Kemper 361 Installation And Operating Instructions Manual
Installation and operating instructions
KEMPER Backflow Preventer BA Figure 361
1. Prerequisites for installation
Install the backflow preventer in
frost-free areas only! DIN EN 1717, DIN 1988
Comply with standards: DIN EN 12056, DIN 1986-100
Provide a drain line! Comply with the direction of flow!
Application area
According to DIN EN 1717, in order to maintain flawless functioning of the BA backflow preventer, a flanged dirt trap
must be installed in the direction of flow before the BA backflow preventer. Type BA backflow preventers that accord
with DIN EN 12729 are used to secure drinking water plants against back pressures and siphon back flow. Fluids up to
and including Fluid Category 4 as per DIN EN 1717/1988-100 are secured. They can be used for residential buildings,
industrial and commercial purposes with consideration of their specifications. Normally (normal functioning with pressure
fluctuations), the vent hole of the middle pressure chamber only allows a few drops through. During malfunctions,
the vent hole can allow the full volume flow of the service pipe through. For that reason, dimension the wastewater
connection to be sufficiently large according to DIN EN 12056 and DIN 1986-100. Assume the volume flow that could arise
through the service pipe on the backflow preventer BA (pay attention to the nominal flow rate!).
BA can secure the following hazard potential in accordance with the Fluid Category:
Category 4 (applies to backflow preventer BA)
Fluids that present a health hazard to humans due to the presence of one or more toxic or highly toxic substances or
one or more radioactive, mutagenic or carcinogenic substances.
The higher the classification, the greater the risk potential. For each category, DIN EN 1717 stipulates specific protection
valves. The Backflow Preventer BA, Figure 361 is approved without restriction for use up to and including Category 4. A
continual bacterial risk (Fluid Category 5) in extant piping systems must not exist.
2. Operating principle
The KEMPER BA Backflow Preventer is subdivided into 3 zones. In Zone 1, the pressure is higher than in Zone 2 and there
again higher than in Zone 3. A drain valve is connected to Zone 2, which opens latest when the pressure difference between
Zones 1 and 2 has decreased to less than 0.14 bar. The water from Zone 2 flows outdoors. That precludes the risk of backpressure or siphon back flow in the supply network. The pipeline is interrupted and the drinking water network is protected.
Intermittent dripping from the BA Backflow Preventer at the drain valve is not necessarily a malfunction.
Under such circumstances, the BA Backflow Preventer separates as intended!
The backflow preventer
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p
p
Note:
Do not connect any fast-closing valves or stopping equipment before or after the valve.
Fast closing, e.g. of solenoid valves or ball valves on devices and machines can lead to serious malfunctions in the
backflow preventer BA. For that reason, always use slowly closing valves or drives that close slowly.
If the inlet-side static system pressure is high, it is recommended to install a pressure reducing valve in the
supply line.
Zone 2
Zone 1
Supply-side anti-
ollution check-valve
Figure 1: Sectional view
Dimension
Nominal width DN 65 80 100 150
Installation height (H) mm 245 245 245 285
Installation height (h) mm 270 270 300 300
Installation depth (D) mm 60 60 60 60
Length (L) mm 559 559 559 695
Nominal flow at delta p=1 bar m³/h 45 54 85 191
Weight kg 31.3 32.6 34 52.6
Table 1: Dimensions: Backflow Preventer BA Figure 361
Drain valve
Discharge-side anti-
ollution check-valve
Zone 3
3. Installation
The BA Backflow Preventer must be installed level. Provide cut-off valves in front of and behind the backflow preventer.
In addition, a dirt trap must be connected upstream which prevents the backflow preventer from damage and functional
impairments due to coarse dirt.
Install the backflow preventer free of tension and without flexural moment as follows:
1. Thoroughly rinse connecting pipe
2. Check connections on backflow preventer for cleanliness (Figure 2)
3. Install backflow preventer as in Figure 3. While doing so, comply with the following points and those in Chapter 3.1:
Flow in direction of arrow
Maintain installation clearances
Make sure there is good accessibility
Make drain lines without any tight bends and keep them short. Connection dimension acc Table 2
Install the drain line so that the drain connection and the drain valve can be removed for inspection.
A material-steadying zone of 5 x DN after the BA is recommended
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Figure 2:
Connection area
Figure 3: BA Backflow Preventer protection device with installation prerequisites and dimensions.
Connection sizes 65 80 100 150
A 650 650 650 650
B 600 600 600 600
C 160 160 160 200
D 150 150 150 150
E 345 345 345 375
F 895 895 895 935
G 75 75 75 75
(Dimensions in mm)
Table 2: Dimensions for installation prerequisites
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3.1 Notes for secure installation
If there are supply pressure fluctuations, without water removal a short triggering of the drain valve can occur. For that
reason, we recommend installing a pressure reducing valve before the backflow preventer.
The room in which the backflow preventer is installed must be freely accessible at all times and always be frost free. Ensure
good ventilation.
If the drain line is also being used by other equipment/plants, it must be correspondingly dimensioned (pump
stations/sewage system)
No additional, unprotected drinking water connections are permitted after the backflow preventer.
Within the downstream system, the individual connections are not secured from each other against backflow. If required,
provide individual protection.
The backflow preventer must be easily accessible at all times. Manometer connections and controls must not be obstructed.
While installing backflow preventers, make sure the water that leaks during the separation process is safely drained off.
Installation in shafts and rooms endangered by flooding is prohibited. For inspection and maintenance reasons, provide
cut-off valves in the direction of flow before and after the backflow preventer.
The backflow preventer must be installed flood proof.
Provide the drain valve control with an effective safeguard, i.e., in case of failure, the vent hole opens completely. In this
case, for 1 bar pressure in the middle chamber, calculate with the following dimensions. Dimension the dewatering line
correspondingly.
Hydraulic values
DN 65 80 100 150
m³/h 35 35 35 35
Table 3: Drain lines (sewage system connection dimensioning)
4. Commissioning
Commission the backflow preventer in this sequence:
1. Slowly open cut-off valves 1 and 2.
During this process, it is possible the drain valve opens intermittently.
2. Vent the system through ball valves 3, 4, and 5.
Open each ball valve until water comes out. It is important to open every ball valve to make sure that all chambers are
vented.
3. The backflow preventer is ready for operation.
Figure 4:
Commissioning the BA Backflow Preventer
safeguards
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