API 602 globe valve Description
API 602 globe valve is an industrial valve designed according to the American Petroleum Institute (API) standard. It is specially developed for high-pressure and small-diameter (DN≤100) working conditions and is suitable for harsh industrial scenarios such as oil and natural gas.
Advantages
High reliability seal
Adopting metal hard seal + soft seal composite design, leakage rate ≤ 0.01% × DN (API 598 standard verification);
The integrated structure of valve disc and valve stem (such as needle-type globe valve) improves the opening and closing accuracy and sealing durability.
Resistant to extreme working conditions
The valve seat with cladding carbide can withstand the erosion of solid particles and coking media (such as alumina production process pipeline);
The forged steel valve body can withstand the corrosion of high-pressure steam (thermal/nuclear power main steam system) or acidic oil and gas environment.
Maintenance convenience
The split valve body design (some models) supports quick replacement of sealing components to reduce downtime.
API 602 globe valve Specification
Compact structure: Compared with ordinary globe valves (such as BS 1873), the structural length of API 602 valve is shortened by about 30%, saving installation space;
Material requirements: The valve body is made of carbon steel (ASTM A216/WCB), stainless steel (A351 CF8M) or bronze, and the sealing surface is welded with Stellite carbide or PTFE to enhance the sealing;
Connection method: Support flange, threaded or welded connection to meet different pipeline interface requirements;
Pressure and temperature: The highest pressure level reaches Class 2500 (PN420), and the applicable temperature range is -29℃ to 538℃.
API 602 globe valve
Key differences from other globe valves
Structural design comparison
API 602 valves : Compulsory to compact structure (API 602 standard), valve body length is shorter than ordinary globe valves (such as GB/T 12235); Direct flow stop valve : The flow channel is designed as a straight line, with low flow resistance but weak pressure bearing capacity (≤PN160). Performance parameter differences
Sealing level : API 602 valves need to pass a two-way gas sealing test (ISO 5208 Class A), while ordinary globe valves only need a one-way test (Class B); Pressure resistance : API 602 supports Class 2500 (42MPa), while angle stop valves are usually limited to Class 600 and below. Materials and Process
API 602 valve: valve stem surface nitriding treatment, valve seat welded with hard alloy (such as Stellite 6), common globe valves mostly use soft seals (rubber/PTFE); Bellows stop valve: zero leakage is achieved through metal bellows, but the cost is higher than API 602 valve.
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