5.11.4 Pressure Regulator - Riello RL 800/M TC FS2 Instrucciones De Uso

5.11.4 Pressure regulator

Calibration pressure on return line
With a servomotor position of 20°, the nut and the corresponding
lock nut 6)(Fig. 18), are fixed in contact with the eccentric 8).
During the rotation towards 130° of the servomotor, the eccentric
will push the modulator shaft, taking the pressure, read on the
pressure gauge 3)(Fig. 18), to the desired value.
To calibrate the eccentric, proceed as follow:
 loosen the screws 7), and act on the screw 4) to obtain the
desired eccentricity.
 Turn clockwise (+) the screw 4) to increase the eccentricity,
increasing the difference between the min. and max. capac-
ity of the nozzle.
 Turn anticlockwise (-) to decrease the eccentricity and, con-
sequently the difference between the min. and max. capacity
of the nozzle.
Calibration pressure on delivery line
To adjust the delivery pressure, operate on the pump as de-
scribed on page 20.
Example:
if you use a 650 kg/h nozzle and you want to obtain power of 6650
kW, the pressure on the pressure gauge 3)(Fig. 18) (maximum
pressure on return circuit) must be about 16.5 bar.
Relevant delivery pressure read on the pressure gauge 2), must
be 20 bar (see Table A on page 16).
IMPORTANT
 The proper setting of the eccentric 8) is possible when its
operation field follows the servomotor operation field (20° ÷
130°): so, that every variation of the servomotor position cor-
responds to a pressure variation.
 Never let the piston batter: the stop ring 5) determines the
max. stroke.
 If you wish to check the delivery capacity of the nozzle, pro-
ceed as follows:
open the burner according to instructions at page 15, place
the nozzle, simulate the start-up and then proceed with the
weighing at the maximum and minimum pressures.
 If at maximum capacity of the nozzle (maximum pressure in
the return line) pressure fluctuations are detected on the
manometer 3), slightly decrease the pressure till their com-
plete elimination.
NOTA:
the burner is calibrated from factory with maximum pressure on
the return line of approximately 16.5 bar and delivery pressure of
approximately 20 bar.
Installation
8
7
D8369
6 5
Key to layout (Fig. 18)
1 Maximum oil pressure switch
2 Manometer for pressure in delivery line
3 Manometer for pressure in return line
4 Eccentric adjusting screw
5 Ring for piston stop
6 Nut and lock-nut for piston setting
7 Eccentric locking screws
8 Variable eccentric
19 GB
4
1
3 2
Fig. 18
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