Two-way thermal release valve CALEFFI with a 1.3 m capillary

Function
The dual effect temperature safety discharge valve is used to ensure safety in heating systems that use a fireboxes or stoves as a heat generator. The device integrates in a single block a heat discharge valve and a filling valve that operate simultaneously controlled by a positive safety type remote sensor. The refilling, in case of valve intervention, ensures water circulation in the phase of fuel running out, thus protecting the integrity of the generator.

Operating principle
When the setting temperature is reached, the cold water inlet aperture is opened (passage from 4 to 3) and, simultaneously, the drain aperture is opened (passage from 1 to 2), until the temperature drops to below the trigger value and the inlet and drain close simultaneously. In the event of a malfunction in the sensitive element (5) (6), the valve will perform the same functions described above in a continuous manner.
arrow indicating the point of arrival of the generator pipes on the flow pipe (1) and connection to the safety drain marked with a letter “S” (2).
arrow indicating delivery to the generator (3) and the mains water system inlet, marked with a letter “C” (4).

WICHTIG:
Die Durchflussrichtung ist nicht umkehrbar, die auf dem Ventil markierten Angaben zum Zu- und Ablauf müssen eingehalten werden.

Designation of inputs and outputs Caleffi valve

Installation
The valve can be fitted in any position, vertical, horizontal or upside down. The temperature probe pocket (6), supplied together with the valve, must be fitted on the flow pipe at a distance lower than 0,5 m from the generator or at the highest point of the water heater and anyhow before the drain pipe. The pocket provided with the valve must be used.
In order to be able to control the inlet pressure better, it is advisable to have a charging unit (normally open) on the valve filler pipe, set at the system operating pressure. In the case of operation with an open vessel system, the entire system is charged directly through the pipe connected to the vessel.
In order to avoid any type of malfunction due to the presence of debris, it is advisable to install an inspectable Y strainer on the filling inlet. It is necessary to check periodically that the strainer is not dirty or blocked. The installation of a low head loss strainer, fitted with devices to check the state of cleanliness, is recommended to enable functional testing during the work phase (e.g., pressure gauges upstream and downstream of the filtering element).

Installation of the valve in the installation

Technical specifications

Materials:

Body: brass EN 12165 CW617N, chrome plated
Pocket: brass EN 12164 CW614N
Spring: steel UNI 3823
Hydraulic seals: EPDM

Performance:

Medium: water, glycol solutions
Max. percentage of glycol: 30%
Max. working pressure: 6 bar
Set temperature: 100°C (+0°C/-5°C)
Temperature range: 5–110°C
Discharge flow rate at 1 bar Δp: 1600 l/h
Connections: 1/2” F
Probe connection: 1/2” M
Length of capillary: 1300 mm

Dimensions

Code	A	B	C	D	E	F	G	Weight (kg)
544400	1/2"	60	77	50	162	1/2"	43	1,32

Data sheet

Weight [ kg ]	1.32
Height [ mm ]	162
Width [ mm ]	60
Outlet and inlet supply size [ inch ]	¹⁄₂''
Installation	Horizantal, Vertical, Oblique, Internal
Max. working temperature [ °C ]	110
Min. working temperature [ °C ]	5
Max. operating pressure [ bar ]	6
Opening temperature [ °C ]	100
Flow Rate [ l/h ]	1600