An air pump check valve allows air to flow in only one direction, typically from the air pump to the aquarium, preventing backflow.
Here's a breakdown of how it works:
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One-Way Flow: The check valve is designed to allow air to pass through it in a single direction. This direction is usually marked on the valve with an arrow.
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Mechanism: Inside the check valve, there's a small mechanism, often a spring-loaded poppet or a flexible diaphragm, that opens when air pressure from the air pump is applied. This allows the air to flow through to the aquarium.
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Preventing Backflow: When the air pump is turned off or if there is a pressure drop in the airline, the pressure from the aquarium side pushes the poppet or diaphragm closed, sealing the valve and preventing water from siphoning back into the air pump.
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Installation: The check valve needs to be installed correctly with the arrow pointing towards the aquarium. If installed backward, it will block the airflow completely.
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Example: Imagine blowing into one end of the check valve. If it's correctly oriented, air will pass through. If you try to suck air back through the same end, the valve will seal, preventing any backflow. This replicates the air pump pressure and the prevention of water siphoning.
In essence, the check valve is a simple but crucial component that safeguards the air pump from water damage by ensuring air flows only from the pump to the aquarium.
