Devices to prevent pollution by backflow of potable water. Hose Union anti-vacuum valves. DN 15 to DN 25 inclusive Family H, type B and type D. General technical specification Ingestion-build-84997 BS EN 62258-5 is the

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Devices to prevent pollution by backflow of potable water. Hose Union anti-vacuum valves. DN 15 to DN 25 inclusive Family H, type B and type D. General technical specification Ingestion-build-84997 BS EN 62258-5 is the1 Scope This document specifies: a) the field of application; b) the requirements of hose union anti vacuum valves; c) dimensional and physio chemical properties, and properties of general hydraulic, mechanical and acoustic design of hose union anti vacuum valves of nominal sizes DN 15 up to and including DN 25; d) marking and technical product information. This document specifies the characteristics of hose union anti vacuum valves of nominal size DN