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Shut-off and check valves
The shut-off valves are equipped with a built-in check valve,
positioned inside the ball.
1. To allow the passage of the fluid
in the two directions, the ball
valves must be opened at 45°,
using a 9 mm fixed wrench.
The check valve is opened by the
ball, see figure (A).
2. In normal system operation, the
ball valves must be completely
open.
Air separator device
The solar circulation units with flow and return connection are
equipped with an air separator device on the flow line. The gases
separated from the thermal carrier medium collect at the top of the
deaerator.
The collected gases must be evacuated from time to time (every
day after commissioning and afterwards, depending on the
quantity of air, once a week or once a month) using the manual air
vent with a suitably sized screwdriver.
To maintain optimal efficiency of
the
solar
thermal
system,
afterwards, it is necessary to
vent the system every six
months by using the deaerator.
A
Balancing valve with flow meter
The circulating units are equipped with a particular balancing valve
with built-in flow meter and indicator with magnetic movement.
By means of this device, the flow rate may be easily regulated at
the desired value in the system, adjusting the ball valve and
reading the value on the graduated scale.
Flow rate adjustment
The flow rate is adjusted by carrying out the following operations:
A. With the aid of the indicator (1),
mark the reference flow rate at
which the valve has to be set.
1
C.Keeping the obturator open, apply a wrench on the control stem
of the valve (4) to adjust the flow rate. It is indicated by a metal
ball (5) that runs inside a transparent guide (6) marked by a
graduated scale in l/min.
4
D.After completing the balancing, release the ring of the flow meter
obturator which, thanks to an internal spring, will automatically go
back into the closed position.
Correction for liquids with different density
The variation in the flow rate reading remains within the range of
accuracy indicated (±10%), for glycol percentages up to 50%.
Complete closing and opening of the valve
The
valve
can
be
completely opened or
closed.
A slot on the obturator
stem
indicates
the
status of the valve.
7
B. Use the ring (2) to open the
obturator that shuts off the
flow of medium in the flow
meter
(3)
under
operating conditions.
3
2
5
6
Completely closed
Completely open
A
B
normal
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