What Are The Differences Between ANSI Valves And ISO Valves?

The core differences between ANSI and ISO valves are their standard systems, design priorities, application scenarios and interchangeability, as follows:
I. Standard System and Developing agencies
ANSI Valves: Follow standards set by the American National Standards Institute (ANSI), the American Society of Mechanical Engineers (ASME), and the American Petroleum Institute (API), such as ANSI B16.5 (flange dimensions), ASME B16.34 (pressure temperature rating), and API 6D (line valves). These standards are primarily developed in the United States and reflect the needs of North American industry.
ISO valves: conform to globally applicable standards established by the International Organization for Standardization (ISO ISO), such as ISO 5208 (pressure testing), ISO 5752 (structural length) and ISO 10434 (oil and gas steel gate valves). The International Organization for Standardization standards were developed jointly by representatives of several countries, emphasizing international compatibility.
ii. Design Focus and Technical Requirements
ANSI Valves:
Pressure and temperature Ratingss: use grade grades (e.g. 150 / 300) in high temperature and pressure situations (e.g. petrochemicals), plus marking methods related to materials and structures. Flange Dimensions: If there is a discrepancy with GB, Install compatibility must be considered.
Material Requirements: There are detailed requirements for corrosion resistant and high temperature resistant materials, for example, API standards have strict requirements for valve materials.
Inspection and testing: Mandatory third-party testing is required to ensure compliance with API/ASME standards.
ISO Valves: Pressure and Temperature Rating: PN rating (e.g. PN16/40), directly related to nominal pressure, applicable to multi-country projects.
Structure length: Standardization in accordance with ISO 5752 and other standards to facilitate component exchange between different manufacturers.
Material Requirements: High flexibility in line with the development of global material production capacity.
Testing: Flexibility to adjust testing methods to project needs. Third-party testing is not mandatory.
III. Application Scenarios and Interchangeability
ANSI Valves:
Main applications: North American equipment integration, overseas engineering, high-end industrial sectors (e.g. oil, gas, oil and gas transportation, etc.).
Interchangeability: Not compatible with GB, JIS and other standard flanges, adapters are required.
ISO Valves:
Main uses: Multinational collaborative projects requiring programmes compatible with different equipment systems (e.g. European and Asian markets). Interchangeability: The design emphasizes versatility and is partially compliant with DIN, EN and other standards, reducing global procurement costs.
IV. INTRODUCTION INTRODUCTION Typical case comparison
ANSI Valve Case:
API 600 Steel Gate Valve: A class 600 high pressure pipeline made of corrosion-resistant alloys for petrochemical industry that has been rigorously tested in accordance with API 598 requirements.
ANSI B16.5 Flange: ASMEB B16.47 large-size flanges covering 1 / 2 inch to 60 inch pipe connections.
ISO valve housing:
ISO 10434 steel ball valve: for multi-country oil and gas pipelines, PN100 class, construction length ISO 5752, interchangeable with DIN flanges.
ISO 5211 Actuator Interface: Standardized Connect-Size pneumatic/electric actuator connection dimensions for easy integration into automation systems.