The ISO standard system for globe valves covers design, testing and supporting specifications. The core standards are as follows:
1. Core design standards
ISO 15761
Scope of application: Structural design, material selection and manufacturing requirements of metal globe valves, suitable for fully open/fully closed working conditions in industrial scenarios such as petroleum and chemical industries.
Technical points:
Define the matching rules of valve nominal size (DN15~DN400) and pressure level (PN16~PN420);
Forced sealing structure design requires the hardness difference between the valve disc and the valve seat contact surface to be ≥50HB.
ISO 5208
Functional positioning: General test method for valve sealing performance, suitable for leakage rate verification of globe valves and other types of valves.
Key indicators:
Sealing levels are divided into Class A to Class G (maximum leakage rate ≤10^-6 mL/s);
Including low-pressure air tightness test (≤0.6MPa) and high-pressure water pressure test (1.5 times the nominal pressure).
2. Supporting standards
ISO 5752
Content: Specifies the structural length (face-to-face dimension) of metal valves to ensure the installation compatibility of globe valves of different brands. For example, the structural length of DN50 valves is unified as 250mm±1.5mm.
ISO 7005
Content: Metal flange connection standard, defines the flange end dimensions, sealing surface type (such as RF convex surface, FF full plane) and pressure and temperature ratings of globe valves, and is suitable for PN16~PN400 working conditions.
3. Application scenarios and expansion
Industrial adaptation: ISO 15761 and ISO 5208 are combined and applied to cover the whole life cycle control of globe valves from design and manufacturing to sealing performance testing.
Cross-regional compatibility: ISO standards have technical interoperability with API, EN and other specifications (such as API 598 sealing test is equivalent to ISO 5208).
Summary: The ISO core standards for globe valves are ISO 15761 (design) and ISO 5208 (testing), which are accompanied by specifications for structural length (ISO 5752) and flange connection (ISO 7005), forming a complete international standardization system.
