This standard only stipulates the combined gaskets for welding, ferrules, expanded pipe joints and plug seals, with a nominal pressure of 400kgf/cm2 and an operating temperature of -25~80℃. JB/T 982-1977 Combined sealing gasket JB/T982-1977 Standard download and decompression password: www.bzxz.net

Ministry of Machinery Industry of the People's Republic of China
Ministry Standard
Combined sealing gasket
JB 982-77
replaces JB982-
67
This standard only stipulates the combined gaskets for welding, ferrules, flared pipe joints and plug seals, nominal pressure,
400kgf/cm*, working temperature -25~80°c. Less than 0.15
ofy
Marking example:
d
f
D
Combined sealing gasket with nominal diameter 27mm: Gasket 27JB982— 77
0-2
of
The remaining 2
piece 1 and piece 2 are glued during vulcanization|tt||The First Machinery of the People's Republic of China The Ministry of Industry issued the Standardization Research Institute of the First Ministry of Machinery Industry proposed on May 1, 1977
Implementation
Jinan Casting and Forging Machinery Research Institute and others drafted 2
A total of 3 tops Page 2| |tt||Nominal diameter
d.
Tolerance
Dimensions
8
10
12
14| |tt||16
18
20
22
24
27
30
33||tt ||36
39
42
45
48
52
60
8.4
10.4
124
14.4
16.4
18.4
20.5
22.5
24.5
27.5| |tt||30.5
33.5
36.6
39.6
42.6
45.6
48.7www.bzxz.net
52.7||tt ||60.7
d2
1 size
10
12
±0.12
±0.14
±0.17| |tt||±0.20
14
16
18
20
23
25
27|| tt||30
33
36
40
43
46
49
52||tt| |56
64
JB982-77
mm
D
Tolerance
+0.24
+0.28|| tt||+0.34
+0.40
size
14
16
18
20
22|| tt||25
28
30
32
35
38
42
46||tt| |50
53
56
60
66
75
Tolerance
-0.24
0.28
-0.34
-0.40
Material: Piece 1----Oil-resistant rubber I-4, Piece 2——A2. Technical conditions
h
2.7
2.9
hole d charge
allowed eccentricity
0.1
0.15||tt ||1. The physical and mechanical properties of oil-resistant rubber 14 should comply with the regulations of GB123576. Table 1
Applicable thread sizes
M8
M10(G1/8\)
M12
M14(G1/4\)||tt| |M16
M18 (G3/8\)
M20
M22(G1/2\)
M24
M27(G3/4\)
M30
M33(G1)
M36
M39
M42(G11/4\)
M45
M48
M52
M60 (G2\)
2. The sharp edge of part 1 must maintain a complete edge. Bubbles, impurities and convex-like defects are not allowed on the outer surface within 0.511m on both sides of the sharp edge. Allowable defects on other surfaces are as specified in Table 2. Nominal diameter
8~18
>18
gas
bubble
bubble diameter shall not be greater than 0.3
mm shall not be more than 2 places | |tt | Exceeding 0.3
mm2 shall not exceed 2 places
The impurity area shall not exceed 0. 3
mm2 shall not exceed 3 places
3. The surface of Part 2 must be smooth and free of rust and other surface defects. Page 3 of 3
Table 2
Concave and convex defects
The convexity shall not exceed o.3mm
The area shall not exceed 0.6 mm2
shall not exceed 2 The unevenness at
shall not exceed 0.4mm
and the area shall not exceed 0.7mm2
shall not exceed 2
4. The bonding strength of parts 1 and 2 must be greater than the tear strength of the rubber.
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