Brochure
Construction details
Seals
The valves are equipped with unions with a flat seat with
EPDM O-Ring seal.
Actuator
· ON/OFF mode
The valves can be used in ON/OFF mode with a single electrical
enabling signal for opening or closing given by a three-wire
thermostat/timer-thermostat or an ordinary switch.
· Modulating mode
The electrical construction features of the actuator allow it to be
combined with any type of three-wire floating controller.
· Drive transmission
Thanks to the tapered coupling
between the stem of the valve
(A) and the shaft of the
gearmotor (B), there is a constant
mesh of the two components.
This permits automatic
compensation of the mechanical
slack thanks to the force (C) on
the stem applied by the pressure
of the medium.
· Valve actuator coupling
By means of a steel clip
(D), the
coupling
between the valve and
actuator is fast and easy
with a
straightforward coupling
operation
with automatic locking.
· Cam and limit microswitches
The cam (A) that works the
limit microswitches (B) can
move vertically and is
supported by a tapered
spring (C). In this way
the contact with the
microswitches is kept
constant compensating for
wear of the parts over
time.
· Auxiliary microswitch
The actuator is equipped with an auxiliary microswitch to be used,
for instance, to stop the pump on closing the valve and vice versa.
It turns on for an average valve opening value of 80%.
Directions of flow and position indicator
Removing the actuator reveals the slot on the top of the control
stem on which acts the pin of the actuator:
- it permits opening/closing the valve manually with a screwdriver.
-
its position shows the direction of flow according to the position of the
ball, which is especially helpful when testing or checking the system.
Here are three diagrams, one for each type of valve; the position
of the slot shows the direction of flow.
Two-way valve 6442 series
Three-way valve with by-pass 6443.. 3BY series
Three-way diverter valve 6443 series
Flow diversion can be modulating with the electrical
characteristics of the three-wire control actuator.
All the valves are supplied with the slot/indicator in the horizontal
position.
CALEFFI
CALEFFI
B A B C
B
A
C
D
➡
➡
AB
B
AB
A
ON/OFF mode with thermostat with three wires or modulating
when operated by a three-wire floating
Rotation of 90ϒ
AB
AB
AB
AB
AB
13 Cv
12 Cv 1.5 Cv
4.5 Cv 4.5 Cv