Automatic hygroscopic vent valve - 1/4" IVAR.HYGRO

Product detailed description

Hygroscopic air vent valves are essential components in closed-loop hydronic systems such as central heating, underfloor heating, and domestic hot water circuits. These valves ensure continuous air removal without manual intervention, maintaining system efficiency and preventing air lock. Installers working on residential, commercial, and industrial buildings commonly use these valves in radiators, heat exchangers, and circulation loops. The IVAR model 508021 is suited for systems where automatic air venting is required and where the operating temperature does not exceed 100°C.

Proper installation of the valve ensures long-term performance and system integrity. The valve is typically mounted at the highest point of the component or pipe section it serves. It is important to ensure the valve is installed in the correct orientation and that the system is free of debris before commissioning. The hygroscopic mechanism reacts to the presence of air, opening the valve automatically and closing it when the system is fully filled with water.

Technical parameters

Installation and connection

The IVAR 508021 is designed for 1/4 inch connections, typically with a male or female thread depending on the fitting. Installers should ensure the connection is clean and free of burrs before tightening. A wrench or spanner may be used to secure the valve, but over-tightening should be avoided to prevent thread damage. The valve should be installed in a vertical position with the arrow on the body pointing in the direction of flow. Common installation errors include incorrect orientation, which can prevent the valve from operating correctly, and installation in areas with high vibration, which may lead to premature wear.

Compatibility and accessories

This valve is compatible with standard copper, steel, and plastic piping systems. It is commonly used in conjunction with thermostatic valves, circulator pumps, and expansion vessels. For systems requiring additional air management, a combination with a manual air vent or a vacuum breaker may be necessary. No additional accessories are required for standard installation, but a sealing ring may be used to ensure a leak-free connection.

Technical background for designers

The hygroscopic mechanism inside the valve uses a material that expands in the presence of air, opening the valve to release it. When the system is fully filled with water, the material contracts, sealing the valve. The nickel-plated brass CW617N body provides resistance to corrosion and mechanical stress. The valve integrates into the system without requiring electrical power or external controls. The service life and efficiency of the valve depend on the quality of the installation, the cleanliness of the system, and the absence of aggressive media such as chemical additives or high mineral content in the water.

Service and operation

Regular visual inspections are recommended to ensure the valve is functioning correctly. The presence of water dripping from the valve indicates normal operation. If air is trapped in the system and the valve is not releasing it, the valve may be clogged or damaged. No scheduled maintenance is required for this model unless specified in the system’s technical documentation. If the valve is suspected of malfunctioning, it should be removed and inspected for blockage or wear.

Frequently asked questions

Can the IVAR 508021 be used in a domestic hot water system?
Yes, the valve is suitable for domestic hot water systems provided the operating temperature does not exceed +100°C and the pressure remains within the PN 10 rating.

Is the valve suitable for use with glycol-based antifreeze solutions?
Not specified in the technical data. Compatibility with glycol-based media should be verified with the manufacturer’s technical documentation.

Can the valve be installed horizontally?
No, the valve must be installed vertically with the arrow on the body pointing in the direction of flow to ensure proper operation of the hygroscopic mechanism.

What is the maximum allowable pressure for this valve?
The valve is rated for a nominal pressure of PN 10, meaning it is suitable for systems operating at up to 10 bar.