GESTRA TK 23, Оригинальная инструкция по установке

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27
Example
This example shows how to determine the
minimum flowrate for equipment with DN 65 or DN
80.
The charts shown in this example are reduced in
size. Use the charts in original size to ascertain the
required setting.
A minimum flowrate of 6.5 t/h for hot fluid and a
differential pressure of 1.5 bar is desired.
Using the capacity chart for hot fluid you can
determine that for a differential pressure of 1.5 bar
the factory-set flowrate is 31 t/h.
This yields a ratio of (6.5 × 100)/31 = 21%.
According to the lift-restriction chart a ratio of 21%
(line "B") corresponds to 2¾ turns to the right of
the adjustment screw.
 Make sure that the equipment is depressurized,
cooled down to room temperature and free from
fluid.
 To reduce the pressure through the bore in the
cover slowly loosen the sealing plug by two
turns (10).
 Remove the lower cap nut (1).
 Remove the outer gasket (26) from the lower
adjustment screw.
 Remove the hexagon nut (25).

Remove the inner gasket (26) from the lower
adjustment screw.

Screw out the adjustment screw (12) until a
resistance is felt.

Screw in the lower adjustment screw (12) by the
number of turns specified in the chart.