The purpose of a vacuum breaker is to stop back siphonage. The atmospheric vacuum breakeratmospheric vacuum breakerAn Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water system.https://en.wikipedia.org › wiki › Atmospheric_vacuum_breakerAtmospheric vacuum breaker - Wikipedia consists of a check valve member and an air vent that is normally closed when the device is pressurized. The air vent allows air into the piping system for the purpose of stopping a siphon at the point of use (see Figure A).Jun 10, 2016
How does a vacuum valve work?
A vacuum valve is a device placed in a feed or vent line on a vacuum furnace whose purpose is to isolate the vacuum chamber or direct the flow of gas into the vacuum vessel. These valves can be actuated manually, pneumatically, electropneumatically, electrically or electromagnetically.Nov 12, 2019
Do you need a vacuum breaker?
An external vacuum breaker is required at sillcocks if they don't already have one built in. ... If a sillcock doesn't have the little mushroom cap, an external vacuum breaker is required. At laundry sink faucets, a vacuum breaker is needed if there are threads present that a garden hose could attach to.Jan 17, 2009