Main application
- Valves
- Sootblowers
Material of Construction
| Part | Material | |
|---|---|---|
| 1 | Nut/Boltextension | 1.4301 |
| 2 | Springcup | 1.4305 |
| 3 | Spring | 1.8159 galCd |
| 4 | Springcover | 1.4305 |
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.
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
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-Type | D in (mm) | H in (mm) | h1 in (mm) | SW | s in (mm) | Bolt center to stem min (mm) | FE (N) | ME (Nm) |
|---|---|---|---|---|---|---|---|---|---|
| M8 | L8 | 22 | 20.2 | 14.5 | 13 | 14.8 | 15 | 4,660 | 7 |
| M8 | L8HI | 22 | 20.2 | 14.5 | 13 | 14.8 | 15 | 9,256 | 14 |
| M10 | L10 | 26 | 23 | 16 | 17 | 19.4 | 18 | 4,722 | 9 |
| M10 | L10HI | 26 | 30.5 | 23.3 | 17 | 19.4 | 18 | 9,440 | 18 |
| M10 | L10Sootblower | 26 | 30.5 | 23.3 | 17 | 19.4 | 18 | 4,722 | 9 |
| M12 | L12 | 32 | 24 | 17.2 | 19 | 21.9 | 22 | 9,346 | 20 |
| M12 | L12HI | 32 | 32 | 25.2 | 19 | 21.9 | 22 | 18,224 | 40 |
| M12 | L12Sootblower | 32 | 32 | 25.2 | 19 | 21.9 | 22 | 9,346 | 20 |
| M14 | L14 | 38 | 28 | 18 | 22 | 25.3 | 26 | 16,254 | 48 |
| M14 | L14HI | 38 | 36 | 26 | 22 | 25.3 | 26 | 31,695 | 96 |
| M16 | L16 | 38 | 28 | 18 | 24 | 27.6 | 27 | 16,254 | 48 |
| M16 | L16HI | 38 | 36 | 26 | 24 | 27.6 | 27 | 31,695 | 96 |
| M18 | L18 | 45 | 63.5 | 48.5 | 30 | 34.5 | 31.5 | 40,258 | 136 |
| M18 | L18HI | 45 | 63.5 | 48.5 | 30 | 34.5 | 31.5 | 50,254 | 170 |
| M20 | L20 | 45 | 63.5 | 48.5 | 30 | 34.5 | 32.5 | 40,258 | 136 |
| M20 | L20HI | 45 | 63.5 | 48.5 | 30 | 34.5 | 32.5 | 50,254 | 170 |
| M22 | L22 | 60 | 72 | 57 | 41 | 47 | 41 | 38,530 | 144 |
| M24 | L24 | 60 | 72 | 57 | 41 | 47 | 42 | 38,530 | 144 |
Dimension
| M in (inch) | Order-Type | D in (inch) | H in (inch) | h1 in (inch) | s in (inch) | Bolt center to stem min (inch) | FE (N) | ME (ftlb) |
|---|---|---|---|---|---|---|---|---|
| 5/16" | L5/16" | 0.87 | 0.80 | 0.57 | 0.58 | 0.59 | 1,048 | 5.2 |
| 5/16" | L5/16"HI | 0.87 | 0.80 | 0.57 | 0.58 | 0.59 | 2,081 | 10.3 |
| 3/8" | L3/8" | 1.02 | 0.91 | 0.63 | 0.76 | 0.71 | 1,062 | 6.6 |
| 3/8" | L3/8"HI | 1.02 | 1.20 | 0.92 | 0.76 | 0.71 | 2,122 | 13.3 |
| 3/8" | L3/8"Sootblower | 1.02 | 1.20 | 0.92 | 0.76 | 0.71 | 1,062 | 6.6 |
| 7/16" | L7/16" | 1.26 | 0.98 | 0.68 | 0.86 | 0.87 | 2,101 | 14.8 |
| 7/16" | L7/16"HI | 1.26 | 1.31 | 0.99 | 0.86 | 0.87 | 4,097 | 29.5 |
| 1/2" | L1/2" | 1.26 | 0.98 | 0.68 | 0.86 | 0.87 | 2,101 | 14.8 |
| 1/2" | L1/2"HI | 1.26 | 1.31 | 0.99 | 0.86 | 0.87 | 4,097 | 29.5 |
| 1/2" | L1/2"Sootblower | 1.26 | 1.31 | 0.99 | 0.86 | 0.87 | 2,101 | 14.8 |
| 9/16" | L9/16" | 1.50 | 1.10 | 0.71 | 1.00 | 1.02 | 3,654 | 35.4 |
| 9/16" | L9/16"HI | 1.50 | 1.42 | 1.02 | 1.00 | 1.02 | 7,125 | 70.8 |
| 5/8" | L5/8" | 1.50 | 1.10 | 0.71 | 1.09 | 1.06 | 3,654 | 35.4 |
| 5/8" | L5/8"HI | 1.50 | 1.42 | 1.02 | 1.09 | 1.06 | 7,125 | 70.8 |
| 3/4" | L3/4" | 1.77 | 2.30 | 1.91 | 1.36 | 1.28 | 9,050 | 100.3 |
| 3/4" | L3/4"HI | 1.77 | 2.30 | 1.91 | 1.36 | 1.28 | 11,298 | 125.4 |
| 7/8" | L7/8" | 2.36 | 2.83 | 2.24 | 1.85 | 1.61 | 8,662 | 106.2 |
| 1" | L1" | 2.36 | 2.83 | 2.24 | 1.85 | 1.65 | 8,662 | 106.2 |