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

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 28JB978-77
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
Assemblywww.bzxz.net
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
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