Diaphragm expansion vessel REFIX DD-33, 33L, 10 bar / 70°C, threaded connection G3/4", white, for DHW, hanging, with non-replaceable membrane, with tee Rp 3/4". 7380800

Diaphragm expansion tanks – the key to a stable installation

The REFIX DD-33 diaphragm expansion tank is a reliable device that ensures optimal pressure maintenance in domestic water, booster and hot water systems. Its main task is to stabilize the system, protecting it from the effects of pressure fluctuations, changes in water volume due to temperature and water losses. This ensures that the installation operates more efficiently and safely, and its service life is extended.

This diaphragm expansion tank from the DD series, with a capacity of 33 liters and a maximum operating pressure of 10 bar and a temperature of up to 70°C, has been designed to meet the requirements of modern installations. Equipped with a G3/4” threaded connection, it is easy to install and integrate with the existing system. The white housing makes it aesthetically blend into the surroundings. Designed for suspension, which facilitates its placement in limited spaces.

Construction and application

The REFIX DD-33 tank uses a diaphragm membrane that separates water from compressed air. This membrane is non-replaceable, simplifying the operation of the device. The set includes a Rp 3/4” tee, which facilitates connection to the installation. This tank is used both in residential and commercial buildings – wherever pressure stabilization is required.

• Installation protection: Protects the circuit against overload and short circuit — like most circuit breakers in this class.
• Pressure equalization: Maintains constant pressure in the installation, eliminating the risk of damage caused by pressure fluctuations.
• Compensation for volume changes: Eliminates changes in water volume resulting from temperature changes, preventing the formation of vacuum or overpressure.
• Water reserve: Provides a water reserve in case of short-term shortages, e.g. when drawing water from several points simultaneously.
• High quality materials: Made of durable materials ensuring long life and reliable operation.
• Compliance with standards: Meets the requirements of DIN 1988 and has a PZH certificate, which confirms its safety and hygienic use.
• Stainless steel connection: Guarantees high corrosion resistance and ensures hygienic operating conditions in accordance with DIN 1988.
• High-Flow: Provides efficient water flow thanks to the use of a special flow guide.

The REFIX DD-33 tank is an investment in the comfort and safety of your water installation – both for professionals involved in the installation of heating and plumbing systems, and for end users who value stable installation conditions and long-term protection against failures.