API 602 is the core standard for DN100 (4 inches) and below gate valves, globe valves, and check valves in the oil and gas industry, covering materials from carbon steel to duplex stainless steel. The API623 standard is applicable to needle valves used under high temperature (over 1000 ° F or 538℃) and high pressure (over 2500psi or 17.2 MPa) conditions.
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API 602 Globe Valve Technical Parameters
| Feature | Specification / Requirement |
| Manufacturing Method | Forged Steel (A105, F316, F11, F22) |
| Size Range | NPS 1/4" to NPS 4" (DN 8 to DN 100) |
| Pressure Classes | Class 150, 300, 600, 800, 1500, 2500 |
| Standard Design | Bolted Bonnet (BB) or Welded Bonnet (WB) |
| Testing Standard | API 598 (Valve Inspection and Testing) |
| Common Trim | Trim #8 (13Cr/Stellite) |
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API 623 Globe Valve Technical Parameters
| Feature | Specification / Requirement |
| Manufacturing Method | Cast Steel (WCB, LCC, CF8M, WC6, WC9) |
| Size Range | NPS 2" to NPS 24" (DN 50 to DN 600) |
| Pressure Classes | Class 150, 300, 600, 900, 1500, 2500 |
| Standard Design | Bolted Bonnet (BB) / Pressure Seal Bonnet (PSB) |
| Mandatory Requirement | Stellite-faced seats and guided discs |
| Testing Standard | API 598 |
Technical Comparison: API 623 vs. API 602
| Feature | API 602 (Small-Bore Forged) | API 623 (Large-Bore Cast) |
| Standard Name | Steel Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller | Cast Steel Globe Valves-Flanged and Butt-welding Ends |
| Manufacturing Process | Forged Steel | Cast Steel |
| Size Range | NPS 1/4" to 4" (DN 8 to DN 100) | NPS 2" to 24" (DN 50 to DN 600) |
| Pressure Class | Class 150, 300, 600, 800, 1500, 2500 | Class 150, 300, 600, 900, 1500, 2500 |
| Valve Types Covered | Gate, Globe, and Check Valves | Globe Valves Only |
| End Connections | SW, NPT, Flanged, BW | Flanged (RF, RTJ), Butt-Weld (BW) |
| Bonnet Design | Bolted Bonnet (BB), Welded Bonnet (WB) | Bolted Bonnet (BB), Pressure Seal Bonnet (PSB) |
| Design Focus | Compactness, high-pressure strength, thermal shock resistance | Anti-vibration, seat hardness, high-flow regulation |
| Testing Standard | API 598 | API 598 |
Material and Trim Comparison
| Part Name | API 602 Typical Materials | API 623 Typical Materials |
| Body Material | ASTM A105, F316, LF2, F11, F22 | ASTM A216 WCB, CF8M, LCC, WC6, WC9 |
| Standard Trim | Usually API Trim #8 (13Cr/Stellite) | Mandated Hardfaced Seating (Stellite) |
| Stem | 13Cr (F6a) or Stainless Steel | Reinforced Diameter for high-vibration service |
| Seat | Integral or Welded Seat Ring | Must be Stellite Hardfaced Overlay |
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FAQ
What is the difference between BS 1873 and API 623?
The main difference between the two standards is that BS 1873 standard includes valves with a diameter of 2 "or less, while API 623 standard does not include small diameter valves with a diameter of 2" or less in the standard scope, and only expands the diameter on medium and low pressure valve specifications.
API 623 VS API 600
API 600 and API 623 are both American Petroleum Institute standards for steel valves in the oil and gas industry, but they cover different valve types. API 600 is the standard for heavy-duty bolted bonnet gate valves, while API 623 is specific to heavy-duty globe valves. API 623 was developed to provide specialized design guidelines for globe valves that were previously, and often incorrectly, ordered under the API 600 gate valve standard.