Adjustments And Test - GMV NGV A3 Installation, Use And Maintenance Manual

4 ADJUSTMENTS AND TEST

4.1 ADJUSTMENT OF THE OVERPRESSURE VALVE (OPP/MPS)
S1
PAM
ï
VSMA
To adjust the overpressure valve:
1. Refer to the hydraulic circuit of the NGV valve
2. Close the ball valve (B), the lever must be found to 90° regarding the ball valve
3. Open the manometer shut-off valve (4)
4. Unscrew and remove the protection cap of the adjusting screw of the overpressure valve (1)
5. Loosen the locknut (1)
6. Start the motor-pump group
7. Start the 9.1 Overpressure Value control procedure on the PT01 programmer (please refer to the
Programming chapter)
8. Read the pressure on the programmer PT01
9. If the read value is different then the calibration one:
· Press the manual lowering button (ML) in order to decrease the pressure on the valve block
· Screw the adjustment screw 1 for increase the pressure on the MPS; unscrew the adjustment screw 1 for
reduce the pressure.
· Start the motor-pump group
· Start the Overpressure Value control procedure on the PT01 programmer
· Read the pressure on the programmer
· Repeat this procedure until the pressure value on the programmer is the same than the calibration one
10. Tighten the locknut 1
11. Put back and tighten the protection cap of the adjusting screw (1)
12. Re-open the ball valve (B)
NGV A3
VALVE
I , U
NSTALLATION SE AND
V NGVA3
ALVE
PT
B
S3
ML
S2
5
3
1 0991 483 EN - 21.12.2011
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1.05
P PT01
ROGRAMMER
ENG