Embodiments of a valve assembly and a method of detecting a leak in the same are provided herein. In some embodiments, a valve assembly for use with an enclosed environment includes a housing having an interior volume; a first valve having a first valve seat and a first sealing member at least partially extending through a first opening in the first valve seat in a closed position; a second valve disposed beneath the first valve and having a second valve seat and a second sealing member at least partially extending through a second opening in the second valve seat in a closed position; and a position sensing device coupled to an inner wall of the housing beneath the first valve and configured to detect a position of the first sealing member.

An apparatus to allow or stop an air or water passage into an enclosed environment comprises a housing, an air supply outlet, an air intake inlet, a ball, a gasket, an inlet air filter, an outlet air filter, wherein the ball is inside the housing and moves freely inside the housing, wherein the ball can reside on the gasket and temporarily forms seal to stop the air or water passage, and wherein the ball can be lifted by a lifting force to detach with the gasket when the lifting force is created by an pressure difference when ambient pressure above the gasket inside the housing is less than ambient pressure in the air intake inlet and when the lifting force is greater than the weight of the ball, wherein the air or water passage will flow through the housing and the air supply outlet when the ball is lifted.

An apparatus to allow or stop an air or water passage into an enclosed environment comprises a housing, an air supply outlet, an air intake inlet, a ball, a gasket, an inlet air filter, an outlet air filter, wherein the ball is inside the housing and moves freely inside the housing, wherein the ball can reside on the gasket and temporarily forms seal to stop the air or water passage, and wherein the ball can be lifted by a lifting force to detach with the gasket when the lifting force is created by an pressure difference when ambient pressure above the gasket inside the housing is less than ambient pressure in the air intake inlet and when the lifting force is greater than the weight of the ball, wherein the air or water passage will flow through the housing and the air supply outlet when the ball is lifted.

An air cleaner may include a filter case configured to introduce, by a suction force of an internal space, ambient air being discharged through a filter provided in the internal space as intake air from which foreign substances are removed; and a built-in valve built in the internal space of the filter case and configured to form an ambient air introduction path for introducing the ambient air and an additional ambient air introduction path separated from the ambient air introduction path and to open the additional ambient air introduction path so that the ambient air flows into through the additional ambient air introduction path when the suction force is increased.

An air cleaner may include a filter case configured to introduce, by a suction force of an internal space, ambient air being discharged through a filter provided in the internal space as intake air from which foreign substances are removed; and a built-in valve built in the internal space of the filter case and configured to form an ambient air introduction path for introducing the ambient air and an additional ambient air introduction path separated from the ambient air introduction path and to open the additional ambient air introduction path so that the ambient air flows into through the additional ambient air introduction path when the suction force is increased.

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.

A fluid dispensing system includes a motor housing and a piston pump assembly connected to the motor housing. A motor is mounted within the motor housing. The piston pump assembly includes a pump housing, a cartridge having a first end that extends into a second end of the pump housing, a piston that extends into a first end of the pump housing and the first end of the cartridge, and a packing stack within the cartridge and adjacent an inner surface of the cartridge and through which the piston extends. The cartridge is configured to be removed from the pump housing, and removal of the cartridge removes the packing stack from within the pump housing while leaving the pump housing connected to the motor housing.

A fluid dispensing system includes a motor housing and a piston pump assembly connected to the motor housing. A motor is mounted within the motor housing. The piston pump assembly includes a pump housing, a cartridge having a first end that extends into a second end of the pump housing, a piston that extends into a first end of the pump housing and the first end of the cartridge, and a packing stack within the cartridge and adjacent an inner surface of the cartridge and through which the piston extends. The cartridge is configured to be removed from the pump housing, and removal of the cartridge removes the packing stack from within the pump housing while leaving the pump housing connected to the motor housing.

An aeration fitting for an aquarium including a hollow outer fitting having an interior channel, a cylindrical back portion, a cylindrical front portion having a threaded outer surface, a tapered cylindrical middle portion, and a frontwardly flared outer lip. A floating ball is disposed within the interior channel of the outer fitting. A hollow inner fitting has an inner channel, a cylindrical posterior portion, a cylindrical anterior portion having a threaded inner surface, a tapered cylindrical central portion, and a frontwardly flared inner lip. A spring is disposed within the inner channel of the inner fitting. Each of the back portion of the outer fitting and the posterior portion of the inner fitting is connectable to an air hose, and the threaded outer surface of the front portion is selectively engageable with the threaded inner surface of the anterior portion within an aperture in a wall of an aquarium.

A cap unit for puncture repair comprises a check valve 6 for preventing a backflow of a puncture repair liquid supplied from a bottle container 2. The check valve 6 is disposed in a first flow path 3 used for taking compressed air from a compressor 8 into a bottle container 2. The check valve is formed by a ball valve 21 disposed in a valve housing zone Y which is located in a vertical passage part 15 of the first flow path 3 and between an upper opening 3U and a valve seat portion 20. The ball valve 21 is formed by a rubber-like elastic body having a specific gravity of 1.1 or more, and a rebound resilience of 15% or less.