Install the safety valve at the highest point of the heat
producer or in the flow pipe close to the heat producer.
Only in this way can it discharge heat by blowing out
hot water and steam.
The safety valve may be installed in any position, but
the upper part of the valve must not face downward.
The flow pipe may be 1 m long maximum and must be
routed in a straight line in the nominal diameter of the
valve inlet.
DANGER!
Safety valve outlet
The safety valve outlet must be directed to the ground
in a pipe so nobody is endangered by hot water or
steam.
The safety valve outlet (vent pipe) must have at
least the same nominal diameter as the valve
outlet, be installed with a consistent gradient and
be routed to a sewage system (e.g. duct). The vent
pipe may contain a maximum of 2 bends and be
2 m long. If a length of more than 2 m is required,
the next size of pipe must be selected. More than
3 bends and 4 m of length are not permitted. The
mouth of the vent pipe must allow easy inspection
and be routed such as to exclude any danger to
persons. If the vent pipe ends above a funnel, its
discharge pipe must have a cross section at least
double that of the valve inlet.
20 (G ¾) 100
25 (G 1) 200
32 (G 1 ¼) 300
40 (G 1 ½) 600
50 (G 2) 900
a. The valve size is determined by the size of the inlet
connection.
Valve size
a
Nominal diameter (DN)
Maximum heating ca-
pacity (kW)
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