API 6D (Pipeline Valves): This is the gold standard for midstream applications. It covers valves used in long-distance transportation pipelines (oil, gas, and water). These valves must endure outdoor environments, soil stress, and massive pressure surges.
API 608 (Metal Ball Valves): This standard is for downstream applications. It is the go-to for oil refineries, chemical processing plants, and power facilities. These valves operate within a controlled factory environment where process precision is key.
Don't Over-Engineer: Is API 608 Sufficient or is API 6D Mandatory for Your Project?
Technical Specification Tables: API 6D Pipeline Ball Valves
| Parameter | Description / Range |
| Design Standard | API Spec 6D / ISO 14313 |
| Nominal Size Range | NPS 2" ~ NPS 60" (DN 50 ~ DN 1500) |
| Pressure Class | ASME Class 150, 300, 400, 600, 900, 1500, 2500 |
| End Connections | Flanged (RF, RTJ), Butt-Welded (BW) |
| Construction Type | Trunnion Mounted: Typical for NPS 4" and above <br> Floating Ball: Typical for NPS 4" and below |
| Working Temperature | -196°C ~ 550°C (Subject to material selection) |
API 6D Ball Valve Common Materials (ASTM Standards)
| Component | Common Materials (ASTM) |
| Body / Bonnet | A216 WCB/WCC, A352 LCC/LCB, A105, A350 LF2, A182 F316/F51/F53 |
| Ball | A105+ENP, A182 F316, F304, F51, Monel, Inconel |
| Seat | Soft Seat: PTFE, RPTFE, PEEK, DEVLON, NYLON <br> Metal Seat: Stellite Faced, Tungsten Carbide (WC) Coated |
| Stem | 13Cr, F316, 17-4PH, XM-19, F51, Inconel 718 |
| Seals / O-Rings | Viton (A/B/GLT), HNBR, NBR, Flexible Graphite |
API 6D Ball Valve Testing & Compliance
| Test Item | Reference Standards |
| Pressure Test | Mandatory per API 6D (High-pressure Hydrostatic & Low-pressure Air) |
| Leakage Criteria | Soft Seat: Rate A (Zero Leakage); Metal Seat: Per ISO 5208 |
| NDT Inspection | RT (Radiographic), UT (Ultrasonic), MT (Magnetic), PT (Penetrant) per PSL |
| Sour Service | Optional compliance with NACE MR0175 / ISO 15156 |
| Fugitive Emission | Optional compliance with ISO 15848 / API 622 / API 641 |
Technical Specification Tables: API 608 Metal Ball Valves
| Parameter | Description / Range |
| Design Standard | API 608 / ASME B16.34 |
| Nominal Size Range | NPS 1/2" ~ NPS 24" (DN 15 ~ DN 600) |
| Pressure Class | ASME Class 150, 300, 600, 800 (Threaded/SW only) |
| End Connections | Flanged (RF, RTJ), Butt-Weld (BW), Socket-Weld (SW), Threaded (NPT) |
| Construction Type | Floating Ball: Typical for NPS 8" and below <br> Trunnion Mounted: Typical for NPS 4" and above |
| Face to Face | Compliant with ASME B16.10 |
API 608 Ball Valve Common Materials (ASTM Standards)
| Component | Common Materials (ASTM) |
| Body / Bonnet | A216 WCB/WCC, A352 LCB/LCC, A105, A182 F316/F304, A351 CF8/CF8M |
| Ball | A182 F316, F304, SS316, SS304, F51, A105+ENP |
| Seat | Soft Seat: PTFE, RPTFE (Reinforced), PEEK, NYLON <br> Metal Seat: Metal-to-Metal (Stellite Faced or WC Coated) |
| Stem | 13Cr, F316, F304, 17-4PH, XM-19, F51 |
| Packing & Gaskets | Flexible Graphite (Fire safe preferred), PTFE, Viton |
API 608 Ball Valve Testing & Compliance
| Test Item | Reference Standards |
| Pressure Test | Compliant with API 598 (Includes Shell and Seat tests) |
| Leakage Criteria | Soft Seat: Zero leakage per API 598 requirements |
| Certification | EN 10204 3.1 or 3.2 Certificate |
| Sour Service | Optional compliance with NACE MR0175 / ISO 15156 |
| Visual Inspection | Compliant with MSS SP-55 |
API 6D VS API 608 Ball valve Comparison Summary Table
| Feature | API 6D Ball Valve | API 608 Ball Valve |
| Industry Segment | Midstream (Pipelines) | Downstream (Refinery/Petrochem) |
| Typical Design | Trunnion Mounted | Floating Ball |
| Pigging / Full Bore | Mandatory / Strict | Optional |
| Isolation | DBB / DIB Defined | Standard Shut-off |
| Common Sizes | 2" to 60" | 1/2" to 24" |
| Anti-Static | Required | Extremely Strict Design |
| Maintenance | Drain & Vent Plugs Standard | Not Required |
GNEE API 6D and API 608 Ball Valve factory
FAQ
What is an API 608 ball valve?
API 608 ball valves are essential components used in high-pressure applications, particularly in the petroleum, chemical, and petrochemical industries. These valves play a vital role in controlling the flow of gases and liquids within a piping system.
What is an API 6D ball valve?
API 6D ball valves are essential components in pipeline systems, particularly within the oil and gas industry. They are designed to control the flow of fluids and gases, ensuring the safe and efficient operation of pipelines.