Mechanical Seal TB687 replace John Crane 680
Mechanical Seal TB687 replace John Crane 680
Mechanical Seal TB687 replace John Crane 680
Mechanical Seal TB687 replace John Crane 680
Mechanical Seal TB687 replace John Crane 680

Mechanical Seal TB687 replace John Crane 680

Model
TB687

Item specifics

Temperature
-75℃-200℃
Speed
≦23m/s
Pressure
≦2.1MPA
Stationary Seat
TBG9
Rotary Ring Material
CAR/SIC/TC
Stationary Ring Material
CER/SIC/TC
O-Ring Material
VIT, Encasulated Ring, EPDM
Spring & Metal Parts
SUS304/SUS316
Application
Clean Water，Sewage Water，Oil

Review

Description

Product Introduction 
Product Size
Product Details
Product Model
Mechanical seal TB687 
Replacement to:
John Crane 680

Operational Conditions:
Temperature: -75℃ to +200℃
Pressure: ≤2.1MPa
Speed: ≤23m/s

Materials:
Stationary Ring: Silicon Carbide, TC, Cer
Rotary Ring: Silicon Carbide, Car, TC
Secondary Seal: Expanded Graphite, VIT, EPDM
Spring and Metal Parts: SUS304,SUS316 
Applications:
Clean water,
sewage water
oil and other moderately corrosive fluids
Stationary Seat:
Standard: TBG9
Alternative:
Product details
SIZE
Size/
Metric
d
D3
L1
INCH
d
D3
L1
18
18
32.00
27.7
0.750
0.750
1.312
1.250
20
20
33.30
27.7
0.875
0.875
1.437
1.250
22
22
36.00
27.7
0.937
0.937
1.500
1.250
24
24
38.10
30.2
1.000
1.000
1.562
1.250
25
25
39.00
30.2
1.125
1.125
1.687
1.250
28
28
42.00
32.7
1.250
1.250
1.812
1.312
30
30
44.00
32.7
1.375
1.375
1.937
1.437
32
32
46.00
32.7
1.500
1.500
2.063
1.437
33
33
47.00
32.7
1.625
1.625
2.187
1.437
35
35
49.20
32.7
1.750
1.750
2.312
1.437
38
38
52.40
34.2
1.875
1.875
2.437
1.500
40
40
55.60
34.2
2.000
2.000
2.562
1.500
43
43
58.70
34.2
2.125
2.125
2.687
1.500
45
45
58.70
34.2
2.250
2.250
2.812
1.562
48
48
61.90
34.2
2.375
2.375
2.937
1.562
50
50
65.10
34.7
2.500
2.500
3.187
1.562
53
53
68.30
34.7
2.625
2.625
3.312
1.625
55
55
71.00
34.7
2.750
2.750
3.437
1.625
60
60
74.60
39.7
2.875
2.875
3.625
1.687
65
65
84.10
39.7
3.000
3.000
3.750
1.687
70
70
87.30
45.2
3.125
3.125
3.875
1.750
75
75
95.30
45.2
3.250
3.250
4.000
1.750
80
80
98.40
44.7
3.375
3.375
4.125
1.750
85
85
104.80
44.7
3.500
3.500
4.250
1.875
90
90
108.00
49.7
3.625
3.625
4.375
1.875
95
95
114.30
49.7
3.750
3.750
4.500
1.875
3.880
3.880
4.625
1.875
4.000
4.000
4.750
1.875

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