A check valve is a device that only allows fluid to flow in one direction. There are two ports on this valve: one for the media inlet and one for media output. A check valve's principal purpose is to prevent backflow in the system. Because they only allow material to flow in one direction, they are commonly referred to as "one-way valves" or "non-return valves." A pressure differential is required for a check valve to function. More pressure is applied to the input side of the valve than to the output side to open it. The valve closes when the pressure on the output side is higher (or when the pressure on the input side is insufficient). The closure mechanism differs depending on the valve type.
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