Check Valve

A Check Valve is a device that only allows the flow of fluids in one direction. They have two ports, one as an inlet for the media and one as the output for the media. Since they only allow media flow in one direction, they are commonly referred to as ‘one way valves’ or ‘non return valves.’ The main purpose of a check valve is to prevent backflow in the system. Figure 1 shows an example of a check valve.

A Piloted Check Valve needs a pilot pressure to shift the valve from it’s closed position.

They are commonly installed in applications that backflow would cause an issue.