Product Overview

CALEFFI
Manual
Thermostatic
Isolation &
Balancing
3
· ···· ·
Valve closed
Pipe from oor
Manual
Pipe from wall
Pipe from wall
CALEFFI
Thermostatic
Isolation &
Balancing
3
· ···· ·
Valve open
Manual
Pipe from oor
Manual
Pipe from wall
Pipe from wall
2
3
4
1
5
Principle of Operation
The thermostatic control head is a proportional temperature controller,
containing a liquid-filled bellows thermostatic sensor.
The valve plug is normally in the spring-to-open (normally open)
position (1) without the control head, or when the control head is in
the maximum open position (setting 5). Under operation the ambient
room temperature of air passing around the sensor rises causing the
liquid in the bellows to expand, pushing the valve control stem down
against the return spring. This closes the valve, reducing fluid flow to
the radiator to cool the room, in proportion to the deviation from the
desired temperature setting. When the room temperature decreases,
the reverse occurs; the bellows contracts, which in turn allows the valve
spring to open the valve, increasing the fluid flow to the radiator to warm
the room.
NOTE: The valve must be installed with the valve plug closing against
incoming flow.
The valve control stem (2) is stainless steel with an EPDM o-ring double
seal. This allows for replacement of the control head (3) even with the
system operating. The valve plug (4) is shaped to provide an optimal
flow characteristic throughout the opening and closing stroke under
proportional thermostatic operation. The wide passageway between
the seat and the valve plug causes reduced head losses in manual
operation.
Tamper-proof cap
The thermostatic control head can be
protected against tampering and theft
by mounting the tamper-proof cap, code
209000, on the knob asshown.
The cover is fastened with two screws
with special heads that can only be
tightened or loosened with the special
hex key, code 209001.
Convertible valve with
manual control
(339452 pictured)
Convertible valve with
thermostatic control head
(339452 with 200000 pictured)
Tailpiece with rubber seal
The radiator connection thread coupling union
is equipped with a special shaped rubber ring
(5). This system ensures a hydraulic seal
without using additional sealing materials
such as hemp or PTFE tape.
6
Isolation and balancing valve
The isolation and balancing valve,
without spring-return action, is
adjusted to either shutoff flow
(isolation) or modulate flow rate
(balancing) with a 5 mm (3/16")
allen head wrench (6). The valve
must be installed with the plug
closing against incoming flow,
as shown.
(343452 pictured)