This standard specifies the structural type and connection dimensions of copper wire sealed bakeable flanges used in ultra-high vacuum systems. This standard applies to flange connections sealed with copper wire in ultra-medium vacuum systems with pressures below 1×10-nPa. JB/T 5278.1-1991 Copper wire sealed bakeable vacuum flange connection JB/T5278.1-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB5278.1~5278.3-91
Copper wire sealed bakeable vacuum flange
1991-01-01 Issued
The Ministry of Machinery and Electronics Industry of the People's Republic of China Issued
1991-07-01 Implementation
JB5278.1-91
JB5278.291
JB5278.3--91
Copper wire sealed bakeable vacuum flange
Copper wire sealed bakeable Bake-out vacuum flange
Copper wire sealed bake-out vacuum flange
Connection type
Flange structure size
Copper wire sealing ring structure size
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Mechanical industry standard of the People's Republic of China
Copper wire sealed bake-out vacuum flange
Connection type
Subject content and scope of application
JB5278.1—91
This standard specifies the structure type and connection size of copper wire sealed bake-out flange used in ultra-high vacuum system. This standard applies to flange connection with copper wire seal in ultra-high vacuum system with pressure below 1×10-5Pa. 2 Reference standards
GB3280
GB3281
Nominal diameter of vertical flange
Copper wire seal bakeable vacuum flange Flange structure dimensions Copper wire seal bakeable vacuum flange
Copper wire seal ring structure dimensions
Technical conditions for stainless acid-resistant and heat-resistant steel thin platesTechnical conditions for stainless acid-resistant and heat-resistant steel thick plates3 Structural type and connection dimensionswwW.bzxz.Net
The flange structure specified in this standard is an extruded copper wire seal structure, as shown in the figure below. 3.1
3.2 The nominal diameter of the flange shall comply with the provisions of GB6070.1. H
1-A type flange; 2-Copper wire seal ring; 3-T type flange; 4-Takeover Approved by the Ministry of Machinery and Electronics Industry on January 1, 1991 and implemented on July 1, 1991
The connection size is as specified in the table below.
Nominal diameter
Technical requirements
JB 5278.1-91
(recommended)
4.1 The flanges specified in this standard are divided into A type and T type. T type flanges are used in the case of facing the air flow direction. T type and A type flanges shall comply with the provisions of JB5278.2.
4.2 The copper wire seal ring used in this standard shall comply with the provisions of JB5278.3. The pipe is made of 1Gr18Ni9Ti stainless steel plate specified in GB3280 and GB3281. 4.3
The pipe and flange are welded by argon arc welding, the inner weld is continuous welding, and the outer weld is intermittent reinforcement welding. 4.4
Bolts, nuts and washers are all made of 1Cr18Ni9Ti stainless steel. Molybdenum disulfide lubricant should be added between bolts and nuts during assembly. 4.5
The maximum allowable baking temperature of the flange is 450℃. When the flange is repeatedly baked at 450℃, the gas leakage rate at the seal is not greater than 1×10-*Pa·L/s.
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