Safety valve for heating - 3/4 "Fx1 "F; Kv 0,580; 3bar; KD20 DUCO IVAR.PV KD

Product detailed description

Heating safety valves are essential components in central heating systems, particularly in residential and commercial buildings where pressure fluctuations can occur due to thermal expansion or system overloads. Installers working on boiler systems, heat pump circuits, or district heating connections often encounter the need for a reliable pressure relief solution. This valve is suitable for systems operating with water or glycol-based media and is commonly used in closed-loop heating systems where pressure build-up must be controlled without manual intervention.

The valve is designed for integration into systems where pressure regulation is critical for safety and system longevity. It is particularly useful in systems with expansion vessels or where thermal expansion is not fully accommodated. The adjustable opening pressure allows for customisation to match the system’s operating parameters, ensuring the valve opens only when necessary to release excess pressure.

Technical parameters

Material	Brass
Operating temperature	-10 °C
Nominal pressure	PN 16
Code	692025.30
Brand	IVAR

The operating temperature range of -10 °C to +120 °C makes this valve suitable for environments with seasonal temperature variations. The PN 16 rating indicates the valve can handle nominal pressures up to 16 bar, which is important for sizing in relation to the system’s maximum operating pressure. The adjustable opening pressure range from 0.5 to 10 bar allows for precise matching to the system’s requirements, ensuring the valve activates at the correct pressure threshold to prevent damage.

Installation and connection

The valve connects via 3/4 in F and 1 in F threads, which are standard for many heating system components. Before installation, ensure the system is depressurised and the valve is oriented correctly with the flow direction indicated on the body. A common mistake is incorrect thread engagement, which can lead to leaks or improper sealing. Always check the thread type (female/male) and apply a suitable sealing compound or PTFE tape to ensure a leak-free connection. The valve should be installed in a location that allows for easy access for inspection and adjustment.

Compatibility and accessories

This valve is compatible with most central heating systems that use standard brass fittings and operate within the specified temperature and pressure ranges. It is often used in conjunction with expansion vessels, pressure gauges, and temperature sensors. When ordering, the required opening pressure must be specified, as it is not pre-set. No additional accessories are included in the delivery, so ensure all necessary fittings and tools are available for installation.

Technical background for designers

The valve operates on a direct-acting principle, where the spring force is adjusted to control the pressure at which the valve opens. The brass body offers good corrosion resistance and mechanical strength, making it suitable for long-term use in heating systems. The Kv value of 0.580 indicates the flow capacity, which is relevant for system hydraulics and ensuring the valve can release sufficient flow to relieve pressure effectively. The valve’s performance is influenced by the quality of the spring and the precision of the adjustment mechanism, both of which are critical for consistent operation over time.

Service and operation

No specific service intervals are provided in the brief. However, regular visual inspections are recommended to check for signs of wear, corrosion, or leakage. The valve should be tested periodically to ensure it opens at the correct pressure. If the system experiences frequent pressure fluctuations, it may indicate a need for re-adjustment or replacement of the valve. Always follow the manufacturer’s guidelines for maintenance and testing procedures.

Frequently asked questions

Can this valve be used in glycol-based heating systems?
Yes, it is suitable for systems operating with water or glycol-based media, provided the temperature and pressure parameters are within the specified range.

Is the opening pressure pre-set or adjustable?
The valve is delivered with an adjustable opening pressure range from 0.5 to 10 bar. The desired pressure must be specified at the time of ordering.

What thread types are available for connection?
The valve features 3/4 in F and 1 in F connections, which are standard for many heating system components.

Can this valve be used in outdoor installations?
It is suitable for use in environments with temperatures down to -10 °C, but it should be installed in a location protected from direct weather exposure to prevent damage.