PROBLEM
CAUSE
SOLUTION
THE VALVE
DOES NOT OPEN
Low inlet pressure.
Check the pressure or apply a higher inlet
pressure.
Pilot spring
5
is insufficiently compressed.
Turn the pilot calibration screw
5
clockwise until the valve opens.
Insufficient water demand.
Check the water demand or make it
increase.
Ball valves
4 – 8
are closed.
Open ball valves
4 - 8
.
THE VALVE
DOES NOT CLOSE
Circuit strainer
2
is clogged.
Clean the strainer
2
.
Ball valves
1 - 4
closed.
Open ball valves
1 - 4
.
Pilot spring
5
is excessively compressed.
Turn the pilot calibration screw
5
counter-clockwise until the valve closes.
Residues in the main valve.
Remove and inspection the actuator.
Inspection the disc gasket and the seat.
The main valve diaphragm leaks.
Close the ball valve
1 - 4 - 8
and remove
the plug from the cover. If the diaphragm
continues leaking it must be substituted
because it has been damaged.
WARNING: The valve will open
completely.
THE VALVE
DOES NOT REGULATE
Swings.
Slowly calibrate the needle valve
3
until
the swings stop.
Air in the upper part of the valve.
Loosen the cover connections, let the air
escape and tighten the connections again.
PLEASE NOTE: While working, ball valves
1 - 4 - 8
must be OPEN.
While cleaning the strainer
2
ball valves
1 - 4 - 8
must be CLOSE.
15. Troubleshooting
ACMO-AVK | IOM Manuals
ACMO-AVK_IOM_879-M100_00-20200520
13
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.
