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NV-3 Mechanical seal with wavy spring
DIN 24960
Seals with a corrugated spring are specifically recommended for use at thermal power stations. Apart from the fact that no cases of spring blocking have been observed, an additional advatnage is that it is possible to produce such seals with a smaller diameter, if necessary, but with the same spring pressure. Besides, the spring design envisages special metal frames, in which the springs are inserted, and the seal can be used whichever the direction of shaft rotation is.
A relieved version of the seal with one corrugated spring is available.
Analog:
AESSEAL W07D / W07DM, Burgmann M7N, Vulcan 1677, Sterling 270, Flowserve Europac 600, KSB
Materials for sealing faces:
carbographite
chromium steel
nickel chrome steel
increased rigidity nickel chrome steel
tungsten carbide
silicon carbide
ceramics (AI2O3)
Operating limits:
p = 16 bars
t = -40 ... 220В°C
v = 20 m/s
NV-3.1 carbographite pressed into the sealing surface frame
NV-3.2 silicon carbide pressed into the sealing surface frame
NV-3.3 seal surface with tungsten carbide soldered on
|
d1 |
d3 |
D4 |
D6 |
D7 |
D8 |
l3 |
l4 |
I1k |
|
18 |
32 |
34 |
27 |
33 |
3 |
26 |
11.5 |
37.5 |
|
20 |
34 |
36 |
29 |
35 |
3 |
26 |
11.5 |
37.5 |
|
22 |
36 |
38 |
31 |
37 |
3 |
26 |
11.5 |
37.5 |
|
24 |
38 |
40 |
33 |
39 |
3 |
28.5 |
11.5 |
40 |
|
25 |
39 |
41 |
34 |
40 |
3 |
28.5 |
11.5 |
40 |
|
28 |
42 |
44 |
37 |
43 |
3 |
31 |
11.5 |
42.5 |
|
30 |
44 |
46 |
39 |
45 |
3 |
31 |
11.5 |
42.5 |
|
32 |
46 |
48 |
42 |
48 |
3 |
31 |
11.5 |
42.5 |
|
33 |
47 |
49 |
42 |
48 |
3 |
31 |
11.5 |
42.5 |
|
35 |
49 |
51 |
44 |
50 |
3 |
31 |
11.5 |
42.5 |
|
38 |
54 |
58 |
49 |
56 |
4 |
31 |
14 |
45 |
|
40 |
56 |
60 |
51 |
58 |
4 |
31 |
14 |
45 |
|
43 |
59 |
63 |
54 |
61 |
4 |
31 |
14 |
45 |
|
45 |
61 |
65 |
56 |
63 |
4 |
31 |
14 |
45 |
|
48 |
64 |
68 |
59 |
66 |
4 |
31 |
14 |
45 |
|
50 |
66 |
70 |
62 |
70 |
4 |
32.5 |
15 |
47.5 |
|
53 |
69 |
73 |
65 |
73 |
4 |
32.5 |
15 |
47.5 |
|
55 |
71 |
75 |
67 |
75 |
4 |
32.5 |
15 |
47.5 |
|
58 |
78 |
83 |
70 |
78 |
4 |
37.5 |
15 |
52.5 |
|
60 |
80 |
85 |
72 |
80 |
4 |
37.5 |
15 |
52.5 |
|
63 |
83 |
88 |
75 |
83 |
4 |
37.5 |
15 |
52.5 |
|
65 |
85 |
90 |
77 |
85 |
4 |
37.5 |
15 |
52.5 |
|
68 |
88 |
93 |
81 |
90 |
4 |
37.5 |
15 |
52.5 |
|
70 |
90 |
95 |
83 |
92 |
4 |
43 |
17 |
60 |
|
75 |
99 |
104 |
88 |
97 |
4 |
43 |
17 |
60 |
|
80 |
104 |
109 |
95 |
105 |
4 |
43 |
17 |
60 |
|
85 |
109 |
114 |
100 |
110 |
4 |
43 |
17 |
60 |
|
90 |
114 |
119 |
105 |
115 |
4 |
48 |
17 |
65 |
|
95 |
119 |
124 |
110 |
120 |
4 |
48 |
17 |
65 |
|
100 |
124 |
129 |
115 |
125 |
4 |
48 |
17 |
65 |
+ customized seals as per your drawings and specifications
- Description
DIN 24960
Seals with a corrugated spring are specifically recommended for use at thermal power stations. Apart from the fact that no cases of spring blocking have been observed, an additional advatnage is that it is possible to produce such seals with a smaller diameter, if necessary, but with the same spring pressure. Besides, the spring design envisages special metal frames, in which the springs are inserted, and the seal can be used whichever the direction of shaft rotation is.
A relieved version of the seal with one corrugated spring is available.
Analog:
AESSEAL W07D / W07DM, Burgmann M7N, Vulcan 1677, Sterling 270, Flowserve Europac 600, KSB
Materials for sealing faces:
carbographite
chromium steel
nickel chrome steel
increased rigidity nickel chrome steel
tungsten carbide
silicon carbide
ceramics (AI2O3)
Operating limits:
p = 16 bars
t = -40 ... 220В°C
v = 20 m/s
NV-3.1 carbographite pressed into the sealing surface frame
NV-3.2 silicon carbide pressed into the sealing surface frame
NV-3.3 seal surface with tungsten carbide soldered on
d1
d3
D4
D6
D7
D8
l3
l4
I1k
18
32
34
27
33
3
26
11.5
37.5
20
34
36
29
35
3
26
11.5
37.5
22
36
38
31
37
3
26
11.5
37.5
24
38
40
33
39
3
28.5
11.5
40
25
39
41
34
40
3
28.5
11.5
40
28
42
44
37
43
3
31
11.5
42.5
30
44
46
39
45
3
31
11.5
42.5
32
46
48
42
48
3
31
11.5
42.5
33
47
49
42
48
3
31
11.5
42.5
35
49
51
44
50
3
31
11.5
42.5
38
54
58
49
56
4
31
14
45
40
56
60
51
58
4
31
14
45
43
59
63
54
61
4
31
14
45
45
61
65
56
63
4
31
14
45
48
64
68
59
66
4
31
14
45
50
66
70
62
70
4
32.5
15
47.5
53
69
73
65
73
4
32.5
15
47.5
55
71
75
67
75
4
32.5
15
47.5
58
78
83
70
78
4
37.5
15
52.5
60
80
85
72
80
4
37.5
15
52.5
63
83
88
75
83
4
37.5
15
52.5
65
85
90
77
85
4
37.5
15
52.5
68
88
93
81
90
4
37.5
15
52.5
70
90
95
83
92
4
43
17
60
75
99
104
88
97
4
43
17
60
80
104
109
95
105
4
43
17
60
85
109
114
100
110
4
43
17
60
90
114
119
105
115
4
48
17
65
95
119
124
110
120
4
48
17
65
100
124
129
115
125
4
48
17
65
+ customized seals as per your drawings and specifications
- Name
- NV-3 Mechanical seal with wavy spring
