Radijator Inženjering d.o.o, 36000 Kraljevo, Živojina Lazića - Solunca br.6, Srbija
tel. +381 36 399 140, fax. +381 36 399 150, http://www.radijator.rs
e-mail: [email protected]
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3.2 Safety measures and devices for “PK” series boiler
For safe operation of “PK” series boiler, it is necessary to install following elements and to maintain
them in proper order:
Pressure safety valve, air bleeding valve and pressure gauge;
Flow out valve for thermal safety.
Pressure safety valve (
figure 2
), air bleeding valve (
figure 3
) and pressure gauge (
figure 4
):
Figure 2. Safety valve Figure 3. Air bleeding valve Figure 4. Pressure gauge
Pressure safety valve must have a nominal diameter of 1/2 inch and calibrated on maximum 3
bar.
This safety element which is in the group of pressure limiting instruments must be made in such
way to withstand for short time higher temperatures and overpressure as well as certain content
of glycol in the heating fluid.
Usually at the same place the air bleeding valve (
figure 3
) and pressure gauge (
figure 4
) are
connected in such a way that these three elements together form the safety group and are
mounted using “T” connections.
This safety element must be recalibrated from time to time, which should be shown in valid
documents in possession of the investor i.e. the user of the boiler.
The safety valve must be installed at the highest point on the boiler and directly on the boiler,
without any piping or any other elements in between. Special connection is provided for this
purpose (
see figure 5
). Any reduction of the diameter of this connection is strictly forbidden.
Exhaust part of the safety valve must be made of the pipe with diameter at least the same as the
nominal diameter of the exhaust part of the valve. During the installation, it is also permitted to
use not more than one arch with the radius r > 3d.
