96
ASX 176
EN
Use, maintenance and warning instructions
HIGH PRESSURE REGULATOR
|
COMMISSIONING
|
REV. 00
8.8.3 - PRESSURE SWITCH CALIBRATION PROCEDURE FOR LINE OFF 2.0 MODELS
102M/102MH TO 105M/105MH
11
13
17
15
10
16
Fig. 8.29.
Pressure switches calibration Models 102M/102MH - 105M/105MH
SPRING CALIBRATION FOR MAXIMUM PRESSURE TRIP
Step
Action
1
By adjusting the main regulator, increase the downstream pressure up to the tripping value of the slam-shut
valve, to check for proper calibration.
NOTICE!
Check the pressure referring to the pressure gauge (fig. 8.11, ref. 5) downstream of the main
regulator. If the slam-shut valve:
• trips before the expected pressure value: screw in (clockwise) the adjustment ring nut (13)
so as to further compress the spring (11);
• does not trip at the expected pressure value: unscrew (anti-clockwise) the adjustment ring
nut (13) so as to relieve the spring (11).
2
Decrease the pressure in the downstream section by opening the vent (fig.8.11, ref. 6) to bring it up to the
calibration value of the main regulator.
3
Close the vent (fig.8.11, ref. 6).
4
Reset the slam-shut device by adjusting the lever in the 3/2 valve (fig. 4.1, ref. 8).
5
Repeat steps 2-3-4 at least three times.
NOTICE!
The calibration value must comply with the operating limits specified on the plate.
Tab. 8.57.
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