Refix DE 500 Diaphragm Expansion Vessel (10/4 bar)

Refix DE 500 Diaphragm Expansion Vessel (10/4 bar)

The Refix DE 500 diaphragm expansion vessel is a high-capacity pressure control component designed for closed water systems where thermal expansion and pressure fluctuations must be safely managed. In pressurized service water, heating, and technical water installations, changes in temperature or operating conditions cause water volume to expand. If this expansion is not properly absorbed, system pressure can rise rapidly, leading to safety valve discharge, pipe stress, leakage, premature component wear, and reduced overall system reliability. The Refix DE 500 is engineered to prevent these issues by providing controlled volume compensation and pressure stabilization.

• Brand: Refix (Reflex Winkelmann Group)

• Model: DE 500

• Product Type: Diaphragm expansion vessel

• Design: Without through flow

• Color / Finish: Blue, durable epoxy resin coating

• Nominal Volume: 500 liters

• Maximum Useful Volume: 375 liters

• Maximum Working Pressure: 10 bar

• Factory Pre-charge Pressure: 4 bar

• Diaphragm Material: Butyl, replaceable (DIN EN 13831)

• Operating Temperature Range: -10 °C to +70 °C

• Connection Size: G 1 1/4″ (threaded)

• Installation Type: Vertical, floor-mounted

• Diameter: 740 mm

• Height: 1475 mm

• High Water Connection Height: 133 mm

• Tilt Dimension: Approx. 1506 mm

• Weight: 68 kg

• Compliance / Standards: DIN EN 13831, PED 2014/68/EC

• Typical Applications:

  • Service water systems

  • Fire extinguishing systems

  • Underfloor heating systems

  • Heat source and closed-loop water installations