PIETRO FIORENTINI HBC 975, Manual

Page: 69 / 156

69
HBC 975
Use, maintenance and warning manual
SLAM-SHUT VALVE | COMMISSIONING | REV. 00
EN
Step Action
1
Press and hold the button of the bypass valve HP2/2 (7.1) to:
• bring the upstream pressure to the LINE-OFF 2.0 power supply unit;
• balance the pressure of the HBC 975 built-in slam-shut valve plug.
2
Release the button of bypass valve HP2/2 (7.1) after checking that the upstream and downstream pressure
of the slam-shut valve is balanced.
3
Turn the adjustment screw of the R44/SS regulator (7.5) clockwise and tighten it until reaching the tripping
value (6 bar) of the safety valve VS/FI (7.6).
NOTE!
Check the pressure, referring to the pressure gauge (7.3) connected to the R44/SS regulator.
4
If the safety valve VS/FI (7.6):
• opens before the expected pressure value, unscrew the locking ring nut and tighten (clockwise) the adjust-
ment plug so that the spring inside it is further compressed;
• does not open at the expected pressure value, unscrew the locking ring nut and loosen the adjustment
cap anticlockwise, so as to release the spring inside.
5
Check the VS/FI valve (7.6) for correct calibration:
• decreasing the pressure by acting on the adjustment screw of the R44/SS regulator (7.5);
• increasing the pressure until the VS/FI valve (7.6) trips by acting on the adjustment screw of the R44/SS
regulator (7.5).
6
Repeat step 5 at least three times to properly calibrate the VS/FI safety valve (7.6).
7
By acting on the adjustment screw, calibrate the R44/SS regulator (7.5) to the required pressure value (min. 4
bar, max. 5 bar) referring to the connected pressure gauge (7.3), then:
• if the pressure value on the pressure gauge is lower than the set value of the R44/SS regulator (7.5): tight-
en the adjustment screw clockwise so as to further compress the spring inside it;
• if the pressure value on the pressure gauge is higher than the calibration value of the R44/SS regulator
(7.5): unscrew the adjustment screw anticlockwise so as to further release the spring inside.
8
Press the button of bypass valve HP2/2 (7.1) and check that the upstream and downstream pressure is bal-
anced.
9 Release the HP2/2 bypass valve button (7.1).
10 Trigger the HBC 975 slam-shut valve by operating the lever (7.9).
Tab. 8.43.