PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

Страница: 17 / 59

TECHNICAL MANUAL MT044
17
3.1.1 DIRECT INSTALLATION IN THE LINE (Fig. 5)
When the relief valve is fitted directly in the line that is, without the interposition of an on/off valve, we recommend
proceeding as follows:
1) ensure that the downstream on/off valve V2 and the bleed cock 6 are closed;
2) increase the pressure in the downstream section to the value at which intervention should occur by connecting
a controlled auxiliary pressure to the cock 6 and stabilise it at the desired value;
3)check intervention of the relief valve and adjust it if necessary by turning the internal adjustment ring 14
appropriately (clockwise to increase the set-point, anticlockwise to reduce it).
3.1.2 INSTALLATION WITH ON/OFF VALVE (Fig. 6)
1)Close the on/off valve 16;
2)connect a controlled auxiliary pressure to the take-off 17 and increase it slowly to the envisaged intervention
value;
3)check the intervention of the relief valve and adjust it if necessary by turning the internal adjustment ring 14
appropriately (clockwise to increase the set-point, anticlockwise to reduce it).
Fig. 6 Fig. 5