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Mechanical seals with springs in metal case

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