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A check valve is a type of valve that allows fluid (liquid or gas) to flow in one direction while preventing backflow in the opposite direction. It operates automatically, without the need for manual control or external intervention. Here’s how it works:

Key Components:

1. Valve Body: The outer casing that holds all internal components.
2. Disc or Poppet: The movable part that opens to allow forward flow and closes to prevent backflow.
3. Seat: The surface against which the disc seals to stop reverse flow.
4. Spring (optional): Some designs include a spring to assist in closing the valve when the forward flow stops.

1. Forward Flow (Open Position):
   • When fluid flows in the correct direction, the pressure pushes the disc away from the seat, allowing fluid to pass through the valve.
2. Reverse Flow (Closed Position):
   • If the fluid tries to flow backward, the disc is pushed against the seat by the reverse pressure (or by a spring if present), creating a seal that blocks the flow.