What are the two common names for the check-valve used in a diaphragm pump?

The two common names for the check valve used in a diaphragm pump are indeed the Joker Valve and Duckbill Valve. The Joker Valve is a type of one-way valve often used in marine applications, particularly in waste discharge systems, to prevent backflow while allowing fluid to pass through in one direction. It features a flexible design that opens under pressure and closes when the pressure is released, effectively preventing siphoning.

The Duckbill Valve is another type of check valve characterized by its rubber or silicone material and duckbill-like shape. It also allows flow in one direction while preventing backflow, making it suitable for various applications, including bilge pumps and wastewater systems. Both of these valves are critical in maintaining efficiency and safety in systems where backflow could lead to contamination or system failure.

Understanding these specific terms is important for anyone involved in marine systems, as they highlight the unique designs that cater to the demands of fluid management in a vessel's infrastructure.