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Double Check Valves with DZR brass valve bodies and compression or female BSP connections. Sprung-loaded Cartridges with resilient seats provide positive closure, no water hammer and low opening pressure. Hot-stamped DZR compression nuts with fine thread minimises the torque required to make the joint.
Backflow prevention for fluids in categories 1 – 3 (refer to Scheduled 1 of Water Regulations July 1999) Supply to flats and apartments – refer to Branch Valve Domestic Washbasins, Baths and Showers – refer to ED235 Domestic Clothes and Dishwashing machines (houses only) CWF Primary and Heating circuits (houses only with removable quick fill loop) – see Filling Valve with CA device Hose Union taps (houses only – check valves in taps illegal)
Every Double Check Valve assembly shall have a DZR brass body with compression fittings to BS864-2 – model ED440 – as distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The pressure drop across the assembly at 1.5 m/s pipe velocity shall be less than 0.35 bar. The body and compression connections shall be DZR brass.