GB7512-2023

Valves for liquefied petroleum gas cylinders

液化石油气瓶阀

GB 7512-2023 est une norme nationale chinoise obligatoire en vigueur : Valves for liquefied petroleum gas cylinders. Secteur : Machines. Thème principal : Sécurité des produits. Entrée en vigueur : 1 déc. 2023.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

This standard applies to valves for liquefied petroleum gas (LPG) cylinders designed for operating environments ranging from -40°C to +60°C, with a nominal working pressure not exceeding 2.5 MPa. It specifically covers LPG cylinder valves where the centerlines of the inlet and outlet form a 90° angle. This standard explicitly excludes valves used for automotive LPG cylinders. It is highly relevant for manufacturers of LPG storage and distribution equipment, including components like gas phase valves and liquid phase valves.

Exigences techniques

The standard specifies comprehensive material, structural, and performance requirements for LPG cylinder valves. For materials, it mandates the use of specific metal alloys like lead brass HPb59-1 for main components, and sets strict criteria for non-metallic sealing components, including rubber O-rings, regarding aging resistance, low-temperature performance, and medium compatibility. Structurally, the standard dictates that valves must utilize a non-detachable design to prevent unsafe reassembly after disassembly. Manufacturers must ensure sealing structures remain effective throughout the minimum design service life, which must exceed the cylinder's periodic inspection cycle. Performance-wise, the standard outlines critical operational limits. Valves must demonstrate reliable opening and closing torque, stringent gas tightness (leakage rates), and durability under vibration and extreme temperatures. A significant update in this version is the introduction of requirements for information valves and intelligent valves. These advanced valve types must integrate electronic reading marks (like QR codes) for traceability and may include authorized filling devices to prevent unauthorized gas filling. Gas phase valves are now required to be equipped with a self-closing device or an overflow cutoff device.

Méthodes d’essai

The standard outlines a rigorous suite of testing methods to validate compliance. Key tests include the air tightness test (requiring automated data collection and recording), vibration resistance test, and temperature resistance test under extreme environmental conditions. It also details durability tests for both the main valve body (subjected to 30,000 open/close cycles) and the self-closing device (2,000 cycles). For structural integrity, tests like the valve body pressure resistance test and stress corrosion resistance test using an ammonia atmosphere are mandated. Intelligent valves must undergo additional testing for their electronic components and authorized filling performance.

Questions fréquentes

What products are regulated under GB 7512-2023?

This standard applies to liquefied petroleum gas cylinder valves with an ambient temperature range of -40°C to +60°C, a nominal working pressure ≤2.5MPa, and an inlet/outlet centerline angle of 90°. It explicitly excludes valves for automotive LPG cylinders.

Are there any updates from the previous version of GB 7512?

The 2023 version is a mandatory standard (upgraded from the previous recommended GB/T). Key updates include the addition of terms for information valves and intelligent valves, new requirements for overcurrent cutoff devices, updated inlet thread specifications (removing PZ19.2 and adding M26×1.5), and mandatory electronic reading marks for traceability.

How does GB 7512-2023 differ from ISO standards?

While it shares similarities with international gas cylinder valve standards, GB 7512-2023 is tailored specifically for the Chinese LPG market. It includes unique requirements for digital traceability and intelligent authorized filling systems that are not typically found in standard ISO frameworks.

The summary above provides a high-level overview of GB 7512-2023. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 7512-2023 today to access all detailed parameters, tables, and testing procedures.

Indications d’applicabilité

Type: Produit
CCS: J16
ICS: 23.020.30
Autorité compétente: State Administration for Market Regulation
Comité technique: National Technical Committee on Gas Cylinders of Standardization Administration of China

Relations

Remplace:GB/T 7512-2017