Safety Relief Valve CALEFFI 1/2" 1.5 bar model 311415

CALEFFI 1/2" 1.5 bar model 311415 is a threaded safety relief valve designed to protect closed heating and hot water systems from overpressure. The valve is factory-set to open at 1.5 bar, discharging excess pressure to prevent damage to boilers, heaters and piping. Its compact 1/2" threaded connection and straightforward mechanical operation make it suitable for conventional residential and light commercial installations where reliable overpressure protection is required.

Advantages

The CALEFFI safety relief valve provides precise pressure relief at the specified setpoint without electronic components, offering mechanical simplicity and long-term reliability. Its 1/2" threaded connection enables easy installation into existing systems and tight spaces. The valve is designed for compatibility with typical hot water and heating circuit materials and temperatures, ensuring stable performance under normal operating conditions.

Suitable for

• Protection of domestic boilers and water heaters
• Hot water circulation and heating loops
• Closed plumbing systems requiring pressure relief
• Replacement of worn or non-compliant safety valves

Key specifications

• Connection size: 1/2" threaded
• Set pressure: 1.5 bar (factory-set)
• Function: mechanical pressure relief for closed systems
• Application: heating systems, hot water circuits and boilers
• Material compatibility: standard plumbing and heating materials

How to use

Install the valve in the system at a recommended location such as the boiler or near the pressure vessel, ensuring the 1/2" threaded connection is properly sealed with suitable tape or sealant for the system media. The outlet should be directed to a safe discharge point or drain in accordance with local regulations. After installation, pressurize the system slowly and check for leaks. The valve remains closed during normal operation and opens automatically when system pressure reaches the 1.5 bar setpoint to discharge excess fluid or steam.

Usage recommendations

Periodically inspect the valve and discharge piping for corrosion, blockage or leakage. Do not repair or modify the valve; replace it if it shows signs of malfunction. Follow local codes and manufacturer guidance when locating the discharge line and when performing maintenance to ensure safe operation of heating and hot water systems.