Main application

  • Valves
  • Sootblowers

Material of Construction

Part Material
1 Nut/Boltextension 1.4301
2 Springcup 1.4305/1.4301
3 Spring 1.8159 galCd
4 Springcover 1.4305/1.4301

Note

For best function and long-lasting performance, always use white Antiseize assembly paste to lubricate the threads of the eyeglass bolts.

Installation instructions

The PROLOAD Live Loading System screws on top of the bolt in a kind of cup form and giving thereby plenty of extra length to accommodate the uncompressed disc spring stack. This incorporates also an equal load of compression for thermal expansion of the valve. The springs cannot be overcompressed as the optimum compression length is set by the PROLOAD housing dimension. 

A sideeffect of the system is that the disc springs slide instead on a thread on a smooth machined surface. Further they are encapsulated and protected against dirt and environmental impact.

Functional Description

When the packing or gasket settles in operation the springs maintain the gland pressure and the sealing force constant. The settling is shown by a small inspection gap at the bottom of the housing. At a routine inspection the PROLOAD-STAT Live Loading System  is simply torqued down till the gap is closed.

Registered users can view stock information

PROLOAD-STAT LiveLoading
New Generation encapsulated Disc Spring System with defined compression length

Advantages

  • Disc springs slide on an even machined surface rather on a bolt thread
  • Disc springs are encapsulated by outer cylinder against environmental impact
  • Disc springs never get over-compressed
  • No torque measuring tools necessary
  • Relaxation of the springset by volumeloss of the packing stack will show on an inspection gap.
  • Simply tighten the nut until the gap closes
  • PROLOAD-STAT Live Loading System acts as a prevention against mechanical destruction of packing
  • Extended nut screws on the existing valve bolt and eliminates the need for new longer bolts
Data sheet PDF-Download
Data sheet PDF-Download Imperial

Typical problem

The stack of disc springs is too long for the of the available bolt length. 
As a result usually the bolts need to be replaced which is time and cost consuming.

Solution

PROLOAD Live Loading

  • Improves reliability
  • Compensates for pressure deviations and temperature fluctuations
  • Reduces maintenance costs

Dimensions

M in (mm)Order-TypeD in (mm)H in (mm)h1 in (mm)SWs in (mm)Bolt center to stem min (mm)FE (N)ME (Nm)
M8L8

22

20.2

14.5

13

14.8

12

4,660

7

M8L8HI

22

20.2

14.5

13

14.8

12

9,256

14

M10L10

26

23

16

17

19.6

14

4,722

9

M10L10HI

26

30.5

23.3

17

19.6

14

9,440

18

M10L10Sootblower

26

30.5

23.3

17

19.6

14

4,722

9

M12L12

32

24

17.2

19

21.9

17

9,346

20

M12L12HI

32

32

25.2

19

21.9

17

18,224

40

M12L12Sootblower

32

32

25.2

19

21.9

17

9,346

20

M14L14

38

28

18

22

25.3

20

16,254

48

M14L14HI

38

36

26

22

25.3

20

31,695

96

M16L16

38

28

18

24

25.3

20

16,254

48

M16L16HI

38

36

26

24

25.3

20

31,695

96

M18L18

45

62.5

47.5

30

34.5

23.5

40,258

136

M18L18HI

45

62.5

47.5

30

34.5

23.5

50,245

170

M20L20

45

62.5

47.5

30

34.5

23.5

40,258

136

M20L20HI

45

62.5

47.5

30

34.5

23.5

50,245

170

M22L22

60

60

39.5

36

42

31

38,530

144

M24L24

60

60

39.5

36

42

31

38,530

144

Dimension

M in (inch)Order-TypeD in (inch)H in (inch)SWh1 in (inch)s in (inch)Bolt center to stem min (inch)FE (N)ME (ftlb)
5/16"L5/16"

0.87

0.80

  1/2

0.57

0.58

0.47

1,048

5.2

5/16"L5/16"HI

0.87

0.80

  1/2

0.57

0.58

0.47

2,081

10.3

3/8"L3/8"

1.02

0.91

  9/16

0.63

0.77

0.55

1,062

6.6

3/8"L3/8"HI

1.02

1.20

  9/16

0.92

0.77

0.55

2,122

13

3/8"L3/8"Sootblower

1.02

1.20

  9/16

0.92

0.77

0.55

1,062

6.6

7/16"L7/16"

1.26

0.94

11/16

0.68

0.86

0.86

2,101

14.8

7/16"L7/16"HI

1.26

1.26

11/16

0.99

0.86

0.86

4,097

29.5

1/2"L1/2"

1.26

0.94

  3/4

0.68

0.86

0.86

2,101

14.8

1/2"L1/2"HI

1.26

1.26

  3/4

0.99

0.86

0.86

4,097

29.5

1/2"L1/2"Sootblower

1.26

1.26

  3/4

0.99

0.86

0.86

2,101

14.8

9/16"L9/16"

1.50

1.10

13/16

0.71

1.00

0.79

3,654

35

9/16"L9/16"HI

1.50

1.42

13/16

1.02

1.00

0.79

7,125

71

5/8"L5/8"

1.50

1.10

15/16

0.71

1.00

0.93

3,654

35

5/8"L5/8"HI

1.50

1.42

15/16

1.02

1.00

0.93

7,125

71

3/4"L3/4"

1.77

2.46

1  1/8

1.87

1.36

0.93

9,050

100

3/4"L3/4"HI

1.77

2.46

1  1/8

1.87

1.36

0.93

11,295

125

7/8"L7/8"

2.36

2.36

1  5/16

1.56

1.65

1.22

8,662

106

1"L1"

2.36

2.36

1  1/2

1.56

1.65

1.22

8,662

106

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