RMC’s High Pressure Expansion Non-Return (HPNR) Valves are a combination non-return and pressure relief device and are suitable for coil type heat exchange water heaters. The non-return prevents the backflow of hot water into the mains supply. The relief valve prevents an over-pressure condition within the coil.

• Economical one-piece construction
• One valve meets the requirements of expansion and non-return valve for heat exchange heaters
• Increased heating efficiency
• Expanded water is directed to the storage tank rather than dumped to waste
• Sealed spring cavity prevents spring from seizing in the event of calcification
• Dezincification resistant
• Meets Australian Standard for potable water supply
• Suitable for horizontal or vertical installation
• Individually tested and calibrated