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GAS FLOW
3
Q [m
/h, d=0,6]
8
Low Power
Low Power
Classe B
Class A
Classe B
Classe A
7
6
5
4
3
2
1
0 1 2 3 4 5 6 7 8 9 10 11 12
Pu [mbar]
∆ P[mbar]
Q=[m 3 /h d=0,6 Class B]
3
Q = [m
/h d=0,6 Classe B]
9
8
7
6
2
5
4
3
1
2
1
0
6 7 8 9 10 11 12 13 14 15 16 17 18
Pu [mbar]
INSTALLATION
The SIT 836 TANDEM control valve complies with current safety standards.
Nevertheless, its installation on appliances must be verified in accordance with the specific standards for each
installation. In particular, it is necessary to ensure that requirements relating to the number and class of the automatic
shut-off valves and to the class of the pressure regulator are met. All the installation, setting and adjustment
operations must be carried out exclusively by qualified personnel on the basis of the specific characteristics of the
appliance. The valve is not designed for outdoor use.
MECHANICAL CONNECTIONS (fig. 1)
General recommendations
Do not tamper with sealed parts. Do not slacken assembly screws. Do not remove labels. Avoid blows (knocks, falls
etc.). Only remove dust caps when installing. Do not exceed recommended torques. Ensure that the gas flows in the
direction shown by the arrow on the valve body. Prevent foreign matter from getting into the valve during installation.
In particular, check the cleanliness of the inlet and outlet pipes.
Do not subject the valve to bending in excess of 35 Nm and to torque in excess of 25 Nm.
Use only the specified spanner grips when making the connections.
Main gas connection
The connection must be made using gas pipes with Rp 1/2 ISO 7 thread. Torque: 25 Nm.
If, alternatively, flanges (available on request) are used, first screw the pipes onto the flanges and then the flanges
to the valve.
Recommended torque for flange retaining screws: 3 Nm.
Connection to the pilot burner (versions with pilot burner outlet):
Ø4 mm, Ø 6 mm or Ø 1/4" pipes can be used. Use appropriately sized nut and olive. Tighten to 7 Nm torque.
WARNING: if the pilot outlet is not used it must be sealed using optional plug code no. 0.972.041. Torque: 7 Nm.
Connection to the combustion chamber (fig. 2)
If the valve feeds a pressurized combustion chamber, it should be connected to the pressure regulator (threaded
outlet [A] for Ø 4 mm pipe).
In this case, the use of nut 0.958.008 and olive 0.957.006 is recommended (torque 5 Nm).
I Family (d=0.45)
Q =
II Family (d=0.6)
Q =
III Family (d=1.7)
Q =
Q=[m 3 / h d=0,6 Low Power - Class A]
3
Q = [m
/h d=0,6 Low Power - Classe A]
9
8
7
6
5
2
4
3
2
1
1
0
6 7 8 9 10 11 12 13 14 15 16 17 18
Pu[mbar]
as a function of the pressure drop ∆p
Low Power
Class B
Class A
3
3
4,8 m
/h
4,0 m
/h
3
3
4,2 m
/h
3,6 m
/h
5,3 kg/h
4,6 kg/h
in a function to outlet pressure Pu,
according to EN 88
Inlet pressure range
Curve
Gas type
Nominal
1
2H
18
2
2L
25
Flow Q
∆p = 5 mbar
∆p = 5 mbar
∆p = 5 mbar
Regulated flow Q
Max
Min.
23
15
30
20
5
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