Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A best-seller which have a declared working

which have a declared working pressure from above 500 mbar up to and including 5 bar

Quantity surveyors and cost management practitioners

the type of port

What is BS EN 13391 - Mechanical tests for post-tensioning systems about

Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A best-seller which have a declared working1 Scope This European Standard specifies the field of application, the dimensional, the physico chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of controllable backflow preventer with reduced pressure zone Family B Type A. This standard covers controllable backflow preventers of Family B Type A, with reduced pressure zones, intended to prevent backflow by backsiphoning or backpressure of water into the potable