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Düker - Model 304 and 305 -Underground Hydrant
Underground hydrants 304 and 305 in nominal diameter DN 80 with flange connection are used for drinking and untreated water, up to 16 bar and up to 60 °C. These series have a one-piece body enamelled inside and out, a cast-on and fully enamelled drain opening as well as a factory-fitted EPDM flange gasket with steel core. The three-winged sealing piston is encased in an EPDM elastomer, the solid piston rod is made of stainless steel and the guide piece is made of brass.
The hydrants contain a tried-and-tested stem bearing as well as a stone protector made of EPDM. The bayonet hook with brass ring and the cast iron protective cover are equipped with a stainless steel chain. Self-closing or open covers are also available as options. Both series comply with the requirements and tests of EN 14339 and DVGW (German Association for Gas and Water Applications) test specification W 386 (P). They have been subjected to the DVGW type examination. All materials in contact with drinking water comply with the current status of the UBA (German Federal Environment Agency) assessment principles and guidelines. All elastomers and plastic parts comply with DVGW worksheet W270. 304 and 305 underground hydrants also go beyond standard requirements in numerous areas.