REFIX DD-8 diaphragm expansion vessel, 8L, 16 bar / 70°, G3/4" threaded connection, green, for DHW, wall-mounted, with non-replaceable membrane, with Rp 3/4" tee 7301905

REFIX DD-8 Diaphragm Expansion Vessel

/br>The REFIX DD-8 diaphragm expansion vessel is an advanced device designed specifically for domestic water installations, pressure boosting systems, and water heating installations. With a nominal capacity of 8 liters and a maximum usable capacity of 5.7 liters, it ensures effective pressure maintenance throughout the entire installation. /br>#### High-quality construction and materials /br>The device is equipped with a non-replaceable bladder membrane made of butyl rubber (IIR), which complies with the strict PN-EN 13831 and DIN 4807 part 5 standards. The membrane meets KTW-C and W270 requirements regarding contact with drinking water, guaranteeing the highest level of hygiene. /br>The vessel body is painted both externally and internally with a KTW-A coating, providing comprehensive corrosion protection. All elements in contact with water are appropriately protected against corrosion. /br>#### Operating parameters and safety /br>The vessel operates at a maximum working pressure of 16 bar and a temperature of up to 70°C. The factory-set pre-charge pressure is 4 bar, which optimizes the operation of the entire installation. The device can operate in temperatures from -10°C to +70°C, making it resistant to various operating conditions. /br>Compliance with the Pressure Equipment Directive 2014/68/EU and possession of the registration number DIN DVGW NW-0411AT2534 confirms the highest standards of safety and manufacturing quality. /br>#### High-Flow system /br>A characteristic feature of this model is the High-Flow flow direction system, which enables efficient water circulation through the vessel. This system is implemented using a special flow element and the included tee with a diameter of Rp 3/4". /br>This design ensures not only the maintenance of appropriate pressure but also water savings during heating - the flow-through vessel allows for more economical use of water resources. /br>#### Application and compatibility /br>The REFIX DD-8 vessel is intended exclusively for installation on cold water pipelines, which is crucial for maintaining the parameters of the membrane and protective coatings. Installation is only possible in a vertical (hanging) position, and the device dimensions are a diameter of 206 mm with a height of 345 mm. /br>The threaded connection with a size of G3/4" allows for easy connection to standard hydraulic installations. The weight of the device is approximately 2.4 kg, which facilitates installation and servicing. /br>#### Standards and quality certificates /br>The product has full technical documentation confirming compliance with the German construction standards DIN EN 13831 regarding pressure vessels and the DIN 4807 part 5 standards specifying inspection requirements. Additionally, it holds a certificate from the National Institute of Hygiene (PZH), confirming its safety for public health. /br>The system can optionally be equipped with Flowjet flow fittings, expanding the basic functionality with additional regulatory and control capabilities.