Technical information

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Usage
The two way safety vent DBV 1 – 02 is used as a protection of heating boilers against overheating. In the
valve body there is the bleed and supply valve controlled by thermostatic element. When the limit
temperature is reached, the bleed and supply valve is simultaneously opened meaning that the cold water is
running in and the hot water is running out. When the temperature drops below limit, the bleed and supply
valve is simultaneously closed.
Caution! It is not a compensation for safety valve.
In case of two way safety vent reaction, when there is a possibility of boiler having been filled with
the water, which does not meet the ČSN 077401 requirements it is necessary to change the water in
the heating system so that it meets the ČSN 077401 requirements again.
Fig. no. 9 The two way safety vent DBV 1 - 02
1 – Boiler
2 – Two way safety vent DBV 1 – 02
3 – Safety valve
4 – Transforming valve
5 – Filter
6 – Ball-shaped cock
7 – Pump
8 – Surplus heat removal
9 – Bleed valve
I – Cooling water inlet
II – Heating water outlet
III – Return water inlet
Fig. no. 10 The recommended scheme of the two way safety vents DBV 1 – 02 connection
It is necessary to install a safety valve for maximum overpressure of 400 kPa (4 bar) on the system
and its dimension must correspond to the rated boiler output. The safety valve must be located
directly behind the boiler. Any stop valve must not be located between the safety valve and boiler. If
you have any questions, please contact our contractual assembly firm and service organizations.
Installation
Installation can be only carried out by a qualified person. For the correct operation of the thermostatic, two
ways safety vent it is necessary to comply with the conditions for its installation and keep the flow directions
marking on its body. The safety vent is always mounted in the output pipe of boiler or directly on the upper
part of boiler, where the hot water leaves boiler and is transported into heating system. When installing the
A – cold water inlet
B – output to boiler
C – output to drain
D – input from boiler