Dual Plate Check Valve

Dual plate check valve, also known as butterfly check valves, are a specific type of valve in the larger category of non-return or check valves. They play a crucial role in many fluid systems by preventing backflow.

The ‘butterfly’ in the name comes from the design of the valve, which typically consists of two semi-circular plates or ‘discs’. These plates are hinged down the middle and mounted within the pipeline. When fluid flows in the forward direction, it pushes the two semi-circular plates open, allowing the fluid to pass. When the flow stops or attempts to reverse, the pressure drops, causing the two semi-circular plates to swing back together, effectively blocking the pipe and stopping the fluid from flowing backward.

Comparison with Other Types of Non-Return Valves