The technical requirements for pipeline valves are as follows:
GB/t19672-2005 was revised and formulated based on ISO 14313:1999 for the petroleum and natural gas industry; Pipeline transmission system; Pipeline valves>; Valve/api6d: 2002 pipeline valve>; Valves. This standard specifies the terminology, structural types and parameters, ordering requirements, technical requirements, materials, inspection rules, test methods, markings, etc. of gate valves, ball valves, check valves, and plug valves with flange connections and welded connections. Suitable for natural gas and oil pipelines with nominal pressures ranging from PN16 to PN420 and nominal diameters ranging from DN15 to DN1200, including gate valves, ball valves, check valves, and plug valves.
The main differences between GB/t19672 and ISO 14313/API6D are as follows:
(1) The standard format follows the requirements of GB/T1.1-2000, which is different from ISO/API standards.
(2) Adopt some terms and definitions from the standard.
(3) Added nominal pressure PN16 PN25、PN40。
(4) The order requires content modification.
(5) Increased the structural length of ball valves larger than DN1000.
(6) Added requirements for the threads of the connecting bolts of the valve housing.
(7) Welding and inspection requirements shall be stipulated in accordance with the requirements of Chinese laws and regulations.
(8) Established inspection rules for valves.
GB/t19672 Main Technical Content Description:
(1) Terminology
Explain full diameter valves, reducing valves, reducing valves, one-way valves, two-way valves, and locking devices. In order to correctly use the relevant requirements of the standard.
(2) Structure
The typical structure and connection form of gate valves, ball valves, and plug valves and check valves used in long-distance pipelines are provided.
(3) Pressure and temperature rating
The shell material used for valves should comply with the provisions of GB9131 and be applicable to the pressure and temperature standards of GB9131.
(4) Structural length
The structural length of foreign pipeline valves meets the structural length requirements of API6D, and the standard also meets the structural length requirements of API6D, so that valves can be interchanged. The structural length of a valve with one end welded and the other end flanged is required.
(5) Representation of diameter
The nominal size and actual channel diameter of the valve shall refer to the diameter expression specified in API6D. Easy to distinguish: full diameter valve, reducing valve, and reducing valve, and clearly indicate the nominal size of the valve (the same as the pipeline) and the actual channel diameter.
(6) Zui small diameter and channel shape
For the cleaning and dredging requirements of long-distance pipelines, refer to API6D for the valve's minimum channel and specify the channel cross-sectional shape.
(7) Structural requirements
It specifies the structures that affect the performance of valves in long-distance pipelines and have operational requirements. It specifies the operating torque and performance requirements for pipeline valves.
(8) Material
Listed the commonly used valve housing materials, anti-corrosion treatment measures, and hardness requirements for sulfur resistance. Welding and repair welding requirements for valves.