Zone valve 230V DN25

Product detailed description

The zone valve 230V DN25 is commonly used in central heating systems to regulate flow in individual zones such as underfloor heating circuits, room-specific heating loops or radiator groups. Installers working in residential, commercial or industrial buildings often integrate these valves into systems with multiple heating sources, such as boilers, heat pumps or solar thermal units. The valve supports both automated and manual control, making it suitable for systems with room thermostats, building management systems or manual overrides. Its FF (female-female) connections allow direct installation between pipe fittings, reducing the need for additional adapters.

This valve is typically found in systems operating with water-based media, including potable water, diluted glycol mixtures and non-corrosive fluids. It can be used in both closed-loop heating systems and open systems such as domestic hot water circuits. The DN25 size is appropriate for medium-flow applications, such as connecting to underfloor heating manifolds or radiator circuits with moderate flow rates. The valve is often selected for its robust design and compatibility with standard heating system components.

Technical parameters

The 12-second actuation time ensures smooth and controlled flow modulation, which is important for maintaining stable temperatures in sensitive environments. The 230V AC power supply is standard for most European electrical systems and allows integration with standard thermostats and controllers. The FF connection simplifies installation by eliminating the need for additional threading or sealing. The operating temperature range of +2°C to +110°C makes it suitable for both low-temperature systems and high-temperature heating circuits, while the ambient temperature limit of +55°C ensures safe operation in typical mechanical rooms or utility areas.

Installation and connection

Installation begins with ensuring the system is depressurised and all electrical connections are disconnected. The valve should be mounted in a position that allows full access for future adjustments or maintenance. The FF (female-female) connection requires standard pipe fittings with matching male threads. A sealing compound or PTFE tape should be applied to the threads to prevent leaks. The valve should be oriented so that the flow direction aligns with the arrow marked on the body. After mounting, the actuator must be connected to the 230V 50Hz power supply via a dedicated circuit, ensuring correct polarity and secure wiring. The system should then be tested for leaks and proper actuation before commissioning.

Common installation mistakes include incorrect orientation of the valve, failure to apply sufficient thread sealant, and improper electrical connections. These can lead to leakage, erratic operation or electrical faults. It is also important to verify that the system pressure does not exceed PN10, as the valve is not rated for higher pressures. For systems with multiple valves, a balancing strategy should be implemented to ensure even distribution of flow across all zones.

Compatibility and accessories

This zone valve is compatible with standard heating system components such as thermostatic valves, circulation pumps and control panels. It works well with underfloor heating manifolds and radiator circuits, particularly in systems where manual override is required. Additional accessories such as mounting brackets, electrical junction boxes and sealing compounds may be needed for a complete installation. While no specific alternative products are listed, similar models with different voltage ratings or connection types may be available for systems with varying requirements.

Technical background for designers

The valve operates using an electric actuator powered by 230V AC. The motor drives a rotating stem that opens or closes the internal gate, allowing or restricting flow through the valve. The body is constructed from durable materials suitable for long-term exposure to water and non-aggressive fluids. The FF connection ensures a secure and leak-free fit when properly sealed. Integration into a system requires careful consideration of the overall flow balance and control strategy, especially in multi-zone systems. The valve’s performance is influenced by factors such as system pressure, media viscosity and ambient conditions. Regular inspection and cleaning of the internal components can help maintain optimal efficiency and extend the service life of the valve.

Service and operation

Periodic inspection is recommended to ensure the valve continues to operate efficiently. This includes checking for signs of wear on the actuator, verifying the integrity of the sealing compound and confirming that the valve opens and closes smoothly. Any irregularities in operation, such as delayed response or uneven flow, should be investigated promptly. The valve does not require scheduled maintenance beyond these checks unless issues arise. If the actuator becomes unresponsive, the power supply and wiring should be inspected for faults. In the event of a leak, the system should be depressurised and the valve re-sealed or replaced if necessary.

Frequently asked questions

Can this valve be used in an underfloor heating manifold?
Yes, it is suitable for use in underfloor heating systems provided the flow rate and pressure match the valve’s specifications. Ensure the system is balanced for even distribution.

Is it compatible with glycol solutions?
Yes, it can be used with glycol mixtures containing less than 50% concentration. Higher concentrations may require a different valve material or coating.

Can it be operated manually during power outages?
Yes, the valve supports manual operation. The actuator can be disengaged and the valve adjusted by hand if the power supply fails.

Does it require a specific control panel?
No specific control panel is required. It can be integrated with standard thermostats or building management systems that support 230V actuation signals.