What type of valve used in fuel systems must operate from fully open with a 90-degree rotation?

The valve that is designed to operate from fully open with a 90-degree rotation is the ball valve. This type of valve is known for its quick operation and allows for precise control of fluid flow, opening and closing with a quarter turn due to the spherical disc (the ball) inside it. When the ball is rotated 90 degrees, the bore of the ball aligns with the flow path, allowing fluid to pass through completely, or it can block the flow when turned in the opposite direction.

Ball valves are favored in fuel systems for their reliability, minimal pressure drop, and capability to seal tightly, which is critical in preventing leaks of flammable or hazardous materials. While other valve types, like gate or globe valves, exist for various applications, they either do not provide the same level of quick operation or require more than a 90-degree rotation for complete closure or opening. This makes the ball valve the ideal choice for applications requiring a swift and efficient shutoff.