PIETRO FIORENTINI Dival 600, Руководство пользователя

Страница: 85 / 156

85
DIV
AL 600
Use, maintenance and warning instructions
MEDIUM PRESSURE REGULATOR | COMMISSIONING | REV. A
EN
SPRING CALIBRATION FOR MINIMUM PRESSURE TRIP (IF PRESENT)
Step Action
1
Partially open the bleed cock (fig. 8.16, ref. 6) to the atmosphere and keep it open for the next steps.
2
2
Turn the adjustment ring nut (fig. 8.16, ref. 3) of the regulator anti-clockwise to decrease the downstream pres-
sure (Pd) to the minimum pressure required for tripping of the slam-shut valve.
3
3
If necessary, remove the closing cap (fig. 8.21, ref. 354) together with the adjustment ring nut and remove the
regulation spring (fig. 8.21, ref. 328).
NOTICE!
Check the tripping pressure value of the slam-shut valve indicated on the downstream pressure
gauge (fig. 8.19, ref. 5).
4
4
If the slam-shut valve:
• trips before the expected pressure value, unscrew (anticlockwise) the adjustment ring nut (fig. 8.20, ref.
15), to relieve the spring (fig. 8.20, ref. 17);
• does not trip at the expected pressure value, screw in (clockwise) the adjustment ring nut (fig. 8.20, ref.
15) to further compress the spring (fig. 8.20, ref. 17).
5
5
After having checked that the slam-shut valve trips at the preset value, proceed as follows:
1. Close the air vent valve (fig. 8.16, ref. 6)
2. Position the regulation spring (fig. 8.21, ref. 328), the closing cap (fig. 8.21, ref. 354), and adjustment ring
nut (fig. 8.16, ref. 3)
3. Slowly open the upstream shut-off valve (V1) until the downstream pressure value (Pd) reaches the calibra-
tion value of the regulator, referring to the downstream pressure gauge (fig. 8.16, ref. 5)
4. Close the upstream shut-off valve (V1)
5. Slowly and partially open the air vent valve (fig. 8.16, ref. 6) to decrease the downstream pressure referring
to the downstream pressure gauge (fig. 8.16, ref. 5) until it reaches the minimum pressure tripping value
6. Check the minimum pressure spring for proper calibration by repeating steps 2-3-4 at least three times
7. Calibrate the main regulator referring to par. "8.5 - Regulator commissioning procedure"
6
6
Open the slam-shut valve by acting on the reset knob (fig. 8.20, ref. 16) and keep it open manually.
7
7
Turn the adjustment ring nut clockwise (fig. 8.16, ref. 3) to increase the downstream pressure to the regulator's
setpoint.
8
8
Set the slam-shut valve by acting on the reset knob (fig. 8.20, ref. 16).
9
9
Close the bleed cock (fig. 8.16, ref. 6).
Tab. 8.49
COMMISSIONING THE REGULATOR
NOTICE!
Please refer to "8.5 - Regulator commissioning procedure" of this chapter.