Four-way valve in Solidworks 2017

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A four-way valve, also known as a four-way cock, is a fluid control device featuring a body with four equally spaced ports and a plug containing two passages connecting adjacent ones. The plug can be cylindrical, tapered, or even a ball shape. This valve offers two flow positions, along with a central position where all ports are closed. It's commonly used to isolate a sampling cylinder on pressurized water lines without affecting the system's pressure or causing degassing issues (no leaks, no gas loss or air entry, and minimal external contamination). Historically, it was employed in controlling steam flow to the cylinders of early double-acting steam engines.