vented-double-check-valve
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vented double check valve
Standards
see mechanical backflow prevention device
Source - AS/NZS 3500.0:2003: Plumbing and drainage
HB50
vented double-check valve
HB50
device to prevent backflow caused by backsiphonage or backpressure in a system, which incorporates a ventilation valve and two independently operating force loaded non-return valves, that prevent backpressure when operative
When the upstream non-return valve becomes inoperative, air is admitted automatically to the chamber between the non-return valves.
See also: mechanical backflow prevention device