Diaphragm expansion vessel REFIX DE-33, 33L, 10 bar / 70°C, threaded connection G3/4", blue, for DHW, fire protection, underfloor heating, geothermal, wall-mounted, with non-removable membrane 7303900

Diaphragm expansion vessel – a key to a stable installation

The Refix DE-33 diaphragm expansion vessel with a capacity of 33 liters is a reliable solution for installations that do not have to meet the strict DIN 1988 standards. It is suitable for domestic water systems, fire protection, underfloor heating, geothermal energy and industrial installations. Its construction based on a bag membrane ensures effective maintenance of pressure, equalization of water volume changes and compensation for losses. All this translates into stable and safe system operation.

The Refix DE-33 is characterized by high corrosion resistance thanks to the use of materials protected against the action of water. It is factory-prepared for use with potable water and has PZH approval, which confirms its safety for health. Made in blue, designed for hanging (with mounting brackets) or standing mounting.

Functionality and application in practice

Diaphragm vessels perform three key functions in installations: maintaining constant pressure, equalizing water volume changes caused by temperature, and compensating for water losses. Refix DE-33 copes perfectly with these tasks, providing optimal operating conditions for the entire installation. This protects system components from damage caused by pressure and temperature fluctuations.

• Hot water installations: Protects the domestic hot water installation from the effects of water volume changes during heating and cooling.
• Fire protection installations: Maintains the appropriate pressure in the extinguishing system, ensuring its reliable operation when needed.
• Underfloor heating: Stabilizes the pressure in the heating medium circuit, which translates into even heat distribution.
• Geothermal energy: Compensates for changes in fluid volume in the geothermal system, ensuring its efficient operation.
• Industrial installations: Protects equipment from damage caused by pressure and temperature fluctuations in industrial processes.

Technical characteristics and construction

The Refix DE-33 vessel has been designed with durability and reliability in mind. It is equipped with a G3/4” threaded connection, which facilitates its integration with the existing installation. Its dimensions (height 454 mm, diameter 354 mm) allow for easy installation even in limited spaces. The maximum working pressure is 10 bar, and the maximum medium temperature is 70°C – these parameters guarantee safe and efficient operation of the device under typical operating conditions. The constant bag membrane ensures long-term tightness and minimizes the need for maintenance.