| 摘要 |
A serviceable multiport conversion system for a conventional butterfly valve includes two fittings. A first "T" fitting contains two passageways which join at an internal common bore adjacent a separating wall, the wall defining a secondary seat of the multiport valve. Circumscribing the common bore is an annular flange. A second fitting may be a similar "T" fitting or an "L" fitting. The "L" fitting contains a single passageway which terminates at an internal bore circumscribed by an annular flange. In use, the butterfly valve is removably positioned in sealing engagement between two fittings, with the flanges releasably attached and the inner diameters of the flanges co-extensive with the butterfly valve bore. When a butterfly valve is positioned between an "L" fitting and a "T" fitting and the valve is in its closed position, there is no fluid communication between the passageway of the "L" fitting and the passageways of the "T" fitting. When the valve is in its open position, fluid communication exists between the passageway of the "L" fitting and one of the "T" fitting's passageways. When a butterfly valve is positioned between two "T" fittings and the valve is in a closed position, fluid communication is allowed between passageway pairs of each "T" fitting but not between fittings. When the butterfly valve is in an open position, fluid communication does not exist between passageway pairs of a single fitting, but does exist between one passageway of one fitting and the adjacent passageway of the other fitting. |
