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MT 235 – EN ed.2015 (Rev.A)
7.5
WRENCHES FOR THE MAINTENANCE OF PRESSURE REGULATORS DIVAL 500 (+LA…)
8.0
FINAL OPERATIONS
8.1
TIGHTNESS AND CALIBRATIONS CHECK
1.
Open very slowly the on-off valve positioned at the inlet of the regulator and, using a foamy solution or the alike,
check the following:
tightness of the regulator external surfaces;
tightness of the slam-shut valve;
tightness of the regulator internal surfaces;
2.
Operating very slowly, pull the bushing of the slam-shut valve until opening only the internal bypass. Then when
pressure has equalized, pull until the coupling is latched position;
3.
Check the tightness of the reinforced gasket of the regulator;
4.
At regulator outlet, open a vent valve able to create a small gas flow rate;
5.
Screw the internal adjustment ring nut until reaching the desired calibration value;
6.
Close the vent valve venting to the atmosphere;
8.2
COMMISSIONING
1.
Very slowly open the outlet on-off valve and if necessary, adjust the ring nut, to ensure the correct outlet pressure if
the regulator.
2.
Tighten the plug
