Hecker Aegira®
HN 450

Metal roller bellows, balanced, independent on direction of rotation

Design features:
Self-cleaning metal roller bellows, no dynamically loaded O-ring, thus unaffected by deposits on the shaft, the mobility of the bellows remains unchanged.

Fields of application:
Chemical industry, food industry, pharmaceutical industry and sterile processes

Application limits:
P = 20 bar external pressure
T = -40°C to + 200°C
Depending on the material of the secondary seal
Vg = 15 m/s

 hn45gros.gif (23880 Byte)

 

 

Standard materials:
Seal face: A, Q1
Stationary ring: Q1
Further materials on demand

 
Fields of application
HN 450

The Hecker Aegira® mechanical seal HN 450 is a metal roller bellows for installation dimensions according to DIN 24960 ll1k.

By means of a favourable design of the waves of the bellows the hydraulically loaded area is reduced in comparison to the seal face. This effects a balance ration less than 1 without any step on the shaft. Therefore higher fluid pressures and lower friction losses can be realized in comparison to conventional unbalanced mechanical seals that have the same installation dimensions.

The metal roller bellows has the function of the spring, the torque-transfer and the dynamic secondary sealing of the seal face. A damage of the shaft sleeve through an axial moved O-Ring and the blockade of the seal face through deposits on the shaft is avoided. The friction heat of the sealing gap has no influence on the secondary seal. The operational safety is increased in comparison to conventional mechanical seal with a dynamic O-Ring.

The open contour of the waves prevents an accumulation of solid particles. Therefore this seal ist predestinated for fluids that contain fibrous particles in the chemical industry and sludge in the sewage technology.

hn450de.jpg (12569 Byte)




Due to the smooth outer contour the bellows can be cleaned easily. Therefore, it there are low requests of sterility the HN 450 is suitable for the use in the food - and pharmaceuticals industry. Standard-materials for seal face - and stationary ring are silicon-carbide and carbon graphite. The metal-bellow consists of Hastelloy.

The HN 450 is suitable for pressures up to 20 bar, sliding velocities up to 15 m/s. The temperature range ist –40°C up to 200°C, dependant on the material of the secondary sealing.
Dimension chart
HN 450 

1 Seal face
2 Stationary ring
3 O-ring
4 Seal-face-housing
5 Metal-bellows
6 Drive collar
7 O-Ring
8 Threaded pin

 

 hn4502.jpg (11855 Byte)
Dimension Chart
(dimensions in mm)

NennÆ

d1

d3

d6

d7

d8

d9

l1k

l3

l5

l6

016

016

26

23

27

3

M4

35

29,5

1,5

4

024

024

38

33

39

3

M5

40

33

2

5

028

028

42

37

43

3

M5

42,5

35,5

2

5

033

033

47

42

48

3

M5

42,5

35,5

2

5

038

038

54

49

56

4

M5

45

38

2

6

040

040

56

51

58

4

M5

45

37,5

2

6

043

043

59

54

61

4

M5

45

37

2

6

053

053

69

65

73

4

M5

47,5

39

2,5

6

060

060

80

72

80

4

M5

52,5

43

2,5

6

065

065

85

77

85

4

M6

52,5

43

2,5

6