Ball Valve

A ball valve has a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, when is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends and flow is blocked. A ball valve is a ball with a hole allowing liquid flowing through it depending on its position.

Advantages of ball valves include good seal, little or no leaking at all when the valve is fully closed and it will turn regardless of pressure. If the hole through the valve is larger than the pipe inner diameter, the ball valve will offer essentially no pressure drop or restriction when fully opened. Ball valves are often used in high pressure liquid or gas lines, usually six inches or less in diameter, where a complete cut off is important.

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