This standard specifies the type and size, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of flexible pipe joints. This standard is applicable to flexible pipe joints with nominal pressure of 1MPa and 1.6MPa, nominal diameter of 20~300mm and ambient temperature of -25~80℃ for pipeline systems with water, mineral oil, air, etc. as media. JB/T 7339-1994 Flexible pipe joints JB/T7339-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7339-94
Flexible Pipe Joints
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Flexible Pipe
1 Subject Content and Scope of Application
JB/T 7339-94
This standard specifies the types and sizes, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of flexible pipe joints. This standard applies to pipe systems with water, mineral oil, air and other media, with nominal pressures of 1MPa and 1.6MPa, nominal diameters of 20 to 300mm, and flexible pipe joints with ambient temperatures of -25 to +80°C. 2 Reference standards
GB1414
GB/T1804
GB2555
GB7306
Basic dimensions of ordinary end grain (diameter 1 to 600mm) Ordinary Thread tolerance and fit (diameter 1~355mm) Ordinary thread size series for pipe screw-in end General tolerance Unnoted tolerance of linear size
General purpose pipe flange connection size
Pipe thread sealed with thread
GB/T1271660°conical pipe thread
3 Product classification
3.1 Product variety and type
The connection type of flexible pipe joints is divided into flange connection and threaded connection. 3.1.1 Flange-connected swivel pipe joints, with a diameter of 20~100mm and a nominal pressure of 1.6MPa, with a diameter of 125~300mm and a nominal pressure of 1MPa,
3.1.2 Threaded flexible pipe joints, with a diameter of 20~50mm and a nominal pressure of 1.6MPa. 3.1.3 Threaded flexible pipe joints are divided into three types of threaded connection: ordinary thread, pipe thread sealed with thread and 60° cone pipe thread. The thread category codes are represented by "M", "R\ and \Z" respectively. 3.1.3.1 The end types of flexible pipe joints connected with threaded pipe thread and 60° cone thread pipe are divided into three types: Type A - both ends are external threads; Type B - both ends are internal threads; Type C 3.1.3.2 Ordinary thread connection is divided into two types of sealing: Type D is a combined gasket seal: Type H
3.2 Product marking
Pipe joint X××
Approved by the Ministry of Machinery Industry on July 18, 1994
It is an O-ring seal.
One end is external thread and the other end is internal thread. Sealing type code (only ordinary threaded connection has this code) End type code (only pipe thread sealed with thread and 60° cone pipe thread connection has this code) Thread category code (not marked for flange connection) Nominal diameter value
1995-07-01 implementation
Marking example
JB/T7339-94
Example 1: Diameter D%=65mm·Nominal pressure w=1.6MPa, flange Flexible pipe joints connected: pipe joints 65JB/T, 7339-94
Example 2: diameter Dz = 200mm, nominal pressure ps = 1MPa. Flexible pipe joints connected with flanges: pipe joints 200JB/T7339-94
Example 3: diameter D% = 25mm, nominal pressure p% - 1.6MPa, connected with pipe threads sealed with media threads, both ends are external threads of flexible pipe joints:
Pipe joints 25 RAJB/T7339-94
Example 4: diameter D%=32mm, nominal pressure Ps-1.6MPa, 60° tapered pipe thread connection, one end with external groove and the other end with internal thread, flexible pipe joint:
Pipe joint 32ZCJB/T7339-94
Example 5: diameter Di-40mm, nominal pressure p%=1.6MPa, ordinary thread connection, flexible pipe joint sealed with combined sealing gasket Head: Pipe joint 40MDJB/T7339-94
3.3 Structural dimensions
3.3.1 The structural dimensions of the flange-connected flexible pipe joints are shown in Figure 1 and Table 1. 3.3.2 The structural dimensions of the flexible pipe joints connected with threaded pipes with threaded seals are shown in Figure 2, Figure 3, Figure 4 and Table 2, Table 3, Table 4. 3.3.3 The structural dimensions of the flexible pipe joints connected with 60° tapered pipe threads are shown in Figure 5, Figure 6, Figure 7 and Table 5, Table 6, Table 7. , The structural dimensions of the flexible pipe joints with ordinary threaded connections are shown in Figures 8, 9 and Tables 8 and 9. 3. 3. 4
JB/T 7339-94
Axial displacement
Reli/e
Rcli/2
JB/T7339-94
Wrench size
Wrench size
Displacement
Displacement
Re11/2
JB/T 733994
Wrench size
Displacement
NPT3/4
NPT11/4
NPT11/2
NPT3/4
NPT1/4
NPT11/2
JB/T 733994
Wrench size
Wrench size
Displacement
Displacement
NPT3/4
NPT11/4
NPT11/2
NPT3/4
NPT11/4
NPT11/2
JB/T 733994
Wrench sizebzxZ.net
Displacement
M27×2
M33×2
M42×2
M48×2
M60×2
JB/T7339—94
Wrench size
Note: The entire surface of the combined seal (JB982-77) for sealing is supplied with the connector. s
M42×2
M60×2
M68×2
O-shaped drawing
22.4X3.55
32.5×3.55
37.5×3.55
47.5×3.55
Note: The O-shaped close-fitting drawing (GB3452.1-82) for close-fitting is supplied with the connector, 8
Wrench size
Displacement
Displacement
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