2
BA VALVE
4. Maintenance
Keep the backflow preventer clean, and
free of dirt.
Do not expose the backflow preventer
to frost.
5. Disposal
7. Technical data
6. Troubleshooting
Disposal of the backflow preventer
is according to local requirements.
Contact your local dealer or authorities
for further information.
Problem
Cause Remedy
The backflow preventer
does not open for water
flow
• Pressure/flow is too low
• The backflow preventer
is not mounted correctly
• Mount a hose of 10/12
meters. The inlet water
pressure must be above
1.5 bars.
• Follow the instructions
and mount the backflow
preventer correctly
Release valve opens
without reason
• The pressure is too low
• Check the water pressu-
re from the water tap
Release valve stays open
• Pressure too low
• Damaged content
• Check the backflow pre-
venter and the pressure
from the water tap
• If the backflow preventer
leaks it might be defect
The BA valve leaks when
closing the pistol
• The water hose is not
long enough
• Increase the length of
the hose
The water volume through
the hose is too low.
• The pressure loss when
using a backflow pre-
venter is 0.6-0.7 bar
• The inlet water pressure
must be above 1.5 bars.
The pressure in the hose
is to high (leaks, bursts)
• The hose is too short
• Increase the length of
the hose
Weight
0.170g
Dimensions
(Max.)
55 x 95 x 155mm
Thread and hose length
• Up to 600 l/h
½ inch/10 meter
• Above 600 l/h
3/4 inches/12 meter
Min. pressure during operation
1.5 bars
Max. pressure (30
o
C/65
o
C)
10 bars/6 bars
Max. operating temperature
65
o
C
Materials
(House and valve gas-
kets)
• POM
• Stainless steel
• EPDM/NBR
Standards and norms
- IEC/EN 60335-2-79 Amend.2.
- Construction according to EN 1717
Adapted products
High pressure cleaners and professional steam
cleaners
Accessories
For unformations about couplings, filters and ho-
ses visit: http://www.nilfisk.com
At least once a year, check the function
as follows:
1.
After work, switch off the high
pressure cleaner.
2.
Close the water tap valve.
3.
Release the pressure in the supply
hose by triggering the spray pistol.
4.
Dismount the backflow preventer.
Water has to come out of the drain
opening (max. 100ml) to ensure
separation of the potable water (c).
5.
If this is not the case, contact your
Nilfisk representative.
See 7. Technical Data for further infor-
mation on materials.
