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Field of application
The Backflow Preventer 6600 BA Mini (or RPZ Valve) is designed to
protect potable water against non potable water up to and including
fluid category 4 in compliance with EN 1717. According to the instruc-
tions in the national annex to EN 1717 dealing with the selection of
safety devices, the use of a BA Backflow Preventer is compulsory for
the following appliances and draw-off points in domestic and non-
domestic systems.
Softeners / ion exchangers, regeneration
Swimming pools and bathtubs with water treatment
Bath lifters, openings and operational parts above bath rim
Galvanic bath
Sterilizing of water through disinfection
Chemical mixing facilities (disinfectants or fertilizers)
Chemical cleaning system
Film developers
Printing, reprographics, photographic equipment
Filling system for heating installations (water with inhibitors)
High pressure cleaners with addition of chemical substances
Laboratory benches, chemical laboratories
Softeners / Ion exchangers, formalin disinfection
Design
The BA Backflow Preventer is designed as follows:
Casing
Integral strainer, mesh width about 0.25 mm
Cartridge with integral check valve and drain valve
Check valve at the outlet
3 ball valves to connect a differential pressure gauge
Threaded unions
Drain connection
Available with or without stop valves
Materials
Body made of gunmetal
Cartridge of high-quality synthetic material
Check valve made of high quality synthetic material
Ball valves made of brass
Sealing elements made of NBR and EPDM
Internal parts of high quality synthetic material / brass
Drain connection of high quality synthetic material
Technical specifications
Connection:
R ½" + ¾"
Nonimal size:
DN 15
Medium:
potable water
Upstream pressure:
max. 10 bar
Min. inlet pressure:
1,5 bar
Mounting position:
horizontal, drain facing downwards
Service temperature:
max. 65 °C
Drain pipe connection:
DN 40
Flow rate:
2,0 m³/h, ∆p 1,5 bar
Function description
The BA Backflow Preventer (Reduced Pressure Zone Valve) from
SYR includes all components set by EN 1717 and is designed as 3
pressure-zone-system with a controllable upstream, intermediate and
downstream pressure zone. Each pressure zone is equipped with ball
valves allowing to check each zone and to ensure the leaktightness
of the safety devices by pressure measurement. The BA Backflow
Preventer is equipped with 2 consecutive check valves with an in-
termediate pressure zone in between, which can be vented to the
atmosphere. When no water is drawn off, the check valves on either
side and the drain valve are closed. In case of back-siphonage, the
inlet pressure drops. The drain valve opens at the latest, when the
differential pressure between the upstream and intermediate zone
decreases to 0.14 bar. An optical indicator allows quick and easy
verification of the Backflow Preventer's status.
1
Upstream pressure zone
1
Intermediate pressure zone
2
3
Downstream pressure zone
4
Tundish
Installation
Thoroughly flush the pipe prior to installation. When using the model
without shut-off valves, service valves shall be provided either side
of the Backflow Preventer. Mount the device in the pipe with the drain
valve facing downwards to ensure a perfect operation of the tundish.
Free access to the Backflow Preventer shall be provided to facilitate
maintenance works and the inspection. Do not install the device in
locations liable to frost and flooding. It should only be mounted in a
well-ventilated environment. The drain pipe's diameter shall be able
to accommodate the maximum discharge volume. We recommend
installing a potable water filter according to EN 13443, part 1 upstream
of the Backflow Preventer in order to ensure its perfect and durable
operation. Once installed, vent the device by means of the 3 ball valves.
Then, the Backflow Preventer is ready for operation.
When connecting the tundish to the sewer, comply with the require-
ments set in the standard EN 12056.
Only when designed with a synthetic body:
Use the enclosed adaptor when mounting a pressure gauge or a
test port on the backflow preventer's pressure gauge connection for
maintenance purposes, otherwise the synthetic body might become
damaged by a possibly sealed manometer.
Remove the manometer plug (2), fit the pressure gauge in the adaptor
and then screw the adaptor with the manometer in the body until hand-
tight. Any R ¼" pressure gauge can be used for the connection of a
manometer to the adaptor.
Caution: Do not seal the adaptor!
Maintenance
According to EN 1717, the Backflow Preventer has to be serviced on a
regular basis. Therefore maintenance agreements between user and
installer are very useful. The correct function has to be verified after the
first service year and then periodically in accordance with the operating
conditions, but every year at the latest. The ball valves in each pres-
sure zone allow to check the correct operation of the valve by means
of the pressure gauge (accessories; service kit art. no 6600.00.902).
The Backflow Preventer is designed with a cartridge system, which
makes the regular maintenance works simple and unproblematic.
1221 - Printed in Germany
Isolate the system and the potable water Mains by means of the
shut-off valves upstream and downstream of the Backflow preventer
and depressurize the system. Unscrew the Top of the BA-cartridge by
using the maintenance key and remove the cartridge. Unscrew the two
threaded connections above the system separator. Extrace the strainer
upwards out of the inlet connection of the Backflow preventer. Rinse
the removed Parts under clear, running water. After the reassembly
3
Open both isolating valves.
Verification of the disconnection of the discharge
valve and the secondary check valve
•
To check the discharge valve, close both shut-off valves 4a + 4b.
2
•
Remove the manometer plugs at the service valves 1+2.
Attention: For the synthetic version please use the adapter.
•
Open the service valves 1+2 to depressurize the device.
•
Mount the pressure gauge's needle valves on the service valves
1+2.
•
4
Fit the pressure gauge.
•
Open both shut-off valves 4a + 4b.
•
Vent the device by means of both needle valves. Close them again.
•
Close the shut-off valves 4a + 4b.
•
Relieve the pressure slowly by means of the needle valve 1.
•
Watch the tundish. When the first drop comes out of the tundish,
the diff. pressure shall exceed 140 mbar. If it is not the case, dirt
has accumulated in the device or there is a mechanical defect.
•
Open the needle valve 1 and discharge the intermediate pressure
zone until completely drained.
•
To verify the secondary check valve (RV2), open the outlet shut-off
valve (4b). Should water drip from the tundish, there is probably a
mechanical defect or dirt has accumulated in the secondary check
valve.
•
Close both service ball valves 1+2.
•
Remove the measuring device and put the manometer plugs back
in their position on the service valves.
•
Open both shut-off valves (4a + 4b).
4a
1
9.6600.XX
3
4b
service valve
1
inlet pressure zone
service valve
2
2
intermed. press. zone
pressure gauge
3
5
primary stop valve
4a
secondary stop valve
4b
drain valve
5
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