The four-way valve, or four-way cock, is a fluid control valve whose body has four ports. One commonly used form—the rotary four-way valve—has equally spaced ports around the valve chamber and a plug with two passages that connect pairs of adjacent ports.
The four-way valve, or four-way cock, is a fluid control valve whose body has four ports. One commonly used form—the rotary four-way valve—has equally spaced ports around the valve chamber and a plug with two passages that connect pairs of adjacent ports.
Source: Wikipedia "Four-way valve" · CC BY-SA 4.0
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