主权项 |
1. A valve comprising:
a housing having an inlet and an outlet port; a ball having a through-passage with matching geometry to the inlet and outlet ports and an axis, the ball mounted within the housing and rotatable to align the through-passage with the inlet and outlet ports; and a variable flow valve comprising two parallel substantially cylindrical rollers, one above the other, engaged to rotate together in opposite direction; each roller having a semi-circular cutout on one side in a direction of the axis of the through-passage, the rollers mounted within the ball with the axes of the rollers at right angles to the axis of the through-passage, such that the rollers in one rotated position completely block the through passage, and in another rotated position provide a fully open circular passage in the direction of the through-passage of the ball. |