Product Overview

HOT WATER

(FROM BOILER)

4 3

SYSTEM SUPPLY

(MIXED OUTLET FLOW)

Operating Principle

The fluid temperature is controlled by a thermostatic three-way mixing

valve regulated by a thermostatic sensor (1) located in the mixed

water outlet chamber (2) of the valve. By expanding and contracting, it

continuously ensures a correct proportioning of hot water coming from

the boiler, and water returning from the secondary circuit. The water

intake is regulated by an internal cartridge, consisting of a piston(5) that

slides inside a cylinder, located between the hot water flow (3) and the

water returning from the circuit (4). Even if the secondary circuit thermal

load or the inlet temperature from the boiler changes, the mixing valve

automatically adjusts the flow rate until it obtains the set system flow

temperature.

Construction details

Low inertia thermostat sensor

The temperature-sensitive element, the “engine” of the thermostatic

three-way valve has low thermal inertia. Therefore, it can quickly react

to changes in the conditions of inlet pressure and temperature,

shortening the valve response time as the thermal load changes.

Temperature adjustment and locking

The control knob is used to adjust temperature in a full turn (360°)

between min. and max. It also has tamper protection for locking the

temperature at the set value.

Temperature adjustment

The temperature is set to the required value by means of the knob with

the graduated scale, on the top of the valve.

Position Min 1 2 3 4 5 6 7 Max

T (°F) 70 80 85 95 105 110 115 125 130

T (°C) 22 25 30 35 40 43 46 50 55

with: T

boiler

= 160°F (70°C)

Adjustment Locking

Turn the knob to the required

number. Unscrew the upper screw

and remove the knob. Place the

knob back on so that the internal

slot mates with the key on the

valve body. Reinstall the upper

screw.