API 602 is the American Petroleum Institute standard for compact steel gate, globe and check valves for small size and usually they are up to NPS 2 inch only. It sets requirements for body wall thickness, stem size, backseat design and testing. This makes API 602 valves the standard choice for small-bore process, instrument and utility lines in refining, petrochemical, oil & gas, power and chemical plants.
Shinjo's API 602 series covers forged steel gate, globe and check valves in NPS ½"–2" (DN15–DN50), Class 150 to 2500, with pressure-temperature ratings to ASME B16.34. Forged bodies are free from casting defects such as porosity and shrinkage, giving higher strength for high-pressure, high-temperature and cyclic service. Every valve is tested to API 598 before shipment.
On/off isolation with low pressure drop.
- Bolted bonnet, Class 150–1500
- Pressure-seal bonnet, Class 900–2500
Throttling and frequent operation.
- Bolted bonnet, Class 150–1500
- Pressure-seal bonnet, Class 900–2500
Automatic backflow prevention.
- Piston, swing and Y-type
- Bolted bonnet, Class 150–1500
- Pressure-seal bonnet, Class 900–2500
| Standard | API 602, ASME B16.34 |
| Size | NPS ½"–2" (DN15–DN50) |
| Pressure class | Class 150–2500, including Class 800 |
| Ends | Socket weld, butt weld, NPT/BSPT threaded, RF/RTJ flanged |
| Body material | A105N, A350 LF2, F11, F22, F304/F304L, F316/F316L; other alloys on request |
| Trim | API Trim 8 (standard), 5, 10, 12, 16 |
| Operation | Handwheel, pneumatic, electric |
| Testing & documents | API 598; EN 10204 3.1 certificates |
| Options | NACE MR0175, low-emission packing, bellows seal, third-party inspection |
Instrument root valves, sampling and drain lines, chemical injection, steam trap and bypass stations, and high-pressure skid piping.
Class 800 is an intermediate pressure rating between Class 600 and Class 900. ASME B16.34 allows it for socket-weld, threaded and butt-weld valves. For A105, it is rated at about 1,975 psi (136 bar) at ambient temperature. That covers most small-bore process and utility lines, so it is the default rating for forged valves.
Bolted bonnets are easy to open for maintenance and are the standard choice up to Class 1500. Pressure-seal bonnets use line pressure to tighten the body-bonnet seal. This makes them the usual choice for high-pressure steam and other services from Class 900 to 2500.
Send us the valve type, size, pressure class, end connection, material and quantity, or simply your datasheet. Our engineers will recommend the right configuration.