3-way mixing valve FERRO K5ZMV33 1 1/4" female thread for heating systems

The FERRO 3-way mixing valve K5ZMV33 with 1 1/4" female thread is designed for integration into heating and hot water circulation systems. It blends two inlet flows into a single outlet to regulate output temperature and manage return flow to heat sources or radiators. The valve body and connections are sized for standard plumbing assemblies and allow connection of thermostatic or motorized actuators for automated control. Intended for installation in boiler circuits, mixing loops and radiator return lines, the unit supports routine temperature control tasks in residential and light commercial heating systems.

Advantages

This mixing valve provides reliable hydraulic mixing of supply and return streams to achieve stable outlet temperatures. Its female 1 1/4" thread enables direct attachment to standard threaded pipes or fittings without additional adaptors in many installations. The design allows fitment of actuators for precise, automated control and is compatible with common heating-system components, simplifying replacement or retrofit. Constructed for continuous operation in circulation systems, it supports improved temperature regulation and reduced thermal shocks to boilers and radiators.

Suitable for

• Mixing and temperature control in boiler and circulation circuits
• Integration with thermostatic or motorized actuators
• Hydronic radiator and underfloor heating return lines
• Retrofit or replacement in domestic and light commercial systems

Key specifications

• Connection type: female thread 1 1/4" (internal)
• Function: 3-way mixing valve for blending two inlets to one outlet
• Application: heating and hot water circulation systems
• Compatibility: suitable for thermostatic or motorized actuator mounting
• Installation location: mixing loops, boiler return lines, radiator circuits

How to use

Install the valve in the circulation circuit according to system design, ensuring the correct orientation of inlets and outlet. Connect the 1 1/4" female thread to matching threaded piping or fittings, using appropriate sealing material and observing recommended torque levels. Fit a compatible thermostatic or motorized actuator if automated temperature regulation is required. Commission the system by gradually introducing fluid, checking for leaks, and adjusting actuator or manual controls to achieve the desired mixed outlet temperature.

Usage recommendations

Ensure compatibility of actuator mounting and control signals before commissioning. Use appropriate pipe-sealing materials on threaded connections and follow local plumbing codes. Periodically inspect joints and actuator coupling for wear or leaks, and perform routine system maintenance to prevent sediment build-up which can affect valve performance.