This standard applies to the articulated pipe joints in the oil-based medium management system, with a nominal pressure of 320kgf/cm2 and a working temperature of -25 to 80°C. JB/T 978-1977 Welded articulated pipe joints JB/T978-1977 Standard download decompression password: www.bzxz.net
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The First Machinery Industry Department of the People's Republic of China standard welded hinged pipe joints JB978-77 Replaces JB978--67 This standard applies to hinged pipe joints in oil-based pipeline systems, with a nominal pressure of 320kgf/cm2 and a working temperature of -25~80℃. Applicable pipe outer diameter 10~28mm Marking example: Pipe outer diameter D. 28mm hinged pipe joint Pipe joint 28JB978-77bzxZ.net The First Machinery Industry Ministry of the People's Republic of China issued the First Machinery Industry Ministry Standardization Institute proposed that the applicable pipe outer diameter is 34~50mm Implementation on May 1, 1977 Jinan Foundry and Forging Machinery Research Institute and others drafted 343 M10×1 (18)(12) (M20×1.5) (M24×1.5) M27×2 M33×2 M42×2 M48×2 Note, ( JB978--77 ) The inner size is limited to the selection of agricultural machinery pipe joints. Technical conditions are in accordance with the provisions of JB1003-77. Standard No. JB998-77 Joint body The material of the seamless steel pipe is 15, 20 steel, and the precision is ordinary grade. 2 JB982—77 Assembly JB999--77 M10×1.5×25 M14×1.5×32 M18×1.5×38 M20×1.5×38 M22×1.5×48 M24X1.5X48 M27×2×55 M33×2×70 M42×2×85 M48×2×95 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.