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Mechanical seals

NMM-2 Metal bellows mechanical seal

 

Mechanical seals with metal bellows are used if it is necessary to avoid using any elastomer components in the seals, for example, if they are used in the chemical processing industry. The main reason for rejecting elastomers, apart from their chemical disparity, also lies with the small temperature range for elastomer component application. More specifically, when either the maximum or the minimum temperature limit is exceeded, elsatomers will lose their function.

The production of metal bellows is based on connecting a big number of profiled lamels. The number of lamels is determined by the strength which the seal must achieve. The connection is welded.

Mechanical seals with metal bellows are suitable for use in operating conditions which are characterized by high temperature and high pressure. Besides, this type of seal can be used for sealing crystallizable liquids and liquids containing other solid substances, as the bellows are capable of self-purification based on the centrifugal force principle.

 

Analog:

Burgmann MF95N, John Crane 515 / 5515

 

Mechanical seals with metal bellows are recommended for sealing:

- highly contaminated liquids, including hydrochloric and acetic acids at elevated temperatures;

- oils and lubricants;

- water and juice;

- in the chemical and oil industries;

- in the organic chemical industry.


 

Materials for sealing faces:

carbographite

chromium steel

nickel chrome steel

increased rigidity nickel chrome steel

tungsten carbide

silicon carbide

ceramics (AI2O3)

 

Operating limits:

p = 15 bars

t = -40 ... 220В°C

v = 25 m/s

 

d1

d3

D6

D7

l1k

l3 l8

20

34

29

35

37.5

30.5 15

22

36

31

37

37.5

30.5 15

24

39

33

39

40

33 15

25

39

34

40

40

33 15

28

42

37

43

42.5

35.5 15

30

44

39

45

42.5

35.5 15

32

46

42

48

42.5

35.5 15

33

47

42

48

42.5

35.5 15

35

49

44

50

42.5

35.5 15

38

54

49

56

45

37 16

40

56

51

58

45

37 16

43

59

54

61

45

37 16

45

61

56

63

45

37 16

48

64

59

66

45

37 16

50

66

62

70

47.5

38 17

53

69

65

73

47.5

38 17

55

71

67

75

47.5

38 17

58

78

70

78

52.5

42 18

60

80

72

80

52.5

42 18

63

83

75

83

52.5

42 18

65

85

77

85

52.5

42 18

68

87

81

90

52.5

41.5 18.5

70

90

83

92

60

48.5 19

75

99

88

97

60

48.5 19

80

104

95

105

60

48.5 19

85

109

100

110

60

48.5 19

90

114

105

115

65

52 20.5

95

119

110

120

65

52 20.5

100

124

115

125

65

52 20.5

+ customized seals as per your drawings and specifications

Description

 

Mechanical seals with metal bellows are used if it is necessary to avoid using any elastomer components in the seals, for example, if they are used in the chemical processing industry. The main reason for rejecting elastomers, apart from their chemical disparity, also lies with the small temperature range for elastomer component application. More specifically, when either the maximum or the minimum temperature limit is exceeded, elsatomers will lose their function.

The production of metal bellows is based on connecting a big number of profiled lamels. The number of lamels is determined by the strength which the seal must achieve. The connection is welded.

Mechanical seals with metal bellows are suitable for use in operating conditions which are characterized by high temperature and high pressure. Besides, this type of seal can be used for sealing crystallizable liquids and liquids containing other solid substances, as the bellows are capable of self-purification based on the centrifugal force principle.

 

Analog:

Burgmann MF95N, John Crane 515 / 5515

 

Mechanical seals with metal bellows are recommended for sealing:

- highly contaminated liquids, including hydrochloric and acetic acids at elevated temperatures;

- oils and lubricants;

- water and juice;

- in the chemical and oil industries;

- in the organic chemical industry.


 

Materials for sealing faces:

carbographite

chromium steel

nickel chrome steel

increased rigidity nickel chrome steel

tungsten carbide

silicon carbide

ceramics (AI2O3)

 

Operating limits:

p = 15 bars

t = -40 ... 220В°C

v = 25 m/s

 

d1

d3

D6

D7

l1k

l3 l8

20

34

29

35

37.5

30.5 15

22

36

31

37

37.5

30.5 15

24

39

33

39

40

33 15

25

39

34

40

40

33 15

28

42

37

43

42.5

35.5 15

30

44

39

45

42.5

35.5 15

32

46

42

48

42.5

35.5 15

33

47

42

48

42.5

35.5 15

35

49

44

50

42.5

35.5 15

38

54

49

56

45

37 16

40

56

51

58

45

37 16

43

59

54

61

45

37 16

45

61

56

63

45

37 16

48

64

59

66

45

37 16

50

66

62

70

47.5

38 17

53

69

65

73

47.5

38 17

55

71

67

75

47.5

38 17

58

78

70

78

52.5

42 18

60

80

72

80

52.5

42 18

63

83

75

83

52.5

42 18

65

85

77

85

52.5

42 18

68

87

81

90

52.5

41.5 18.5

70

90

83

92

60

48.5 19

75

99

88

97

60

48.5 19

80

104

95

105

60

48.5 19

85

109

100

110

60

48.5 19

90

114

105

115

65

52 20.5

95

119

110

120

65

52 20.5

100

124

115

125

65

52 20.5

+ customized seals as per your drawings and specifications

Name
NMM-2 Metal bellows mechanical seal