O-rings are essential components in heating and plumbing systems where they ensure leak-free operation of valves and actuators. In residential and commercial buildings, these seals are commonly found in radiators, underfloor heating circuits, and hot water installations. Installers working with IVAR valve systems often need to replace or fit new O-rings during maintenance or when upgrading components. The correct seal guarantees long-term performance and minimises the risk of fluid leakage in both closed and open-loop systems.

In heating systems, the integrity of the seal is critical to maintaining pressure and preventing corrosion. This O-ring is specifically designed for use with 3/4 inch valve bodies and actuators. It is frequently used in systems where manual or thermostatic control is required, such as in radiator valves or circulation control units. The material and dimensions are chosen to match the operational demands of these applications.

Technical parameters

Material	EPDM
Weight	0.1 kg
Code	120032
Brand	IVAR

The EPDM material is selected for its resistance to water and steam, making it suitable for use in wet and hot environments. The 3/4 inch size ensures compatibility with standard pipe and valve connections used in European heating systems. When selecting an O-ring, it is important to confirm the exact type and valve model to ensure proper sealing and mechanical fit.

Installation and connection

During installation, the O-ring should be placed in the groove of the valve or . Ensure the groove is clean and free of debris before inserting the seal. The O-ring should fit snugly without being over-compressed. The connection is typically secured using a nut or that compresses the seal against the mating surface. Common mistakes include using incorrect tools that can damage the or failing to align the components properly before tightening.

Compatibility and accessories

This O-ring is compatible with a range of IVAR valves, including the IVAR.VD, IVAR.VS, IVAR.VCR, IVAR.VCD, and IVAR.VCS models. It also works with the IVAR.DD and IVAR.DS shut-off actuators. When replacing an O-ring, it is important to verify the exact model of the valve or actuator to avoid mismatches. Additional components such as nuts, clamps, or sealing compounds may be required depending on the specific installation.

Technical background for designers

O-rings function by creating a mechanical seal between two mating surfaces. The EPDM compound provides flexibility and resilience, allowing it to maintain a tight seal under varying temperatures and pressures. In heating systems, the O-ring helps prevent water leakage while maintaining system pressure. The longevity of the seal depends on factors such as installation quality, system pressure, and the presence of contaminants in the fluid. Proper design of the sealing groove is essential to prevent extrusion or deformation of the O-ring during operation.

Service and operation

Periodic inspection of the O-ring is recommended to detect signs of wear, cracking, or hardening. If the seal shows any damage, it should be replaced immediately to prevent leaks. During service, the valve or actuator should be disassembled carefully to avoid damaging the surrounding components. No specific service intervals are provided in the manufacturer’s documentation, but routine checks are advised in high-use systems.

Frequently asked questions

Can this O-ring be used with IVAR.VC series valves?
It is not specified whether it is compatible with the IVAR.VC series. Refer to the manufacturer's technical documentation for confirmation.

Is the O-ring suitable for hot water applications?
Yes, the EPDM material is suitable for hot water and steam environments typical in heating systems.

How do I know if the O-ring is correctly seated?
The O-ring should sit evenly in the groove without twisting or overlapping. A visual inspection and light pressure test can confirm correct seating.

Can I use a lubricant during installation?
A small amount of water-based lubricant can help with installation, but avoid oil-based products which may degrade the EPDM material.