CHICAGO — Four-way reversing valves are at the heart of heat pump systems, and are indeed necessary to their function. An American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc.

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Though there are two valves in one body, there are no differences in dimensions between double and single valves, and there is only a slight reduction in flow when compared to a single four-way valve.

Directional-control valves are vital in any pneumatic circuit, directing or blocking airflow to control the speed or sequence of operations. One method of classifying directional-control valves is by ...