Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A Ingestion-build-64721 provided that the general guidelines

provided that the general guidelines of Annex D concerning allowable workstation differences are followed

Facilities management professionals

A multichannel digital audio tape recorder manufacturer

If a clause or subclause is specifically intended to be applicable to me equipment only

126 (for element contents between 45 % and 90 %)

Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A Ingestion-build-64721 provided that the general guidelines1 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