Safety Relief Valve with Thermal Discharge and Automatic Refill CALEFFI 544400

CALEFFI 544400 is a safety relief valve with thermal discharge and automatic refill designed for hydraulic and heating systems. The device combines pressure relief with a thermal discharge function that evacuates heated fluid when temperature-driven expansion raises system pressure, while an integrated automatic refill mechanism restores system fluid to maintain operational pressure. The valve is intended for use in closed-loop heating circuits, boiler protection and heat-exchanger safety where controlled overpressure relief and topping-up are required.

Advantages

The safety relief valve integrates thermal discharge and automatic refill functions into a single compact unit, reducing installation space and simplifying piping. It provides reliable pressure regulation and controlled evacuation of overheated fluid to protect system components. The automatic refill feature helps maintain stable pressure without manual intervention, reducing downtime and the need for frequent checks. The design supports straightforward maintenance and can be fitted into existing systems with standard connections.

Suitable for

• Closed-loop central heating systems
• Boiler protection against overpressure and thermal expansion
• Heat exchangers and thermal oil systems requiring controlled discharge
• Hydraulic circuits where automatic topping-up is necessary

Key specifications

• Function: Pressure relief with thermal discharge and automatic refill
• Application: Hydraulic and heating systems, closed-loop circuits
• Operation: Automatic pressure relief and automatic replenishment of fluid
• Design: Compact combined valve body for relief and refill functions
• Materials: Corrosion-resistant valve components suitable for heating fluids
• Installation: Inline mounting compatible with standard heating system piping

How to use

Install the valve in the pressure line according to system design, ensuring proper orientation for thermal discharge and refill connections. Set system pressure and verify the relief setpoint in line with the system’s required maximum working pressure. Connect discharge piping to a safe drain point and ensure the refill source is properly connected and vented. After installation, perform a system pressure test and check for correct operation of the relief and refill functions during controlled heating cycles.

Usage recommendations

Use the valve in systems with compatible fluid types and within the manufacturer’s recommended temperature and pressure limits. Periodically inspect discharge and refill connections for leaks and deposits, and perform functional checks during routine maintenance to confirm reliable relief and automatic topping-up.