Ultimo aggiornamento: 15/11/19
5
TROUBLE SHOOTING
PROBLEMS
PROBABLE CAUSE
REMEDY
The valve is noisy.
Nozzle with very small flow factor (< 03).
Too much water in the bypass unloading.
Size the nozzle according to the flow of the
pump in order to decrease the water
unloading in the by-pass.
At gun opening much time is required to
reach working pressure.
Delivery hose very long or big level difference
between valve and gun.
Nozzle with very small flow factor (< 03)
Throttle bypass unloading.
See section:
DISCHARGE SYSTEM AND WATER
ADDUCTION
At gun closure the valve pulses (rearm). Flow rate of the pump pulsating.
Check the pump.
Delivery hose too short.
Provide a longer hose.
The pump is sucking air in.
See section:
DISCHARGE SYSTEM AND WATER
ADDUCTION
At gun closure the valve pulses (rearm) Big leakage from the gun
Leak from delivery line
Eliminate the leakage
At gun opening the valve does not go
under pressure and continues to
unloading into the bypass.
Delivery hose very long or big level difference
between valve and gun.
Nozzle with very small flow factor (< 03)
Throttle bypass unloading.
See section:
DISCHARGE SYSTEM AND WATER
ADDUCTION
At gun closure, the valve does not
lower the pressure on the delivery line.
Orifice of the shutter blocked
(pos.33 on exploded view).
Clean and eliminate obstruction.
Valve does not reach maximum
pressure.
Worn nozzle.
Replace
Presence of matter between seat and shutter
Clean the seat
Seat damaged or worn
Replace
Valve does not go into pressure.
O-rings of Sst piston (pos. 8-9-10 e 13-14-15 of
the exploded view ) ruined.
Replace
MAINTENANCE
STANDARD: every 400 working hours, check and lubricate the seals with water resistant grease.
SPECIAL: every 800 working hours, check the wear of the seals and internal parts and, if necessary, replace with original PA parts
taking care, during installation, to lubricate with water resistant grease.
The maintenance must be carried out by specialized technicians.
The manufacturer is not to be considered responsible for damage as a result from incorrect fitting and maintenance
.
REGULATIONS
For a correct utilization, follow the directions as described in this manual and re-print them on the Use and maintenance of the machine.
If needed, ask for the original Conformity Declaration for the accessory chosen. The present manual is valid for all unloader valves
named
VB 40/1000 Zero
.
Technical data, descriptions and illustrations are indicative and liable for modification without notice.
Instruction manual, maintenance, installation, spare parts.
For a correct utilization, follow the directions of this manual and
re-print them on
the
Use and Maintenance booklet of the machine.
n. MPA.0004.EN
