Diaphragm valves are known as non-return valves and one-way valves. They allow flow in one direction but prevent it in the opposite direction. This undesirable reverse flow is usually called backflow. It can cause contamination, mess or malfunctions. Check valves are powered by flow and the pressure difference that exists between their inlet and outlet ports. 

They provide automatic flow control of liquids and gases using a variety of mechanisms. Small-bore low-pressure systems and vacuum systems make extensive use of diaphragm check valves. They are used to prevent reverse flow and the problems that could result from it. These types of diaphragm check valves are almost always normally open. A self-centering flexible elastomer disc is the working part of this type of diaphragm check valve. The valve body keeps the disc centered over the seating area or sealing surface of the valve.

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