API 602 standard, specifically designed for small caliber (≤ DN100) steel gate valves, globe valves, and check valves, suitable for industries such as petroleum, natural gas, and chemical, especially for space tight occasions such as offshore platforms and modular factories
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Technical Specifications for API 602 Forged Steel Valves
| Category | Standards & Description |
| Design Standard | API 602 (Small Forged Steel Gate, Globe, and Check Valves) |
| Pressure-Temperature (P-T) Rating | ASME B16.34 |
| Pressure Rating | Class 150, 300, 600, 800, 1500, 2500 |
| Size Range | NPS 1/4" to 4" (DN 8 to DN 100) |
| Valve Types | Gate, Globe, and Check Valves |
| End Connections | Socket Weld (SW), Threaded (NPT), Butt Weld (BW), Flanged (RF, RTJ) |
| Inspection & Testing | API 598 (Valve Inspection and Testing) |
| Bonnet Design | Bolted Bonnet (BB), Welded Bonnet (WB), Pressure Seal Bonnet (PSB) |
| Fire Safe Design | API 607 / API 6FA (Applicable to Gate Valves) |
Material Specifications for API 602 Forged Steel Valves
| Part Name | Carbon Steel | Stainless Steel | Alloy Steel |
| Body / Bonnet | ASTM A105 | A182 F316 / F304 | A182 F11 / F22 / F91 |
| Wedge / Disc | A182 F6a / A105 + 13Cr | A182 F316 / F304 | A182 F11 + Stellite Overlay |
| Seat Ring | A182 F6a + Stellite | A182 F316 + Stellite | A182 F22 + Stellite |
| Stem | A182 F6a (13Cr) | A182 F316 / F304 | A182 F6a / F316 |
| Standard Trim | API Trim #8 (13Cr/Stellite) | API Trim #10 (SS316) | API Trim #5 (Full Stellite) |
| Packing | Flexible Graphite | PTFE / Graphite | Flexible Graphite |
Class 800 Forged Steel Gate Valves (NPT / SW Ends)
| NPS | DN | L (Face-to-Face) | H (Open Height) | W (Handwheel Ø) | Weight (kg) |
| 1/2" | 15 | 79 | 161 | 100 | 2.3 |
| 3/4" | 20 | 92 | 163 | 100 | 2.5 |
| 1" | 25 | 111 | 196 | 125 | 4.3 |
| 1-1/4" | 32 | 120 | 223 | 160 | 6.0 |
| 1-1/2" | 40 | 120 | 251 | 160 | 7.5 |
| 2" | 50 | 140 | 290 | 180 | 11.5 |
| 3" | 80 | 210 | 433 | 240 | 22.0 |
Class 800 Forged Steel Globe Valves (NPT / SW Ends)
| NPS | DN | L (Face-to-Face) | H (Open Height) | W (Handwheel Ø) | Weight (kg) |
| 1/2" | 15 | 79 | 163 | 100 | 2.4 |
| 3/4" | 20 | 92 | 165 | 100 | 2.6 |
| 1" | 25 | 111 | 198 | 125 | 4.5 |
| 1-1/2" | 40 | 155 | 255 | 160 | 8.2 |
| 2" | 50 | 172 | 295 | 180 | 12.5 |
Class 800 Forged Steel Check Valves (NPT / SW Ends)
| NPS | DN | L (Face-to-Face) | H (Center-to-Top) | Weight (kg) |
| 1/2" | 15 | 79 | 52 | 1.5 |
| 3/4" | 20 | 92 | 55 | 1.8 |
| 1" | 25 | 111 | 68 | 2.8 |
| 1-1/2" | 40 | 155 | 98 | 5.5 |
| 2" | 50 | 172 | 115 | 8.5 |
API 602 (Forged) vs. API 600 (Cast) Standard Comparison
| Feature | API 602 (Small Bore) | API 600 (Large Bore) |
| Manufacturing Method | Forged Steel (Higher density/strength) | Cast Steel (Lower cost for large sizes) |
| Size Range | NPS 1/4" to NPS 4" | NPS 2" to NPS 60"+ |
| Pressure Classes | Class 150, 300, 600, 800, 1500, 2500 | Class 150, 300, 600, 900, 1500, 2500 |
| Valve Types | Gate, Globe, Check | Gate (Primary) |
| Testing Standard | API 598 | API 598 / API 600 Specifics |
| Common Materials | A105, F316, LF2, F11, F22 | WCB, CF8M, LCC, WC6, WC9 |
API 602 vs. API 600: Which One Saves You 20% on Your Small-Bore Project?
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FAQ
What is API 602 standard?
This standard specifies the requirements for a series of compact gate, globe and check valves for petroleum and natural gas industry applications.
What is API 600 vs API 602 vs API 603?
Below is a summary of each API standard and its applications: API 600: Heavy-duty gate valve standard for high-pressure environments. API 603: Lightweight gate valve standard for low to medium pressure with corrosion resistance. API 602: Small-diameter gate valve standard for narrow piping systems.