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double check valve

Standards
a device to prevent backflow caused by backpressure, and which has two independently operating force loaded non-return valves and incorporates specific test points for in-service testing
Source - AS/NZS 3500.0:2003: Plumbing and drainage
Standards
see mechanical backflow prevention device
Source - AS/NZS 3500.0:2003: Plumbing and drainage
HB50
double-check valve
HB50
device to prevent backflow caused by backpressure, and which has two independently operating force loaded non-return valves and incorporates specific test points for in-service testing
See also: backflow prevention device