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Valve standards are the foundation of global industrial pipeline safety and performance. They ensure that valves across manufacturers, countries, and industries are compatible, safe, and reliable. However, many engineers and procurement professionals find the maze of API, ANSI, ISO, PN, and JIS ratings complex to navigate.
At Gangye, we manufacture valves that comply with multiple international standards, including API 600, ANSI B16.34, ISO 5208, and PN-rated systems, ensuring seamless integration into your project. This guide breaks down the most common valve standards, how they differ, and how to choose the right one for your system.
Standards ensure that:
Valves fit properly with pipes and flanges
Pressure and temperature limits are known and safe
Testing procedures and quality control are consistent
Cross-border projects use interoperable components
Without clear standards, the risk of leakage, rupture, or costly downtime increases significantly.
API (American Petroleum Institute) standards are essential for the oil, gas, and petrochemical industries. Some common API standards include:
API 600 – Steel gate valves, bolted bonnet
API 598 – Valve inspection and testing
API 6D – Pipeline valves (including ball, gate, check valves)
API 607 – Fire-safe testing for valves
Valves conforming to API are rigorously tested for safety, pressure resistance, and durability.
Gangye, as a professional industrial valve manufacturer, produces API-compliant gate, globe, and check valves used in oil & gas pipelines across Asia, the Middle East, and South America.
Often used interchangeably, ANSI (American National Standards Institute) and ASME (American Society of Mechanical Engineers) relate to dimensional and pressure class standards.
ANSI/ASME B16.34 – Covers pressure-temperature ratings, materials, dimensions, and testing
Pressure Classes include: Class 150, 300, 600, 900, 1500, and 2500
Flange standards often refer to ASME B16.5
Key Concept:
Class 150 valves are suitable for lower pressure (~285 psi at 100°F)
Class 600+ is for high-pressure systems such as steam or petrochemicals
ISO (International Organization for Standardization) provides globally harmonized quality and testing frameworks:
ISO 5208 – Valve pressure testing procedures
ISO 5211 – Dimensions for valve actuator attachments
ISO 9001 – Quality management system
Gangye's factory is ISO 9001 certified, and products are tested per ISO 5208 pressure testing protocols for leak-tight performance and durability.
PN (Pressure Nominal) ratings are widely used in Europe, China, and other metric-standard countries. They define the pressure capacity of the valve in bars.
PN Rating | Max Pressure (bar) | Approx PSI |
PN10 | 10 bar | 145 psi |
PN16 | 16 bar | 232 psi |
PN25 | 25 bar | 362 psi |
PN40 | 40 bar | 580 psi |
PN valves are commonly used in:
Water supply and wastewater systems
Municipal pipelines
Industrial cooling/heating systems
Gangye provides PN10–PN100 rated valves for civil and industrial projects.
Feature | API | ANSI / ASME | ISO | PN (EN/DIN) |
Region of Use | USA / Global (Oil & Gas) | USA / Global (General) | Global | Europe / China |
Pressure Units | psi / Class | psi / Class | bar / global | bar (metric) |
Common Classes | API 600, 6D, 598 | Class 150–2500 | ISO 5208, ISO 5211 | PN10–PN100 |
Application | Petrochemical, Oil & Gas | Industrial, Chemical | Testing, Quality, Design | Water, HVAC, General |
At Gangye, we uphold the highest international manufacturing standards:
API 600, 6D-compliant gate, globe, and check valves
ANSI/ASME B16.34 pressure class valves
ISO 9001-certified production lines
PN-rated valves with full hydrostatic testing
Non-destructive testing (NDT), UT, MT available
Full test certificates and quality traceability
Our valves are trusted by China Huadian, Shenhua, CITIC, and other major EPC contractors across the energy and infrastructure sectors.
1. What is the difference between API and ANSI valves?
API valves are specifically designed for oil & gas applications and undergo more rigorous testing (e.g. fire-safe, fugitive emission). ANSI valves are more general-purpose but critical in chemical, water, and industrial systems.
2. Can I mix ANSI and PN rated valves in the same system?
It's technically possible with the right flange adapters, but not recommended due to pressure rating mismatches. Always match your pipeline standard for consistency and safety.
3. Are PN-rated valves suitable for high-pressure systems?
PN-rated valves can go up to PN100 (≈1450 psi), which is sufficient for many industrial applications. For very high-pressure or high-temperature conditions, consider ANSI Class 600 or above.
4. Does Gangye support custom valve certifications?
Yes. Gangye provides material traceability reports, hydrostatic testing certificates, API/ISO test reports, and third-party inspection options upon request.
Navigating valve standards doesn't have to be overwhelming. Whether you're working with API gate valves for oil pipelines, ANSI globe valves for power plants, or PN-rated valves for water systems, knowing the standards ensures performance, compliance, and longevity.
At Gangye, we offer a full range of standard-compliant valves, engineered with precision and tested for reliability.
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