Safety valve Afriso 1/2" 2.5 bar model 42385 for heating and plumbing systems

Afriso safety valve 1/2" 2.5 bar model 42385 is a pressure relief device designed for closed heating and plumbing systems. The valve opens at a preset pressure of 2.5 bar to discharge excess fluid and protect boilers, hot-water circuits and pressure vessels from overpressure. Constructed for reliable, repeatable operation, this safety valve is suitable for use where conformity with defined pressure-limiting requirements is needed.

Advantages

The valve provides accurate overpressure protection with a fixed set pressure of 2.5 bar, ensuring consistent activation when the threshold is exceeded. Its 1/2" connection size is compatible with common heating and domestic plumbing fittings, enabling straightforward installation. Designed for repeated actuation, the valve offers stable performance in routine operational conditions without requiring electronic controls or a power supply.

Suitable for

• Domestic and commercial boilers
• Hot-water circuits and heating systems
• Closed pressure vessels and expansion systems
• Hydronic and radiator heating installations

Key specifications

• Connection size: 1/2" (female)
• Set pressure: 2.5 bar (fixed)
• Function: automatic pressure relief for closed systems
• Application temperature: suitable for typical heating system temperatures
• Material: corrosion-resistant components for wet-system use

How to use

Install the safety valve in the designated pressure discharge point of the closed system, typically on the boiler, return line or an expansion vessel connection. Ensure the valve is mounted vertically or as recommended by system documentation, and that outlet discharge is routed to a safe drain or drainage system. Before commissioning, verify correct tightness of the threaded connection and that the system is depressurized during installation. After installation, pressurize the system gradually and check for proper sealing and absence of leaks. Do not tamper with the factory set pressure.

Usage recommendations

For reliable operation, perform routine inspections for signs of corrosion, blockage or leakage and confirm discharge piping remains unobstructed. Replace the valve if it fails to seat properly or shows persistent leakage. Follow local codes and manufacturer guidance when integrating the safety valve into heating and plumbing systems.