108
REV
AL 182
EN
Use, maintenance and warning instructions
MEDIUM PRESSURE REGULATOR
|
COMMISSIONING
|
REV. 00
8.9.1 - CALIBRATION PROCEDURE FOR PRESSURE SWITCHES MOD. SA
Fig. 8.37.
Calibration of pressure switches mod. SA
SPRING CALIBRATION FOR MAXIMUM PRESSURE TRIP
Step
Action
1
Increase the downstream pressure to the slam-shut valve's cut-out value by turning the main regulator's pilot
adjustment screw to check that the setting is correct.
NOTICE!
Check the pressure referring to the pressure gauge (fig. 8.32, 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
By opening the drain cock (fig.8.32, ref. 6), decrease the pressure in the downstream section to the calibration
value of the main regulator.
3
Close the drain cock (fig. 8.32, ref. 6).
4
Reset the slam-shut device by adjusting the reset lever (16).
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. 8.77.
Summary of Contents for REVAL 182
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