Mixing valve - four-way, 3/4"; Kv 8; 5 Nm

Product detailed description

Four-way mixing valves are commonly used in central heating systems to regulate and blend hot and cold media flows. They are essential components in radiant floor heating, underfloor heating, and other systems where precise temperature control is required. This model is suitable for installations involving radiators, fan coils, and heat emitters, particularly in residential and commercial buildings. The valve ensures stable and accurate mixing ratios, which is critical for maintaining system efficiency and occupant comfort.

Installers and system designers often work with these valves in conjunction with electric actuators, thermostats, and control systems. The compact design and robust construction make it ideal for tight spaces and high-demand environments. The valve is typically mounted in the hydraulic circuit between the heat source and the distribution manifold or directly on the heat emitter.

Technical parameters

Material	Brass CW617N
Operating temperature	+120 °C
Actuator torque	5 Nm
Nominal pressure	PN 10
Weight	0.946 kg
Code	501556
Brand	IVAR

The nominal flow coefficient (Kv 8) indicates the valve’s capacity to pass a given volume of fluid under specific conditions. This value is crucial for sizing the valve correctly to match the required flow rate in the system. The operating temperature limit of +120°C defines the maximum allowable temperature of the media passing through the valve, ensuring safe and reliable operation under normal working conditions. The torque rating of 5 Nm specifies the maximum rotational force that the actuator can exert without risking damage to the valve mechanism.

Installation and connection

Installation begins with verifying the correct orientation of the valve body and ensuring that the inlet and outlet ports are aligned with the system piping. The valve features 3/4 inch threaded connections compatible with standard pipe fittings and unions. Installers should ensure that the pipe threads are clean and free from debris before tightening the connections. A torque wrench may be used to apply the recommended tightening force and prevent over-tightening, which could damage the sealing surfaces.

Common installation mistakes include incorrect port alignment, failure to check the thread type, and using incompatible sealing materials. To avoid leaks and ensure long-term performance, the valve should be installed in a stable position and secured against vibration. After installation, a visual inspection of the connections and a pressure test should be performed to confirm system integrity.

Compatibility and accessories

This four-way mixing valve is compatible with electric actuators rated for up to 5 Nm of torque. When integrating into a control system, the actuator must be configured to match the valve’s stroke and response characteristics. Additional components such as mounting brackets, sealing rings, and control wiring may be required depending on the system setup. The valve is not compatible with systems exceeding the specified temperature or pressure limits.

Technical background for designers

The operating principle of this four-way mixing valve involves directing and blending two incoming streams of media—typically hot and cold—to produce a desired output temperature. The valve uses a rotating disc or spool mechanism to regulate the flow paths and maintain the correct mixing ratio.

Proper integration into the system requires careful consideration of the hydraulic balance and control logic. The valve’s performance is influenced by factors such as media viscosity, flow velocity, and the presence of suspended particles. To maximise service life and efficiency, the valve should be installed in a location free from excessive vibration and thermal stress.

Service and operation

Regular inspection of the valve is recommended to ensure continued performance. Key checkpoints include checking for signs of leakage around the connections, verifying the smooth operation of the valve stem, and inspecting the sealing surfaces for wear or damage. No scheduled service intervals are specified in the technical documentation. In the event of reduced performance or abnormal operation, the valve should be isolated from the system and inspected for internal blockages or mechanical issues.

Frequently asked questions

Can this valve be used with media other than water?
It is designed specifically for use with water-based media. Using other fluids may affect performance and could void the warranty.

Is this valve suitable for use with actuators higher than 5 Nm?
Actuators with higher torque may exceed the valve’s mechanical limits and cause damage. Only actuators rated up to 5 Nm are recommended.

How does the valve handle temperature fluctuations during operation?
The valve is designed to operate reliably at a maximum temperature of 120°C. Sudden temperature changes should not affect its structural integrity or sealing performance.

What is the significance of the Kv value for system design?
The Kv value of 8 indicates the valve’s ability to pass a given flow rate under standard pressure conditions. It is essential for calculating the correct size and ensuring proper system balance.