PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

Страница: 30 / 59

TECHNICAL MANUAL MT044
30
B) On devices without the "push" valve (fig. 15) we recommend connecting the control head separately to a
controlled auxiliary pressure and repeat the operations described above.
ATTENTION
At the end of the operation, reconnect the control head to the downstream pressure take-off.
N.B.: The intervention tests should be repeated at least every 6 months.
At the end of the slam-shut check, proceed as follows:
1) ensure that the slam-shut is in the closed position;
2) disconnect the sensing line of the main regulator 2 and appropriately plug the connection fitting on the
downstream section;
3) very slowly open the on/off valve V1;
4) very slowly open the slam-shut by turning the provided lever;
5) check on the pressure gauge 5 that the downstream pressure is at the set-point established for the monitor
1, taking account of the closing overpressure;
6) open the bleed cock 6;
7) check on the pressure gauge 5 that the downstream pressure has the established setting value. If it does not,
adjust the setting by means of the special screw 74, turning it clockwise to increase its value and
anticlockwise to reduce its value;
8) trip the slam-shut manually;
9) connect the sensing line of the main regulator;
10) very slowly open the slam-shut valve by turning the provided lever;
11) check on the pressure gauge 5 that the downstream pressure settles at the set-point established for the main
regulator 2, taking account of the closing overpressure;
12) open the downstream bleed cock;
13) check on the pressure gauge 5 that the downstream pressure has the established setting value. If it does not,
adjust the setting by means of the special screw 74, turning it clockwise to increase and anticlockwise to
reduce;
14) close the bleed cock and check the value of the closing pressure;
15) check the tightness of all the joints between the on/off valves V1 and V2 using a foam medium;
16) very slowly open the downstream on/off valve V2, until the line is completely filled.
17) check that when you operate the slam-shut manually, the flow in the line stops.