103 Series Sealed PRV with Gauge

103 Series 1⁄2″ FBSP × 1⁄2″ FBSP 3 Bar Pressure Relief Valve with Gauge
Disclaimer: All images are for illustrative purposes only.

Discharges water off the system at a set pressure in the event of heating system over pressurisation

Reliance Valves 103 Series Sealed Heating System Pressure Relief Valve with gauge is most commonly used as a safety mechanism within sealed heating systems.

The pressure relief valve is set to the correct pressure upon installation. When the pressure rises within the system and the set pressure is reached, the pressure release valve opens and discharges into the atmosphere. This prevents the pressure within the system from reaching dangerous levels that could damage the system and be harmful to anyone in the immediate vicinity.

Features and benefits

  • Diaphragm design gives improved resistance to scaling and extends lifespan
  • Straightforward removal of single-piece cartridge allows access to seat for cleaning or cartridge replacement
  • Set relief pressure range from 2.0 bar - 3.0 bar gives flexibility of system design
  • Available with FSBP or MBSP/FBSP connections for complete installation flexibility
  • Suitable for heating applications only


WRAS approved product
SKUDescriptionModelBSP Inlet Size ″BSP Outlet Size ″Accreditations
PREL103003103 Series 1⁄2″ FBSP × 1⁄2″ FBSP 3 Bar Pressure Relief Valve with GaugeFemale Connections Pre-set at 3 Bar including gauge1⁄21⁄2