A valve for a plumbing system has a housing with an inlet and an outlet and a valve body movable in the housing between a throttle position with a decreased a flow cross section and reduced flow between the inlet and outlet and an open position with a large flow cross section and free flow between the inlet and outlet. Structure in the valve body applies hydraulic pressure from the inlet or outlet to the valve body to shift same into the throttle position when a pressure differential between the inlet and the outlet exceeds a specified value and into the open position in the absence of a pressure differential between the inlet and the outlet.

An inflatable spa is disclosed having improved strength. A water cavity of the inflatable spa may receive massaging air bubbles and/or jetted water.

An aeration nozzle for spraying water infused with air into an above-ground water cavity defined by a wall, comprising a nozzle body having at least a first internal conical portion including an upstream end and a downstream end, the downstream end being smaller than the upstream end, a water way extending through the nozzle body and the first internal conical portion, an air way extending through the nozzle body, the air way intercepting the water way within the nozzle body downstream of the first internal conical portion, and a check valve disposed along the air way that permits air to be pulled through the air way and into the water way by way of a vacuum force caused by water flowing within the water way through the first internal conical portion and prevents water from entering the air way.

An inflatable spa is disclosed having improved strength. A water cavity of the inflatable spa may receive massaging air bubbles and/or jetted water.

An air connection pipeline device of a massage pool may comprise a pipeline. The pipeline may be formed with a first air connection passage and a second air connection passage. The first air connection passage may have a first air inlet and a first air outlet. The first air connection passage may include a check valve located between the first air inlet and the first air outlet. The check valve may be driven to open when the air flow moves from the first air inlet to the first air outlet and close when reversely. The second air connection passage may be provided with a switch valve. The switch valve may comprise a second valve core and a second elastic body. The second valve core may slide between a closed position to close the second air connection passage and an open position to open the second air connection passage. The second elastic body may press against the second valve core. An initial state of the second valve core may be the closed position.

An aeration nozzle for spraying water infused with air into an above-ground water cavity defined by a wall, comprising a nozzle body having at least a first internal conical portion including an upstream end and a downstream end, the downstream end being smaller than the upstream end, a water way extending through the nozzle body and the first internal conical portion, an air way extending through the nozzle body, the air way intercepting the water way within the nozzle body downstream of the first internal conical portion, and a check valve disposed along the air way that permits air to be pulled through the air way and into the water way by way of a vacuum force caused by water flowing within the water way through the first internal conical portion and prevents water from entering the air way.

An air connection pipeline device of a massage pool may comprise a pipeline. The pipeline may be formed with a first air connection passage and a second air connection passage. The first air connection passage may have a first air inlet and a first air outlet. The first air connection passage may include a check valve located between the first air inlet and the first air outlet. The check valve may be driven to open when the air flow moves from the first air inlet to the first air outlet and close when reversely. The second air connection passage may be provided with a switch valve. The switch valve may comprise a second valve core and a second elastic body. The second valve core may slide between a closed position to close the second air connection passage and an open position to open the second air connection passage. The second elastic body may press against the second valve core. An initial state of the second valve core may be the closed position.

An inflatable spa is disclosed having improved strength. A water cavity of the inflatable spa may receive massaging air bubbles and/or jetted water.

An inflatable spa is disclosed having improved strength. A water cavity of the inflatable spa may receive massaging air bubbles and/or jetted water.

A valve for a plumbing system has a housing with an inlet and an outlet and a valve body movable in the housing between a throttle position with a decreased a flow cross section and reduced flow between the inlet and outlet and an open position with a large flow cross section and free flow between the inlet and outlet. Structure in the valve body applies hydraulic pressure from the inlet or outlet to the valve body to shift same into the throttle position when a pressure differential between the inlet and the outlet exceeds a specified value and into the open position in the absence of a pressure differential between the inlet and the outlet.