7
Fig. №. 6
DBV 1 - 02 Two-Way Safety Valve
A safety valve with the maximum overpressure of 400 kPa (4 bar), the dimensions of which have to comply to the nominal power of
the boiler, has to be installed in the system. The safety valve must be positioned directly behind the boiler. No shut-off valve can be
placed between the safety valve and the boiler. In case of other questions, please contact our contractual mounting companies and
service organizations.
Technical data of the DBV 1
– 02 two-way safety valve (from Regulus Company)
Opening temperature (limit):
100 °C (+0° - 5 °C)
Maximum temperature:
120 °C
Maximum pressure at the boiler side:
400 kPa (4 bar)
Maximum pressure at the water side:
600 kPa (6 bar)
Nominal flow rate at
p 100 kPa (1 bar):
1,9 m
3
/h
Usage
The DBV 1
– 02 two-way safety valve is destined for the protection of the central heating against overheating. The discharge and refill valve in
the valve body is controlled by a thermostatic block. When reaching the limit temperature, the discharge and refill valve is simultaneously
opened; it means that cool water flows into the boiler, and at the same time hot water is drained from the boiler. While lowering the temperature
under the limit one, the discharge and refill valve will be closed.
WARNING!!! It does not replace a safety valve
In case of triggering the two-
way safety device, when water which does not comply with requirements of ČSN 077401 can be refilled, it
is necessary to prepare water in the system so that it met the requirements of this standard.
Fig. №. 7
Recommended Wiring Diagram of the DBV 1 - 02 Two-Way Safety Valve
Installation
Only qualified person may perform installation. To ensure correction functionality of the thermostatic two-way safety valve, it is necessary to
follow prescribed conditions for its installation and respect marking of the flow rate directions marked on the valve body. The safety valve is
always mounted into the output pipeline of the boiler or directly on the boiler in a place of its upper part, where heated water leaves the boiler
and is conveyed into the heatin
g system. While installing the valve, it is necessary to check whether the use of the 3/4“ mouthpiece (which can
be either in the pipeline or on the boiler) ensures full submersion of the thermostatic module of the valve. After having mounted into the
mout
hpiece, connect the draining pipeline in the place „C“ (Fig. No. 6) in which hot water will outflow from the boiler. In the place „A“ (Fig. No. 6),
connect (according to Fig. No. 7) the cooling water supply line which - after putting the valve into operation - will ensure boiler cooling-down. It is
necessary to install a filter for capturing mechanical impurities on the cooling water supply line. In the place „B“ (Fig. No. 6), connect the pipeline
and - according to Fig. No. 7 - lead it into the return line of the system near the boiler.
Regular Maintenance
Once a year rotate the head of the safety valve to remove possible impurities deposited in it. Clean-up the filter on the cooling water input.
In the case of the use of an opened expansion tank, there is no need in a safety device against overheating.
Each heat source in the opened heating system has to be connected with an opened expansion tank which is situated in the highest point of the
heating system. Expansion tanks have to be dimensioned so that they can cover changes of the water volume which occurred as a result of
heating and cooling.
Opened expansion tanks have to be equipped with non-lockable de-aerating and overflow pipelines. The overflow pipeline has to be proposed
so that it reliably lead away the highest supply rate incoming into the system. It can be achieved by dimensioning of the overflow pipeline by one
DN higher than the feeding pipeline has. The expansion tanks and their connecting pipelines have to be designed and placed in order to reliably
avoid their freezing.
A
– cooling water input
B
– output into the boiler
C
– output into the sewage
D
– input from the boiler
1.
Boiler
2.
DBV 1 - 02 Two-Way Safety Valve
3.
Safety valve
4.
Pressure control valve
5.
Filter
6.
Ball-valve
7.
Pump
8.
Excessive heat removal
9.
Discharge valve
I.
– Cooling water input
II.
– Heating water output
III.
– Return water input
