ISO 17292 | General international standard for metal ball valves | |
| Face-to-Face Dimension | ASME B16.10 | Defines structural length of valves |
| Flange Connection | ASME B16.5 / B16.47 | Flange dimensions and facing standards |
| Butt-Weld End | ASME B16.25 | Standard for butt-weld end connections |
| Testing Standards | API 598 | Standard for valve inspection and testing |
| ISO 5208 | Industrial valve sealing performance test standard | |
| Fire Test | API 607 | Fire safety test for soft-seated ball valves |
| API 6FA | More rigorous fire test standard |
ASTM A351 CF8M Floating Ball Valve – Product Features
High-Strength Corrosion-Resistant Body: Made from ASTM A351 CF8M casting, equivalent to 316 stainless steel, offering excellent resistance to chloride stress corrosion and pitting-ideal for seawater and acidic environments.
Floating Ball Design: The ball moves slightly under pressure to press against the downstream seat, enhancing sealing reliability, especially in unidirectional applications.
Self-Compensating Elastic Seat: Ensures sealing at low pressure via pre-load and automatically compensates under high pressure for stable performance across all pressure ranges.
Fire-Safe Structure: Metal-to-metal backup sealing remains functional after fire exposure, minimizing leakage; complies with API 607.
Multiple Actuation Options: Compatible with manual, pneumatic, electric, and worm gear drives, suitable for automated control systems.
Full Bore Option Available: Reduces flow resistance and supports pipeline pigging operations.
OEM Customization Supported: Can be branded as DMS, POWELL, etc., and tailored for non-standard operating conditions.
GNEE A351 CF8M Floating ball valve factory
FAQ
What is a floating ball valve
A floating ball valve is a type of valve in which the ball has no fixed shaft support and can produce a small displacement under the action of medium pressure to press against the downstream valve seat to achieve a seal. It belongs to the single-sided forced sealing structure and has the characteristics of simple structure, reliable sealing, low flow resistance, and rapid opening and closing. It is widely used in medium and low pressure industrial pipeline systems such as petroleum, chemical, natural gas, power and water treatment.
What is the difference between a ball valve and a float ball valve
Ball valves control the flow of fluid by rotating a ball, primarily used for cutting off or distributing media in pipelines; while float valves automatically open and close the valve by using a float that rises and falls with the liquid level, their core function being automatic level control in containers such as water tanks.
Their working principles and application scenarios are completely different. Ball valves are manual or automatic control valves, while float valves are self-leveling devices based on the principle of buoyancy.
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