Abstract: A venting device intended for connection to a horizontal sanitary vent pipe, in which vacuum pressure excursions occur providing a need for the introduction of air from the outside of the pipe automatically by way of the device without allowing a reverse flow of the evil air from inside the pipe when pressure within is equalized or risen. The device has three adjacent ends. A first end comprises a cap forming tubular chamber integrally housing therein a suitable valve sealing means substantially covering an air inlet means situated within the chamber. The sealing means is securely closed at equilibrium and against high pressure, whilst automatically opening a vacuum within the pipe to admit air. The first end is adjacent a lower tubular body portion having a second and third end. The second end forms a suitable means for affixing the device to a horizontal vent pipe; whereas the third end terminates to an opening which may normally be closed by way of a removable repeatable access fitting.

Abstract: An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movement within, or as otherwise introduced to system of pipe or duct while further remaining tightly closed at normal atmospheric pressure (equilibrium) and equalizing pressure excursions that are below atmospheric pressure occurring within sanitary drainage pipes or room ventilation ducts by admitting air to said pipe or duct.

Abstract: An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movement within, or as otherwise introduced to system of pipe or duct while further remaining tightly closed at normal atmospheric pressure (equilibrium) and equalizing pressure excursions that are below atmospheric pressure occurring within sanitary drainage pipes or room ventilation ducts by admitting air to said pipe or duct.