Embodiments of air admittance valve assembly and plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly to allow or stop a flow for use with enclosed environment includes a housing having, an inlet disposed at a first end of the housing fluidly coupled to environment surrounding housing, an outlet disposed at a second end of housing fluidly coupled to enclosed environment, and an interior volume divided into a first zone, a second zone, and a third zone; a first valve having a first valve seat and a first sealing member urged by an existing force between a closed or open position; and a second valve having a second valve seat and a second sealing member urged by an existing force between a closed or open position.

An apparatus to allow or stop an air flow into an enclosed environment or piping system comprises (a) a housing, (b) a first valve seat, (c) a first sealing member, (d) a second valve seat, (e) a second sealing member, (f) at least one locking mechanism configured to limit a movement of the first sealing member and/or the second sealing member; wherein the first sealing member moves away from the first valve seat when the second pressure is greater than the first pressure in a predetermined pressure difference; wherein the second sealing member moves away from the first valve seat when the third pressure is greater than the second pressure in a predetermined pressure difference; wherein the first pressure communicates with a system pressure in the piping system; and wherein the third pressure communicates with an ambient air pressure.

An apparatus to allow or stop an air flow into an enclosed environment or piping system comprises (a) a housing, (b) a first valve seat, (c) a first sealing member, (d) a second valve seat, (e) a second sealing member, (f) at least one locking mechanism configured to limit a movement of the first sealing member and/or the second sealing member; wherein the first sealing member moves away from the first valve seat when the second pressure is greater than the first pressure in a predetermined pressure difference; wherein the second sealing member moves away from the first valve seat when the third pressure is greater than the second pressure in a predetermined pressure difference; wherein the first pressure communicates with a system pressure in the piping system; and wherein the third pressure communicates with an ambient air pressure.

The present invention relates to systems and methods for automated monitoring of air release valve. The automated monitoring of the air release valve generally includes obtaining at least a first reading from a first sensor coupled to the air release valve, transferring the first reading from the first sensor to an IPCT (information processor and cloud transceiver), processing the first reading from the first sensor in the IPCT to create an output defined as an operating condition of the air release valve and communicating the operating condition of the air release valve across a network and to a server when the reading is flagged.

The present invention relates to systems and methods for automated monitoring of air release valve. The automated monitoring of the air release valve generally includes obtaining at least a first reading from a first sensor coupled to the air release valve, transferring the first reading from the first sensor to an IPCT (information processor and cloud transceiver), processing the first reading from the first sensor in the IPCT to create an output defined as an operating condition of the air release valve and communicating the operating condition of the air release valve across a network and to a server when the reading is flagged.

The present invention relates to an air admittance valve (AAV) that operates automatically at low pressures to selectively open and close an air passageway between an inlet and an outlet. The AAV comprises a valve body having a centrally disposed, internal valve chamber in communication with the ambient environment, and having a valve seat. The AAV includes a sealing member having a flexible diaphragm that is fastened to a support ring, the ring defining one or more lugs on an outer periphery thereof. The AAV further includes a cap member within which the sealing member may be disposed, such that the one or more lugs may interact with an interior surface of the cap. The sealing member may selectively seal or unseal from the valve seat in response to pressure differentials between the inlet and the outlet.

The present invention relates to an air admittance valve (AAV) that operates automatically at low pressures to selectively open and close an air passageway between an inlet and an outlet. The AAV comprises a valve body having a centrally disposed, internal valve chamber in communication with the ambient environment, and having a valve seat. The AAV includes a sealing member having a flexible diaphragm that is fastened to a support ring, the ring defining one or more lugs on an outer periphery thereof. The AAV further includes a cap member within which the sealing member may be disposed, such that the one or more lugs may interact with an interior surface of the cap. The sealing member may selectively seal or unseal from the valve seat in response to pressure differentials between the inlet and the outlet.

The present disclosure relates to a method of controlling a ventilatory volume for inhibiting a release of a harmful gas such as an offensive odor or a toxic substance from a closed-type duct. The method of controlling a ventilatory volume is characterized in that (i) the closed-type duct is divided into a single main duct and multiple branch ducts in a planned area and depends on a harmful gas prevention closed-type duct model in which a negative pressure may be formed by a separately provided means for forcedly discharging gas, (ii) in a state in which no forced gas discharge from the closed-type duct is made, the harmful gas is determined as a standard flow velocity by comparing inverse velocity values of natural positive-pressure flow velocities according to a difference in temperature, a difference in concentration, a difference in elevation of the duct, a stack effect, and the like, (iii) the standard flow velocity is assigned in a lump to flow velocities in the single main duct and the multiple branch ducts provided in the closed-type duct, a sum of the flow rate in the main duct and the flow rate in the multiple branch ducts is basically determined as a ventilatory volume by the means for forcedly discharging gas, and particularly, only the flow rates in the branch duct at the junction points are corrected and determined in a lump based on a ratio of a pressure loss in the main duct to a pressure loss in the branch duct. The method of controlling a ventilatory volume may be applied to the closed-type duct having various usages and shapes and may provide a quantitative criterion related to a minimum ventilatory volume required to inhibit a release of a harmful gas, thereby reducing costs, maximizing operational efficiency, and an operational criterion practical to various types of ventilation devices.

The present disclosure relates to a method of controlling a ventilatory volume for inhibiting a release of a harmful gas such as an offensive odor or a toxic substance from a closed-type duct. The method of controlling a ventilatory volume is characterized in that (i) the closed-type duct is divided into a single main duct and multiple branch ducts in a planned area and depends on a harmful gas prevention closed-type duct model in which a negative pressure may be formed by a separately provided means for forcedly discharging gas, (ii) in a state in which no forced gas discharge from the closed-type duct is made, the harmful gas is determined as a standard flow velocity by comparing inverse velocity values of natural positive-pressure flow velocities according to a difference in temperature, a difference in concentration, a difference in elevation of the duct, a stack effect, and the like, (iii) the standard flow velocity is assigned in a lump to flow velocities in the single main duct and the multiple branch ducts provided in the closed-type duct, a sum of the flow rate in the main duct and the flow rate in the multiple branch ducts is basically determined as a ventilatory volume by the means for forcedly discharging gas, and particularly, only the flow rates in the branch duct at the junction points are corrected and determined in a lump based on a ratio of a pressure loss in the main duct to a pressure loss in the branch duct. The method of controlling a ventilatory volume may be applied to the closed-type duct having various usages and shapes and may provide a quantitative criterion related to a minimum ventilatory volume required to inhibit a release of a harmful gas, thereby reducing costs, maximizing operational efficiency, and an operational criterion practical to various types of ventilation devices.

Provided is a blower installed at a manhole opening, with which it is possible to facilitate an entry or an exit of a worker or an import or an export of an article. The present invention provides a ventilation system comprising a frame and a single or a plurality of airflow generation means arranged at the frame, a direction of an airflow is adjusted so that the airflow generated from the airflow generation means flows along with a virtual axis penetrating a virtual surface which the frame is regarded as to periphery, and the airflow flows while swallowing up the surrounding air of the virtual axis, and an air volume more than two times of total fluid volume of the airflow is generated.