Set point thermostatic regulating unit with distribution kit for primary circuit – 182 series

The temperature regulating unit with the distribution kit for the primary circuit is made to be used in mixed systems: radiant panels and radiators, in combination with distribution manifolds for radiant panels.

The set point regulating unit performs the function of keeping the flow temperature constant, at the set value, for the medium distributed in a low temperature system for floor radiant panels.

In this particular series, the temperature is regulated by a specific hydraulic unit equipped with a thermostatic three-way valve with a built-in sensor.
The function of the kit is to distribute a portion of the medium flowing from the primary boiler circuit to the heating elements.
It is supplied complete with manifolds with built-in shut-off and regulating valves and an adjustable differential by-pass kit for the primary circuit. The latter accessory is essential when there is a primary circuit circulation pump and the radiator circuits are controlled by thermostatic or thermo-electric valves.

Operating principle

The regulator element inside the thermostatic three-way valve consists of a temperature sensor (1) fully immersed in the mixed water outlet chamber. By expanding and contracting, it continuously ensures a correct proportioning of hot water, coming from the boiler, and water returning from the panel
circuit.
The water intake is regulated by a shaped obturator (2) that slides inside a special cylinder placed between the hot water flow (3) and the water returning from the circuit (4).
Even if the thermal load of the secondary circuit or the inlet temperature from the boiler change, the mixing valve automatically adjusts the flow rates until it obtains the set temperature.

Construction details

Regulating unit body
The valve body, containing the temperature regulating device, is made out of a single casting with connections to the primary and secondary circuits. A specific

internal
channel carries the system return medium to the regulating valve, making it possible for the unit to be smaller in size and easy to connect.

Reduced head losses
The three-way mixing valve is equipped with a special obturator that acts on calibrated water orifices. This ensures a high flow rate and a reduced size, while maintaining accurate temperature control.

Non-sticking materials
The materials used for the mixing valve construction eliminate potential sticking due to scale. All functional parts, such as the obturator, valve seats and guides, have been made using a special material with low friction coefficient, which ensures product performance over time.

Low-inertia thermostatic sensor
The temperature-sensitive element, the “engine” of the thermostatic three-way valve, has low thermal inertia; in this way 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.