API608 is a metal ball valve specification developed by the American Petroleum Institute, focusing on flange, threaded, and welded end metal ball valves, covering more than Class 150 to Class 1500 pressure levels, suitable for temperatures ranging from -28 ℃ to 300 ℃, emphasizing fire and anti-static design! The materials include carbon steel, stainless steel, and alloy steel. The valve seat seal has metal hard seal and PTFE soft seal options, and is compatible with ASME standards.
Reliable API 608 Process Ball Valves for Refineries, Petrochemical & Chemical Plants.
Technical Specifications for API 608 Ball Valves
| Category | Standards & Description |
| Design Standard | API 608 (Metal Ball Valves-Flanged, Threaded, and Welding Ends) |
| Pressure-Temperature (P-T) Rating | ASME B16.34 |
| Face-to-Face (F-F) Dimensions | ASME B16.10 |
| Pressure Rating | Class 150, 300, 600, 800 (Forged) |
| Size Range | NPS 1/2" to 24" (DN 15 to DN 600) |
| End Connections | Flanged (RF, RTJ), Butt-Weld (BW), Socket-Weld (SW), Threaded (NPT) |
| Inspection & Testing | API 598 (Valve Inspection and Testing) |
| Fire Safe Design | API 607 / API 6FA |
| Fugitive Emission Control | API 622 / API 641 |
| Operation / Actuation | Lever (Handle), Gear Operator, Electric/Pneumatic Actuators |
Common Material Specifications
| Part Name | Carbon Steel | Stainless Steel | Low Temperature Steel |
| Body / Bonnet | A216 WCB / A105 | A351 CF8M / F316 | A352 LCC / LF2 |
| Ball | A105 + ENP / F304 | F316 / CF8M | F316 / SS316 |
| Stem | A182 F6a / F304 | A182 F316 / 17-4PH | A182 F316 |
| Seat | PTFE / RPTFE / Devlon | RPTFE / PEEK / Metal Seat | Devlon / Kel-F (PCTFE) |
| Packing | Flexible Graphite | PTFE / Flexible Graphite | Flexible Graphite |
| Gasket | SS304 + Graphite | SS316 + Graphite | SS316 + Graphite |
API 608 vs. API 6D Comparison
| Feature | API 608 (Process Valves) | API 6D (Pipeline Valves) |
| Primary Application | Petrochemical & Chemical Plants | Long-Distance Pipelines |
| Service Type | High-cycle, Process Piping | Isolation, Midstream Transport |
| Size Range | Typically NPS 1/2" to 24" | NPS 2" to 60"+ |
| Testing Focus | Fugitive Emissions & Seat Leakage | DBB (Double Block & Bleed) |
| Wall Thickness | Per ASME B16.34 | API 6D Specific (Thicker) |
| Pigging | Generally Not Required | Must be Piggable (Full Bore) |
API 608 Ball Valve Dimension Chart
Class 150 (PN 20)
| NPS | DN | L (F-F) | H (Approx. Open) | W (Lever/Handwheel) | Weight (kg) |
| 1/2" | 15 | 108 | 85 | 130 | 2.5 |
| 3/4" | 20 | 117 | 95 | 130 | 3.5 |
| 1" | 25 | 127 | 105 | 160 | 5.0 |
| 1-1/2" | 40 | 165 | 135 | 230 | 9.0 |
| 2" | 50 | 178 | 155 | 230 | 13 |
| 2-1/2" | 65 | 191 | 175 | 400 | 19 |
| 3" | 80 | 203 | 190 | 400 | 25 |
| 4" | 100 | 229 | 235 | 450 | 42 |
| 6" | 150 | 394 | 320 | 800 (Gear) | 88 |
| 8" | 200 | 457 | 410 | Gear Operator | 155 |
Class 300 (PN 50)
| NPS | DN | L (F-F) | H (Approx. Open) | W (Lever/Handwheel) | Weight (kg) |
| 1/2" | 15 | 140 | 90 | 130 | 4.0 |
| 3/4" | 20 | 152 | 100 | 160 | 5.5 |
| 1" | 25 | 165 | 115 | 160 | 8.0 |
| 1-1/2" | 40 | 190 | 145 | 230 | 14 |
| 2" | 50 | 216 | 165 | 400 | 20 |
| 3" | 80 | 283 | 210 | 450 | 40 |
| 4" | 100 | 305 | 255 | 800 (Gear) | 65 |
| 6" | 150 | 403 | 360 | Gear Operator | 135 |
| 8" | 200 | 502 | 450 | Gear Operator | 245 |
Class 600 (PN 110)
| NPS | DN | L (F-F) | H (Approx. Open) | W (Lever/Handwheel) | Weight (kg) |
| 1/2" | 15 | 165 | 100 | 160 | 6.5 |
| 3/4" | 20 | 190 | 110 | 160 | 8.5 |
| 1" | 25 | 216 | 125 | 230 | 12 |
| 1-1/2" | 40 | 241 | 155 | 400 | 22 |
| 2" | 50 | 292 | 185 | 450 | 35 |
| 3" | 80 | 356 | 240 | 800 (Gear) | 68 |
| 4" | 100 | 432 | 300 | Gear Operator | 115 |
| 6" | 150 | 559 | 420 | Gear Operator | 260 |
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FAQ
What is the difference between API 608 and API 6D ball valve?
In simple terms, API 6D governs ball valves used in pipelines, focusing on large-scale flow isolation and transmission safety, while API 608 applies to ball valves used in process piping, where precise flow control and compact design are key.
What is the difference between API 608 and API 607?
API 607 is essential for environments where fire safety is a top priority, ensuring valves can withstand and function during fire exposure. In contrast, API 608 focuses on the structural integrity and performance of metal ball valves under pressure and temperature without addressing fire resistance.