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Metal bellows mechanical seals

Metal bellows mechanical seals

  $0.00
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
pcs.
  $0.00
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:

AESSEAL BSAI / BSAIG, Burgmann MFL85N / MFLWT80, John Crane 670 / 680, Chesterton 886

 

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

D4min

l3

I1k

20

34

36

25.5

37.5

22

36

38

25.5

37.5

24

38

40

28

40

25

39

41

28

40

28

42

44

30.5

42.5

30

44

46

30.5

42.5

32

46

48

30.5

42.5

33

47

49

30.5

42.5

35

49

51

30.5

42.5

38

52.5

56

32

45

40

54.5

58

32

45

43

58

62

32

45

45

60

64

32

45

48

63

67

32

45

50

66

70

34

47.5

53

69

73

34

47.5

55

71

75

34

47.5

58

74

78

39

52.5

60

76.5

80

39

52.5

63

79.5

84

39

52.5

65

81.5

85

39

52.5

68

85

89

39

52.5

70

88

92

45.5

60

75

93.5

98

45.5

60

80

98.5

103

45

60

85

105

110

45

60

90

110

115

50

65

95

115

120

50

65

100

120

125

50

65

+ customized seals as per your drawings and specifications

Name
NMM-1 Metal bellows mechanical seal
pcs.
  $0.00
Description

 

Analog:

John Crane 605, Burgmann MFLWT80 / MFLCT80, AES BSAIG

 

The solution for extreme temperatures and highly viscous media.

Design with welded metal bellows.

Secondary seals made of thermally expanded graphite.

Hydraulically unloaded.

It does not depend on the direction of rotation of the shaft.

 

Materials of friction pair:

- carbon graphite (A, B)

- tungsten carbide (U3)

- silicon carbide (Q1, Q2)

 

Secondary seals:

- thermally expanded graphite (G)

 

Parameters:

- p = 25 bars

- t = -100 ... 400В°C

- v = 20 m/s

 

Do not require any adaptation of the pump.

 

To order seals, it is sufficient to know the pump grade or the manufacturer's seal number.

 

Name
NMM-G Metal bellows mechanical seal
pcs.