A diaphragm check valve is not a common valve , but it is a worth consideration. Some of the characteristics which make it a reasonable choice are free unrestricted movement, full closure, fast closure response, and the abilty to handle viscous or abrasive fluids and slurries more reliably than other types of check valves. The small sizes are conical, and larger sizes are typically nozzle type. The design of a diaphragm check valve provides stable operation with pressure variations, pulsing flow, and frequent flow reversals. One of the drawbacks of the diaphragm check valve is that a lot of care is required in the selection of suitably durable materials for the diaphragm.

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