In the following description, we assume that the small (pressure) port is facing up and the other three ports are facing down. With this orientation, you can also see the small solenoid pilot valve with its coil. A standard 4-Way Reversing Valve has only two positions; there are no intermediate positions. In the rst position, the coil of the solenoid pilot valve is not energised. As a result, hot gas under high pressure is fed from the small port’s pilot line (permanent pressure connection) from the right into the slider mechanism’s chamber.

At the same time, the pressure on the left side of the slider chamber is relieved as the gas ows out to the low-pressure side via the connection to the permanent suction port. As a result, the slider moves to the left and opens the main paths from the top to the bottom right and from the lefttothemiddle.Inthesecondposition, hot gas can ow from the top to the left, while suction gas can ow from the right to the middle and down.

This is achieved by energising the coil of the solenoid pilot valve , which causes high-pressure gas to be fed from the left into the slider mechanism’s chamber. This also allows the pressure on the right to be relieved via the middle main port at the bottom, which causes the slider to move to the right.

4-Way Reversing Valve4-Way Reversing Valve used in room air conditioners
In the following description, we assume that the small (pressure) port is facing up and the other three ports are facing down. With this orientation, you can also see the small solenoid pilot valve with its coil. A standard 4-Way Reversing Valve has only two positions; there are no...