OPEN
valve static test:
1.
Close ball valves
1 - 4 - 8
to isolate the pilot control system. This prevents impurities from
entering the control circuit.
2.
Fully open the main valve by removing the cap on the cover or by loosening a junction or
opening ball valve
4
.
WARNING: Check this procedure does not cause any damage to the pipeline.
3.
Check that the flanged junctions, pipe fittings, etc. do not leak.
4.
Reassemble the cap on the cover and/or tighten the junctions.
CLOSE
valve static test:
1.
Close the ball valve
8
, located upstream of the pilot, and open ball valves
1 - 4
.
2.
Release the air under the cover of the main valve loosening the junction situated in the highest
point of the cover. Tighten the junction. This will keep the valve shut when the pipeline is
pressurized.
3.
Check the cover does not leak, in case, tighten the fixing bolts.
WARNING: A constant flow in the system is necessary to start and calibrate the automatic
control valve. Open a hydrant, a pressure relief valve, a by-pass etc. to ensure a constant water
flow in the system.
1.
Close and open the ball valves as explained before to close the main valve.
2.
The needle valve
3
has been calibrated in our factory. To reduce the opening speed of the
hydraulic valve, turn needle valve
3
clock wise. Vice versa to increase it.
3.
Turn the calibration screw, situated on the pilot valve
5
, counter–clockwise until the spring loo-
sens completely. Open ball valve
8
: the main valve will stay closed if the downstream pressure
is higher than the minimum pressure of calibration of the pilot.
4.
How to regulate the pressure reduction:
4.1.
Slowly, turn the pilot regulator screw
5
and clockwise until the main valve starts opening.
Keep on turning the calibration screw slowly stopping at each half rotation to let the valve react.
Select the downstream pressure according to the pressure indicated on the pressure gauge
6
.
Tighten the lock nut on the regulator screw.
4.2.
To check the valve functioning, increase the downstream pressure using other devices.
The valve should close slightly keeping the downstream pressure constant.
11. Static tests once installed
12. Commissioning
ACMO-AVK | IOM Manuals
ACMO-AVK_IOM_879-M100_00-20200520
11
ACMO-AVK CONTROL VALVE SERIES 879
879/BB0X99 - M100 PRESSURE REDUCING VALVE
The designs, materials and specifications shown are subject to change without notice. This is due to the continuous development of our product programme.
Unauthorized use is forbidden.
