Safety valve for hot water - 1 "Fx5/4 "F; Kv 0,684; 10bar; KB25 DUCO IVAR.PV KB

Product detailed description

This safety valve is commonly installed in closed hot water circuits, such as those found in central heating systems, solar thermal installations and domestic hot water storage tanks. It is suitable for both new and retrofit projects where pressure regulation is critical for system integrity. The valve is designed for use in systems with nominal pressures up to PN16 and temperatures ranging from 0°C to 95°C. Installers typically integrate this valve into systems where thermal expansion or pump overpressure could cause pressure build-up beyond safe limits.

Proper installation requires careful attention to orientation and flow direction to ensure the valve functions correctly under operational conditions. It is often part of a larger safety strategy that includes expansion vessels and pressure-reducing valves. The valve’s adjustable pressure setting allows it to be tailored to the specific requirements of the system, making it a flexible solution for a wide range of applications.

Technical parameters

Material	Brass
Operating temperature	0 °C
Nominal pressure	PN 16
Code	692532.100
Brand	IVAR

The operating temperature range of 0°C to 95°C makes this valve suitable for most hot water systems. The nominal pressure rating of PN16 indicates the maximum pressure the valve can safely handle under normal operating conditions. The adjustable opening pressure range from 6 to 10 bar allows the installer to set the valve to match the system’s pressure limits, ensuring safe operation and preventing damage from overpressure events.

Installation and connection

The valve is equipped with 1 inch female and 5/4 inch female connections, which must be matched to the corresponding pipe fittings during installation. Before fitting, the installer should confirm the correct orientation of the valve, ensuring that the flow direction aligns with the arrow marked on the body. A common mistake is incorrect threading, which can lead to leakage or improper sealing. It is essential to use appropriate sealing materials such as PTFE tape or jointing compound on the threads to prevent leaks. During installation, the system should be depressurised and drained. After fitting the valve, a visual inspection should be carried out to confirm that all connections are secure and free from defects. The selected opening pressure must be specified at the time of ordering, as it cannot be adjusted after installation. This requires careful coordination between the designer and the supplier to ensure the correct setting is included in the order.

Compatibility and accessories

This valve is compatible with standard hot water systems using copper or steel piping. It is often used in conjunction with pressure-reducing valves, expansion vessels and temperature sensors. To ensure optimal performance, the system should include a reliable pressure gauge to monitor the pressure levels regularly. No additional accessories are included with the valve; the opening pressure setting must be specified separately when ordering.

Technical background for designers

The valve operates based on a spring-loaded mechanism that opens when the system pressure exceeds the set threshold. The brass construction provides good corrosion resistance and mechanical strength, making it suitable for long-term use in hot water environments. The adjustable pressure range allows the valve to be fine-tuned to the system’s operational parameters, ensuring that it activates only when necessary to prevent unnecessary discharge of water. The integration of this valve into the system depends on the overall pressure dynamics and thermal expansion characteristics of the installation. Designers should consider the maximum allowable pressure in the system and select the appropriate opening pressure accordingly. The valve’s performance is influenced by the quality of the installation and the condition of the surrounding pipework.

Service and operation

No regular maintenance is required for this valve unless specified by the manufacturer’s technical documentation. However, periodic visual inspections are recommended to check for signs of wear, corrosion or leakage around the connections. If the valve is found to be discharging water without apparent cause, it may indicate an issue with the system pressure or a fault in the valve itself. In such cases, the valve should be isolated and inspected by a qualified technician.

Frequently asked questions

Can the opening pressure be changed after installation?
No, the opening pressure must be specified at the time of ordering and cannot be adjusted once the valve is installed.

What is the maximum operating temperature for this valve?
The valve is rated for operation up to a maximum of 95°C, making it suitable for most hot water systems.

Is this valve suitable for use in solar thermal systems?
Yes, provided the system operates within the specified pressure and temperature limits and the valve is correctly sized for the application.

Can this valve be used in open hot water systems?
No, this valve is designed for use in closed systems where pressure regulation is necessary. Open systems typically do not require such pressure control mechanisms.