Safety valve for heating - 1/2 "Fx3/4 "F; Kv 0,540; 4,5bar; KD15 DUCO IVAR.PV KD

Product detailed description

Heating systems in residential and commercial buildings require reliable pressure management to prevent damage from overpressure conditions. This safety valve is commonly installed in closed heating circuits, such as those found in central heating systems, heat pumps, and underfloor heating installations. It ensures that excess pressure is released when system parameters exceed safe limits, protecting components like expansion vessels, pumps, and heat exchangers. The valve is typically mounted on the primary circuit, near the boiler or heat source, where pressure fluctuations are most likely to occur.

Correct sizing and selection of the safety valve are essential to ensure it operates within the system’s design parameters. The valve must be compatible with the system’s maximum operating pressure and temperature range. It should also be sized to handle the expected flow rate during pressure relief events, preventing excessive pressure build-up and ensuring rapid response.

Technical parameters

Material	Brass
Operating temperature	-10 °C
Nominal pressure	PN 16
Code	691520.45
Brand	IVAR

The nominal pressure rating of PN16 indicates that the valve is suitable for systems operating up to 16 bar. The adjustable opening pressure range of 0.5 to 10 bar allows for customisation to match the system’s specific requirements. The operating temperature range from -10°C to +120°C makes it suitable for a wide range of heating applications, including those with seasonal temperature variations. These parameters are critical for ensuring the valve functions correctly under both normal and abnormal operating conditions.

Installation and connection

The valve features 1/2 inch female and 3/4 inch female threaded connections, which must be securely tightened using appropriate tools. Prior to installation, ensure the system is depressurised and the valve is set to the correct opening pressure according to the system’s design specifications. Common installation mistakes include incorrect orientation of the valve, failure to specify the required opening pressure during ordering, and improper sealing of the threaded connections. Always verify the valve’s setting using a calibrated pressure gauge after installation to confirm correct operation.

Compatibility and accessories

This safety valve is compatible with standard heating systems that operate within the specified pressure and temperature ranges. It is typically used in conjunction with expansion vessels, pressure sensors, and control valves. When ordering, the required opening pressure must be specified, as the valve is supplied with a pre-set pressure within the 0.5 to 10 bar range. No additional accessories are included in the standard package.

Technical background for designers

The valve operates on a direct-acting principle, where internal spring force is adjusted to determine the pressure at which the valve opens. The brass construction provides good corrosion resistance and mechanical strength, making it suitable for use in water-based heating systems. The valve integrates into the system by responding to pressure changes and releasing excess media through the discharge port. The service life and efficiency of the valve depend on the quality of the installation, the cleanliness of the system fluid, and the frequency of pressure fluctuations.

Service and operation

Regular inspection of the valve is recommended to ensure it remains free from debris and operates smoothly. Check the opening pressure annually using a calibrated pressure gauge and adjust if necessary. No specific service intervals are provided in the technical data, but any signs of leakage or malfunction should be addressed immediately by a qualified technician.

Frequently asked questions

Can the opening pressure be adjusted after installation?
Yes, the valve can be adjusted to the required opening pressure using a pressure gauge and adjustment tool. However, it is recommended to specify the desired pressure during ordering to ensure correct factory settings.

Is this valve suitable for use in high-temperature systems?
Yes, the valve is rated for operation up to +120°C, making it suitable for most heating applications, including those with elevated temperatures.

Can this valve be used in open heating systems?
No, this valve is designed for closed heating systems only. Open systems require a different type of pressure relief device.

What is the maximum operating pressure of the valve?
The valve has a nominal pressure rating of PN16, meaning it can safely operate in systems up to 16 bar.