JB/T 977-1977 Welded branch pipe joints

JB/T 977-1977 Welded branch pipe joint JB/T977-1977 Standard download decompression password: www.bzxz.net

The First Machinery Industry Department of the People's Republic of China Standard Welded Branch Pipe Fittings
JB977-77
Replaces JB977-87
This standard applies to branch pipe fittings in oil-based pipeline systems, with a nominal pressure of 320kgf/cm2 and a working temperature of -25 to 80℃.
Marking example:
Branch pipe fittings with a pipe outer diameter of 28mm, and a fitting body of 28JB977-77
Issued by the First Machinery Industry Department of the People's Republic of China Proposed by the Standardization Research Institute of the First Machinery Industry Department Implementation on May 1, 1977wwW.bzxz.Net
Drafted by Jinan Foundry and Forging Machinery Research Institute, etc. 341
JB977-77
Standard No.
Technical conditions are in accordance with the provisions of JB1003-77. 1
JB98077
JB981—77
GB1235-
O-ring
Rubber-4
M12×1.25
M36×2
M42×2
M52×2
2. The material of the seamless steel pipe is 15, 20 steel, and the precision is ordinary grade. 342
JB997—77
Joint body
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