Three-way mixing valve Termojet, DN32, kvs-12 male thread

Termojet DN32 three-way rotary mixing valve — fitting for medium and high-capacity heating systems with male thread G 1 1/4". Flow coefficient Kvs 12 m³/h, operating pressure PN 10 bar, temperature range –10…+110°C. The valve is mounted under an actuator and provides smooth proportional control of the supply temperature to the heating or underfloor heating circuit.

Technical Specifications

Operating Principle

Three valve ports: A — hot supply from the boiler, B — return from the circuit, AB — outlet to the heating circuit. When the plug rotates 90° on the actuator command, the ratio of hot and return flows is continuously regulated — the temperature at outlet AB changes from the boiler temperature to the return line temperature. Kvs 12 provides low hydraulic resistance in systems with increased heat carrier flow.

Applications

• Boiler rooms with a capacity of 30–60 kW. DN32, Kvs 12 — standard size for private residential and small commercial boiler rooms with increased heat load.
• Large underfloor heating circuits. Underfloor heating area of 150 m² and more — Kvs 12 provides the required flow without pressure drop.
• Weather-compensated control. With the 411 actuator (0–10V), the valve smoothly reduces supply temperature when the outdoor temperature rises — real fuel or electricity savings.
• Parallel circuits from a single boiler. DN32 at the main mixing unit with further distribution to smaller circuits.
• Commercial facilities. Offices, production premises, warehouses — where a high heat carrier flow at moderate supply temperatures is required.

Advantages of Termojet DN32

• Brass body CW617N — corrosion resistance and service life on par with leading alternatives.
• Kvs 12 — for systems with capacities up to 60 kW: sufficient flow without excessive hydraulic resistance.
• Plug torque less than 3 Nm — compatible with standard 6 Nm actuators with a twofold torque reserve.
• EPDM seals — resistance to glycol heat carriers and temperatures up to 110°C.
• A worthy replacement for imported DN32 mixing valves of equivalent Kvs — standard thread, no system rework required.

Compatible Actuators

For the DN32 Kvs 12 valve, actuators with a smoother travel time are recommended to avoid water hammer in high-flow systems:

• Termojet 405N electric actuator (3-point, 230V) — standard choice for boiler rooms with a 3-position controller.
• Termojet 411 electric actuator (0–10V, 24V) — for weather-compensated control and integration with modern controllers and smart home systems.

Valve and Heat Pump

In systems with a heat pump and large underfloor heating areas or low-temperature radiators, the Termojet DN32 Kvs 12 valve provides the required heat carrier flow at a supply temperature of 35–45°C. Paired with the 411 actuator (0–10V) — smooth proportional control that increases the heat pump COP. More details — on the Termojet heat pumps website.

FAQ

How to choose between DN25 Kvs 6 and DN32 Kvs 12?
If the underfloor heating area is up to 150 m² or the boiler capacity is up to 30 kW — DN25 Kvs 6 is sufficient. Choose DN32 Kvs 12 for capacities of 30–60 kW, large floor areas, or increased heat carrier flow in the circuit.

Is an actuator with a 120 s travel time needed for DN32?
For DN32, an actuator with a travel time from 60 s (405N) is recommended — smoother regulation reduces water hammer in high-flow systems. The 411 actuator (0–10V) provides fully smooth analogue control without sudden steps.