Safety valve for hot water - 3/4 "Fx1 "F; Kv 0,580; 7bar; KB20 DUCO IVAR.PV KB

Product detailed description

Hot water systems in residential and commercial buildings require reliable pressure management to prevent damage from overpressure. This IVAR KB20 DUCO safety valve is commonly used in central heating systems, domestic hot water circuits, and industrial applications where precise pressure control is essential. Installers and system designers must ensure correct sizing and positioning to maintain system integrity and safety.

Proper integration of safety valves is critical in closed-loop systems where thermal expansion can cause pressure spikes. The valve must be installed in a location that allows for easy access during maintenance and inspection. It is typically mounted on the outlet side of water heaters or in the main circulation loop. The brass construction ensures durability and resistance to corrosion, making it suitable for long-term use in a range of environments.

Technical parameters

Material	Brass
Operating temperature	0 °C
Nominal pressure	PN 16
Code	692025.70
Brand	IVAR

The nominal pressure rating of PN 16 indicates the valve is suitable for systems operating up to 16 bar. The adjustable opening pressure range from 6 to 10 bar allows for customisation to match the system's requirements. The operating temperature range of 0°C to 95°C ensures compatibility with both cold and hot water applications. These parameters are essential for correct sizing and system integration.

Installation and connection

The valve features 3/4 inch female to 1 inch female threaded connections, requiring compatible pipe fittings for secure installation. Installers should verify the system pressure and temperature conditions before fitting. The valve must be installed in a vertical orientation with the flow direction indicated on the body. Common installation errors include incorrect orientation, which can affect performance, and failure to specify the desired opening pressure at the time of order. Always confirm the selected pressure setting with the manufacturer's guidelines.

Compatibility and accessories

This safety valve is compatible with standard hot water systems and can be integrated with pressure relief piping and expansion vessels. When ordering, the desired opening pressure must be specified: 6, 7, 8, 9 or 10 bar. No additional accessories are included in the standard package. Ensure that the system includes a means of draining the valve and that all connections are properly sealed to prevent leaks.

Technical background for designers

The valve operates by allowing excess pressure to escape when the set point is exceeded. The brass body provides good thermal conductivity and mechanical strength, while the internal components are designed to withstand repeated pressure cycles. The adjustable spring mechanism allows for precise pressure settings, which must be selected based on the system's maximum allowable pressure. Long-term performance is influenced by the quality of the installation, the stability of the system pressure, and the frequency of maintenance checks.

Service and operation

Regular inspection is recommended to ensure the valve functions correctly. Check for signs of corrosion, leakage, or blockage in the discharge port. The valve should be tested periodically by lifting the test lever to confirm it opens and closes freely. No specific service intervals are provided in the technical data; however, any signs of malfunction should be addressed immediately to prevent system failure.

Frequently asked questions

Can the valve be used in a closed expansion system?
Yes, provided the system pressure does not exceed the valve's maximum operating pressure of 16 bar and the temperature remains within the specified range.

Is the valve suitable for steam applications?
No, the valve is designed for hot water only and is not rated for steam use.

Can the opening pressure be adjusted after installation?
No, the pressure setting must be selected at the time of order and cannot be changed in the field.

What is the maximum allowable temperature for this valve?
The valve is rated for continuous operation up to 95°C.