Safety Relief Valve CALEFFI 3/4" 3 bar model 311530 for heating and plumbing systems

Safety Relief Valve CALEFFI 3/4" 3 bar model 311530 is a compact brass safety device designed to protect heating and plumbing systems by releasing excess pressure at a preset value of 3 bar. Intended for use on boilers, expansion vessels and pipework, this valve provides a reliable pressure relief function in domestic and light commercial installations. The 3/4" connection allows straightforward integration into standard system layouts while the brass construction offers corrosion resistance and durability suitable for routine system conditions.

Advantages

The valve opens at the preset pressure of 3 bar to discharge excess fluid and prevent overpressure situations. Its compact brass body and standardized 3/4" connection enable simple installation in tight spaces and compatibility with common pipe fittings. The design minimizes leakage under normal operating pressure and provides dependable operation when system pressure exceeds the setpoint. Constructed for repeated service cycles, the valve contributes to safe operation of heating and plumbing equipment.

Suitable for

• Domestic and residential central heating systems
• Small commercial heating installations
• Boilers and hot water heaters
• Expansion vessels and associated pipework
• Plumbing systems requiring a 3 bar pressure relief device

Key specifications

• Nominal set pressure: 3 bar
• Connection size: 3/4" (female thread)
• Material: brass body
• Function: automatic pressure relief / safety discharge
• Application temperature range: suitable for typical heating and potable hot water temperatures (consult system requirements)
• Installation position: oriented according to piping layout; provides vertical or angled discharge depending on site configuration

How to use

Install the safety relief valve on the designated discharge point of the boiler, expansion vessel or pipework where pressure protection is required. Ensure the 3/4" connection is properly sealed with appropriate thread sealant or tape and tighten to the recommended torque for brass fittings. The valve should remain accessible for inspection and periodic testing. Once installed, the valve operates automatically: if system pressure rises above 3 bar, the valve discharges fluid until pressure returns below the setpoint. After discharge, the valve reseats to restore normal operation.

Usage recommendations

Fit the valve in a visible and accessible location and route the discharge to a safe drain point. Verify compatibility with system fluids and operating temperatures before installation. Periodically inspect for signs of leakage, corrosion or blockage and test according to local standards and manufacturer guidance to ensure reliable operation. Replace the valve if it shows persistent leakage or mechanical wear.