The Vaillant 509228 Pressure Relief Valve is a genuine safety component designed to protect your boiler and central heating system from excessive pressure. It automatically releases water when system pressure rises above safe operating limits, preventing stress on internal components, avoiding seal or pipe damage and reducing the risk of system faults or leaks. A functioning pressure relief valve is essential for both safety and long-term reliability in a closed-loop heating system.

This pressure relief valve is compatible with Vaillant boilers and heating systems that specify part number 509228 in their technical documentation. To ensure correct fitment and reliable protection, always verify the part number on your existing valve or consult your boiler’s service information before installation, as valve sizes and pressure ratings vary between models and system configurations.

Supplied ready for direct replacement, the 509228 Pressure Relief Valve connects to the boiler’s designated safety port and integrates with the system’s pipework when installed by a qualified Gas Safe engineer. Choosing this genuine Vaillant component helps maintain correct pressure control, supports safe operation and contributes to dependable heating performance in compatible boilers and systems.