18
MT 237 – EN ed.2015 (Rev.A)
6.4
MAINTENANCE WRENCHES FOR THE SLAM-SHUT VALVE DILOCK
7.0
FINAL OPERATIONS
7.1
TIGHTNESS AND CALIBRATIONS CHECK
1.
Open very slowly the on/off valve positioned at the inlet of the valve and, using a foamy solution, check the following:
tightness of the valve internal and external surfaces;
tightness of the slam-shut valve
2.
Operating very slowly, pull the bushing of the slam-shut valve until opening only the internal bypass. Then when pressure has
equalised, pull until the coupling is latched position;
7.2
COMMISSIONING
1.
Open very slowly the downstream on/off valve.
