PIETRO FIORENTINI NORVAL, Инструкция по установке, пусконаладке и обслуживанию

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TECHNICAL MANUAL MT044
29
5.5
COMMISSIONING THE REGULATOR PLUS NORVAL IN-LINE MONITOR WITH
INCORPORATED I-N SLAM-SHUT VALVE
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 pro-vided theaded 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 it.
• 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 or 13
clockwise and vice versa to reduce them.
- check proper operation by repeating the operations at least 2-3 times.
Fig. 16