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2.3
PLUMBING FIXTURE
Pressure water connects to pipes with 3/4" thread. Blue - cold water supply, red – hot water
outlet. For potential disconnection of the tank, utility water inlets and outlets must be
provided with Js 3/4" screw coupling. The safety valve is mounted on the cold water inlet
identified with a blue ring.
Every hot utility water pressure tank shall be equipped with membrane spring loaded
with safety valve. Nominal clearance of safety valves is defined by standard. Safety valve shall
be easily accessible, fitted as close as possible to the tank. The inlet pipes must have
at least the same clearance as the safety valve. Safety valve is placed high enough to secure
dripping water drain by gravity. We recommend mounting the safety valve onto a branch pipe.
Easier exchange without the necessity of draining water from the tank. Safety valves with fixed
pressure settings from the manufacturer are used for the assembly. Starting pressure of a
safety valve must be identical to the maximum allowed tank pressure, and at least 20 % higher
than the maximum pressure in the water main (Table 16). If the water main pressure exceeds
such value, a reduction valve must be added to the system. No closing armature may be
mounted between the tank and the safety valve. During assembly, follow the guide provided
by the safety equipment manufacturer.
It is necessary to check the safety valve each time before putting it into operation. It is checked
by manual moving of the membrane from the seat, turning the make-and-break device button
always in the direction of the arrow. After being turned, the button must click back into a
notch. Proper function of the make-and-break device results in water draining through the
safety valve outlet pipe. In regular operation, such a check needs to be carried out at least
once a month, and after each shutdown of the tank longer than 5 days. Water may be dripping
off the drain pipe of the safety valve; the pipe must be open into the air, pointed down;
environment temperatures must not drop below zero. When draining the tank, use the
recommended drain valve. First of all, close water inlet in the tank.
Find necessary pressure values in the table below – Table 16. For proper safety valve operation, a backflow
valve shall be mounted on the inlet pipes, preventing spontaneous heater draining of the tank and hot water
penetration back into the water main. We recommend that the hot water distribution from the tank was as
short as possible to minimise heat losses. At least one demountable joint must be mounted between the tank
and every supply pipe.
Adequate piping and fittings with sufficiently dimensioned maximum temperature and pressure values must
be used.
The tanks must be provided with a discharge valve mounted on the cold service water inlet to the tank
for potential disassembly or repair.
When assembling the security equipment, follow the standard.
