15
MT 237 – EN ed.2015 (Rev.A)
6.2
MAINTENANCE PROCEDURE FOR THE SLAM-SHUT VALVE DILOCK
Procedure for disassembling, completely replacing the spare parts and re-assembling the DILOCK slam-shut valve.
PRELIMINARY OPERATIONS
1.
Bring the valve to its safety status.
2.
Make sure that the pressure upstream and downstream of the same is zero.
DISASSEMBLING AND RE-ASSEMBLING
6.3
DISASSEMBLING
1.
Make sure that the slam-shut device is in closed position;
2.
Disconnect the fittings between the slam-shut valve and the downstream pressure sensing line;
3.
Remove the screws that secure the slam-shut device to the body;
4.
Remove the slam-shut device
5.
Unscrew the plug and the adjustment ring nuts. Then remove the calibration springs and the spring supports;
