A vacuum check valve allows air to flow in one direction while preventing backflow in the opposite direction. According to the reference, a vacuum breaker check valve allows for the flow of air in one direction, but closes to prevent flow in the opposite direction. When the system operates at normal pressure, the higher pressure inside the system compared to the outside keeps the valve shut.
Here’s a breakdown of how it works:
-
Normal Pressure: When the pressure inside the system is greater than the external environment's pressure, the valve remains closed, preventing any backflow.
-
One-way Flow: The valve is designed to open and allow air to flow in only one direction.
-
Preventing Backflow: If the pressure outside the system becomes greater than the pressure inside, the valve immediately closes, stopping any backflow.
In essence, the vacuum check valve acts as a one-way door for air, ensuring air flows only in the intended direction and preventing any reversal of flow.
