PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

Страница: 25 / 59

TECHNICAL MANUAL MT044
25
5.4 COMMISSIONING THE REGULATOR WITH INCORPORATED I-N SLAM-SHUT
If there is also a relief valve in the line, refer to par. 3.1 to check it.
Check and adjust the intervention of the slam-shut 7 as follows:
A) For slam-shuts connected to the downstream piping by a three-ways deviator push valve 11, proceed as follows
(Fig. 14):
- connect a controlled auxiliary pressure to path C;
- stabilise this pressure at the set-point established for the regulator;
- insert a reference pin 2 in the notch, pressing the knob 1 completely;
- reset the slam-shut device by means of the provided threaded bushing;
- keep the knob 1 pressed and:
• for safety devices which intervene for maximum pressure: slowly increase the auxiliary pressure and
check the intervention value. If necessary, increase the intervention value by turning the adjustment ring
12 clockwise, or anticlockwise to reduce the intervention value.
• for safety devices which intervene for pressure increase and reduction: slowly increase the auxiliary
pressure and record the intervention value. Restore the pressure to the set-point established for the
regulator, and carry out the slam-shut reset operation.
Check intervention for pressure reduction by slowly reducing the auxiliary pressure.
If necessary, increase the intervention values for pressure increase or decrease by respectively
turning the rings 12 and 13 clockwise and vice versa to reduce them.
- check proper operation by repeating the operations at least 2-3 times.
Fig. 13