Mixing valve - three-way, 6/4"; Kv 28; 10 Nm

Product detailed description

Three-way mixing valves are essential components in hydronic heating systems where precise control of mixed water temperatures is required. This model is typically used in residential, commercial and industrial buildings, especially in systems with underfloor heating, radiators or heat emitters that require variable temperature control. The valve allows for the mixing of hot and cold water streams to achieve a desired outlet temperature, ensuring efficient system performance and thermal comfort. It is commonly installed in central heating systems, where it works in conjunction with thermostatic controls and actuators to regulate the flow dynamically based on demand.

The installation involves positioning the valve in a location where it can access both the hot and return circuits, and where it is easily accessible for maintenance. The valve is often integrated into a manifold system or directly into the supply line. It is important to ensure that the system pressure and temperature remain within the valve’s operational limits to avoid premature wear or failure.

Technical parameters

Material	Brass CW617N
Operating temperature	+120 °C
Actuator torque	10 Nm
Nominal pressure	PN 10
Weight	2.842 kg
Code	501564
Brand	IVAR

The nominal flow coefficient of 28 indicates the valve’s capacity to pass a given flow rate at a specific pressure drop. This is critical for proper sizing and system design. The maximum operating temperature of +120°C defines the upper limit for the medium being controlled. The actuator torque requirement of 10 Nm is relevant when selecting a compatible servomotor for automated control. These parameters should be cross-checked with system requirements during the planning phase to ensure correct integration.

Installation and connection

The valve is connected via 6-inch and 4-inch threaded ports, typically using ISO or BSPT threads depending on the regional standard. Prior to installation, ensure the pipeline is clean and free from debris to prevent internal damage. The valve should be mounted in a horizontal position to ensure proper flow dynamics. Verify that the direction of flow matches the arrow marked on the body. Common mistakes include incorrect orientation, which can cause uneven wear or reduced efficiency. Always isolate the system before connecting and perform a leak test after installation.

Compatibility and accessories

This three-way valve is compatible with a range of servomotors and actuators designed for 10 Nm torque. For automated operation, a proportional or modulating actuator must be selected to match the control system. Additional components such as flow meters, pressure gauges and temperature sensors may be required to complete the control loop. Ensure that all accessories are rated for the same operating conditions as the valve.

Technical background for designers

The valve operates by adjusting the position of an internal plug or disc, which controls the mixing ratio between the hot and cold streams. The brass CW617N material offers good corrosion resistance and mechanical strength, making it suitable for long-term use in heating systems. The PN 10 rating means it is designed for low-pressure applications. The efficiency of the valve is influenced by the accuracy of the actuator and the stability of the control signals. To maximise service life, ensure that the system is protected against excessive thermal cycling and that the medium remains within the specified temperature range.

Service and operation

Routine inspection should include checking for signs of leakage, unusual noise or erratic movement during operation. The internal components may require cleaning if the system is exposed to particulate matter. There are no scheduled service intervals specified in the provided data. Any maintenance should be carried out with the system depressurised and isolated. If the valve fails to respond correctly to control inputs, verify the integrity of the electrical connections and the condition of the actuator.

Frequently asked questions

Can this valve be used with a proportional actuator?
Yes, it is suitable for use with a servomotor that provides 10 Nm of torque. Ensure the actuator is compatible with the valve’s control interface.

What is the recommended mounting position?
The valve should be mounted horizontally to ensure even distribution of flow and to prevent mechanical stress on the sealing surfaces.

Is the valve suitable for condensing boiler systems?
It depends on the system design. The valve is rated for up to 120°C, so it can be used in non-condensing systems. Condensing conditions may require additional corrosion protection.

What thread type is used for the 6/4 inch connections?
The valve is supplied with standard threaded connections, typically ISO or BSPT, depending on regional standards. Always confirm the thread type before installation.