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GB / T 19672-2005 "pipeline valve technical conditions"
GB/T 19672 is a Chinese standard that adopts and modifies ISO 14313:1999 "Oil and Gas Industry – Pipeline Transportation System – Pipeline Valves" and API 6D:2002 "Pipeline Valves." It outlines the specifications for gate valves, ball valves, check valves, and plug valves with flange and welding connections. The standard covers terminology, structural types, dimensions, ordering requirements, technical specifications, materials, inspection rules, testing methods, and marking. It applies to natural gas and oil pipelines with nominal pressure ranging from PN16 to PN420 and nominal sizes from DN15 to DN1200.
Compared to ISO 14313 and API 6D, GB/T 19672 has several key differences. First, it follows the format specified in GB/T 1.1-2000, which differs from the international standards. Second, some terms and definitions are adapted or rephrased to suit local usage. Third, it adds new nominal pressures such as PN16, PN25, and PN40. Fourth, the ordering requirements have been modified. Fifth, it includes larger structural lengths for ball valves over DN1000. Sixth, it increases the requirements for valve body connection bolt threads. Seventh, it incorporates China’s specific regulations on welding and inspection. Eighth, it provides detailed inspection rules for valves.
The main technical content of GB/T 19672 includes explanations of key terms such as full-bore valves, reduced-bore valves, shrink valves, one-way valves, two-way valves, and locking devices to ensure accurate application of the standard. It also describes typical structures and connection types for gate, ball, plug, and check valves used in long-distance pipelines. The pressure-temperature rating and material selection for valve bodies align with GB 9131, ensuring compatibility with existing industry practices.
The structural length of the valves follows API 6D requirements, facilitating interchangeability between different manufacturers. For valves with one end welded and the other flanged, specific length requirements are defined. The standard also clarifies the representation of flow paths, specifying both the nominal size and actual bore diameter. This helps distinguish between full-bore and reduced-bore valves.
To meet long-distance pipeline cleaning and maintenance needs, the standard specifies minimum bore sizes and regulates the cross-sectional shape of the flow path. It also sets structural requirements for performance and operational characteristics, including operating torque and functionality. Material specifications include commonly used valve body materials, corrosion resistance measures, hardness requirements, and welding procedures.
Testing procedures are based on API 6D, covering all necessary inspections, test durations, and methods. The standard was developed by the National Valve Standardization Technical Committee (SAC/TC188) and came into effect on August 1, 2005. It serves as a critical reference for valve design, manufacturing, and application in China's oil and gas industry.