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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 and API 6D:2002, specifically for pipeline valves in the oil and gas industry. This standard outlines the technical specifications for gate valves, ball valves, check valves, and plug valves with flange and welding connections. It covers terminology, structural types, parameters, ordering requirements, technical specifications, materials, inspection rules, testing methods, and marking. The standard applies to natural gas and oil pipelines with nominal pressures 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 formatting requirements of GB/T 1.1-2000. Second, it incorporates some terminology and definitions from international standards. Third, it introduces additional pressure ratings such as PN16, PN25, and PN40. Fourth, it revises the ordering requirements. Fifth, it increases the structural length for ball valves larger than DN1000. Sixth, it adds specific bolt thread requirements for valve housing connections. Seventh, it includes welding and inspection requirements based on Chinese regulations. Eighth, it provides detailed inspection rules for valves.
The main technical content of GB/T 19672 includes definitions of terms such as full-bore valve, reducing valve, shrink valve, one-way valve, two-way valve, and locking device to ensure accurate application of the standard. It describes typical structures and connection types for gate, ball, plug, and check valves used in long-distance pipelines. The standard references GB 9131 for pressure-temperature grades and material selection, ensuring compatibility with domestic standards.
It also defines the structural length of valves, aligning with API 6D for interchangeability. For valves with one end welded and the other flanged, specific length requirements are outlined. The standard specifies the path representation, differentiating between full-bore and reduced-bore valves by clearly stating the nominal size and actual flow diameter.
To meet pipeline cleaning and maintenance needs, it sets minimum channel diameters and regulates the cross-sectional shape of the flow path. Structural requirements are included to ensure proper performance and operation of long-distance pipeline valves, including torque and operational performance criteria.
Material specifications cover common valve body materials, corrosion resistance, hardness, and welding requirements. Testing procedures follow API 6D guidelines, covering all necessary tests, dwell times, and methods. The standard was developed and managed by the National Valve Standardization Technical Committee (SAC/TC188) and came into effect on August 1, 2005.