Product Overview
Directions of flow and position indicator
Removing the actuator exposes the slot on the top of the control
stem. This engages the actuator pin, permiting the opening/closing of
the valve manually with a screwdriver.
The position of the pin shows the
direction of flow with relation to the position of the ball, which is especially
helpful when testing or checking the system.
The position of the slot for each valve type is illustrated in each
diagram below and shows the direction of flow.
Two-way valve 6442 series
Three-way valve with by-pass 6443.. 3BY code
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.
All directions of flow can be reversed.
ACTUATOR CLOSED POSITION
(black wire powered)
Actuator
· ON/OFF mode
The valves can be used in ON/
OFF mode with a single signal for
opening or closing from a three-
wire thermostat/timer-thermostat
or an ordinary switch.
· Modulating mode
The 644004 actuator can be
controlled by any type of three-
wire floating controller for outdoor
reset on radiant systems, for
example. Not recommended for
two-way valves because ball is not
characterized.
· Drive transmission
The tapered coupling between the stem of the valve (C) and the shaft of
the
gear motor (D) produces a constant
mesh of the two components.
This allows for automatic compensation of the mechanical slack from
shaft wear with force (E) on the stem applied by the pressure of the
medium. Sector gear (F) is extra thick for better motor drive and no
stripped gears.
· Valve actuator coupling
The actuator is easy to install or remove with steel clip
(G), providing
direct coupling with automatic locking
.
· Cam and limit micro-
switches
The cam (A) that works
the limit micro-switches
(B) can move vertically
and is supported by a
tapered spring (C). This
keeps the contact with the
micro-switches constant,
compensating for wear of
the parts over time. This internal switch shuts off the motor at the
end of travel.
· Auxiliary micro-switch
The actuator comes complete with an auxiliary micro-switch that can
be used to stop a pump on closing the valve and vice versa. It turns
on average at 80% valve opening.
Construction details
Valve body
· Union seals
The valves have unions with a flat seat and integral
EPDM O-ring seal. There is no gasket to lose or hold onto during
installation.
· Stem seal (A)
Two EPDM O-rings (A) provide high temperature and oxygen
electrolysis resistance from high boiler feed and open system
applications.
· Full-port ball (B)
Allows for higher flow with little pressure drop and high 150 psi
close-off pressure.
AB
AB
49
63
AB
B
AB
A
FORATURA A “T”
Utilizzo ON/OFF tramite termostato a tre li
o modulante su comando da un regolatore a tre punti
Rotazione di 90
AB
AB
CALEFFI
AB
AB
CALEFFI
AB
CALEFFI
CALEFFI
AB
B
AB
A
FORATURA A “T”
Utilizzo ON/OFF tramite termostato a tre li
o modulante su comando da un regolatore a tre punti
Rotazione di 90
AB
AB
CALEFFI
AB
AB
CALEFFI
AB
CALEFFI
CALEFFI
AB
AB
49
63
B
A B
D
A
AB
AB
49
63
E
G
AB
AB
B
AB
A
AB
AB
AB
AB
13 Cv
12 Cv 2.1 Cv
B
F
C
ON/OFF mode with thermostat (three wires or modulating)
when operated by a three-wire floating
90° Rotation
4.5 Cv
4.5 Cv
ACTUATOR CLOSED POSITION
(black wire powered)
ACTUATOR OPEN POSITION
(brown wire powered)
ACTUATOR OPEN POSITION
(brown wire powered)
ACTUATOR CLOSED POSITION
(black wire powered)
C
ACTUATOR CLOSED POSITION
(black wire powered)