The ISO standard system for check valves mainly includes the following core specifications, which are classified by application field as follows:
I. Core product standards
ISO 15761:2002
Scope: Steel gate valves, stop valves and check valves with DN≤100 (NPS≤4) for the oil and gas industry, covering design, material and test requirements.
Key requirements:
Pressure levels cover Class 150~1500;
Mandatory performance tests include forward flow resistance and reverse sealing (leakage ≤ISO 5208 standard allowable value).
ISO 28921-1:2022
Scope: Industrial valves (including check valves) with metal valve bodies, nominal sizes DN10~DN1800 (NPS ⅜~72), pressure levels PN16~PN400.
New regulations: Special requirements for the toughness of valve materials and sealing structures under low temperature conditions.
2. Supporting test standards
ISO 5208:2015
Content: Valve sealing performance classification (A~G grade) and test methods, applicable to check valve reverse sealing verification.
Leakage benchmark: Class IV level allowable leakage ≤0.1%×valve seat diameter (DN).
ISO 10497:2004
Content: Valve fire resistance test specification, requiring check valves to maintain pressure-bearing function for 30 minutes in 650℃ open flame.
3. Special system standards
ISO 15500-3:2001
Application area: Check valves for compressed natural gas (CNG) fuel systems for vehicles, emphasizing vibration resistance and instantaneous high-pressure locking capabilities.
ISO 5781:2000
Application area: The assembly surface dimensions of check valves in hydraulic transmission systems are unified, compatible with the American standard SAE J518.
ISO 9952:1993
Application area: Check valves for agricultural irrigation systems, focusing on anti-siltation design and low opening pressure (≤0.2 bar)
