The core differences between API 600 and API 602 gate valves are mainly reflected in the scope of application, structural design and process standards, as follows:
1. Scope of application and pressure level
API 600
Mainly for gate valves with larger diameters (usually DN65 and above), covering all pressure levels (such as Class 150-2500), suitable for conventional high-pressure scenarios in industries such as petroleum and chemical industry.
API 602
Designed for compact gate valves (usually DN50 and below), with a narrower pressure level range (such as Class 800 and below), but more flexible material selection, suitable for high pressure, high temperature or fine working conditions requiring reduced diameter design.
2. Process and structural characteristics
Manufacturing process
API 600 gate valves are mainly made of casting technology, and the valve body is mostly made of cast steel (such as WCB, CF8, etc.), focusing on versatility and durability;
API 602 gate valves are made of forging technology, and the valve body is lighter and stronger (such as A105 forged steel), suitable for frequent opening and closing or corrosive media environments.
Structural design
API 600 gate valves have a relatively standardized structure, emphasizing full-bore flow capacity, and are suitable for pipelines without reduction requirements;
API 602 gate valves are mostly designed with reduced necks (the valve body flow channel diameter is smaller than the pipeline), which saves space and is suitable for high-pressure difference scenarios. Some models support bolted valve covers (BB-BG) to simplify maintenance.
3. Material and Sealing Performance
Material Coverage
API 600 has fewer material options, usually standard carbon steel or stainless steel (such as WCB, CF8M);
API 602 allows the use of more special materials (such as F5, F11 and other alloy steels), compatible with corrosive media or extreme temperature conditions.
Sealing and Testing
API 600 follows the API 598 standard test, and its sealing performance meets conventional industrial needs;
Although API 602 is also tested according to API 598, it has more advantages in high-pressure micro-leakage control due to its forging process and elastic sealing design.
4. Differences in Application Scenarios
API 600
Applicable to large-diameter systems that require long-term stable operation, such as large refineries and long-distance pipelines, typical scenarios such as main process shut-off valves or tank outlet control.
API 602
It is mostly used for high-pressure points with limited space, such as instrument root valves, equipment inlets and outlets, and performs particularly well in scenarios that require frequent maintenance or fine control of media containing particles (such as Class 800 high-pressure steam systems).
5. Selection Recommendations
API 600 is preferred: general industrial scenarios with large diameter, full pressure level coverage and clean media; API 602 is preferred: small diameter, high pressure difference, special material requirements or complex working conditions that require compact installation.