Technology Made in Germany

    PROLOAD LIVE LOADING SYSTEM

    Main application:

    Valves, Sootblowers

    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-LL 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

    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

    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 over compressed as the optimum compression length is set by the PROLOAD housing dimension. A side effect 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 System is simply torqued down till the gap is closed. The full load and compensation length of the disc springs is now available. No torque measuring tools are needed!

    Material of Construction

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

    Material of Construction graphic

    Dimensional data

    M in (mm) Order-Type D in (mm) H in (mm) h1 in (mm) SW s in (mm) Bolt center to stem min (mm) ME (Nm)
    M8 L8 22 20.2 14.5 13 14.8 15 5
    M8 L8HI 22 20.2 14.5 13 14.8 15 11
    M10 L10 26 23 16 17 19.6 18 9
    M10 L10HI 26 30.5 23.3 17 19.4 18 19
    M10 L10RB 26 30.5 23.3 17 19.4 18 9
    M12 L12 32 24 17.2 19 21.9 22 18
    M12 L12HI 32 32 25.2 19 21.9 22 40
    M12 L12RB 32 32 25.2 19 21.9 22 18
    M14 L14 38 28 18 22 o 24 25.3 26 42
    M14 L14HI 38 36 26 22 o 24 25.3 26 84
    M16 L16 38 28 18 24 27.6 27 48
    M16 L16HI 38 36 26 24 27.6 27 96
    M18 L18 45 63.5 48.5 30 34.5 31.5 119
    M18 L18HI 45 63.5 48.5 30 34.5 31.5 159
    M20 L20 45 63.5 48.5 30 34.5 32.5 121
    M20 L20HI 45 63.5 48.5 30 34.5 32.5 175
    M22 L22 60 72 57 41 47 41 132
    M22 L22HI 60 72 57 41 47 41 176
    M24 L24 60 72 57 41 47 42 145
    M24 L24HI 60 72 57 41 47 42 193
    M27 L27 89 79 53.6 46 53 58 215

    Dimensional data

    M in (inch) Order-Type D in (inch) H in (inch) h1 in (inch) s in (inch) Bolt center to stem min (inch) ME (ftlb)
    0.313 L5/16 0.87 0.80 0.57 0.58 0.59 3.7
    0.313 L5/16HI 0.87 0.80 0.57 0.58 0.59 8.1
    0.375 L3/8 1.02 0.91 0.63 0.77 0.71 6.6
    0.375 L3/8HI 1.02 1.20 0.92 0.76 0.71 14.0
    0.375 L3/8RB 1.02 1.20 0.92 0.76 0.71 6.6
    0,4375 o. 0,50 L7/16 o. L1/2 1.26 0.98 0.68 0.86 0.87 14.0
    0,4375 o. 0,50 L7/16HI o. L1/2HI 1.26 1.31 0.99 0.86 0.87 29.5
    0.50 L1/2"RB 1.26 1.31 0.99 0.86 0.87 14.0
    0.56 L9/16 1.50 1.10 0.71 1.00 1.02 31.0
    0.56 L9/16HI 1.50 1.42 1.02 1.00 1.02 62.0
    0.625 L5/8 1.50 1.10 0.71 1.09 1.06 35.4
    0.625 L5/8HI 1.50 1.42 1.02 1.09 1.06 70.8
    0.750 L3/4 1.77 2.30 1.91 1.36 1.28 89.2
    0.750 L3/4HI 1.77 2.30 1.91 1.36 1.28 129.1
    0.875 L7/8 2.36 2.83 2.24 1.85 1.61 106.7
    0.875 L7/8HI 2.36 2.83 2.24 1.85 1.61 142.2
    1.00 L1 2.36 2.83 2.24 1.85 1.65 106.7
    1.00 L1HI 2.36 2.83 2.24 1.85 1.65 142.2

    For best functionality and long lasting performance use White Assembly Paste see page Accessories.