| 摘要 |
A continuous flow rotary valve for multiple bed regenerative fume incinerators which has a cylindrical valve housing with three or more bed ports spaced equally about the middle or central portion of the housing, feed and exit ports at opposite ends of the housing and a purge port spaced from the other ports. The valve also includes a cylindrical valve rotor having feed, exit and purge cavities in free flow fluid communication with the feed, exit and purge ports. The feed and exit cavities have radially outward openings which are circumferentially wider than the circumferential space on the housing between two bed ports. During rotary movement of the valve rotor from one operating position to another, the feed cavity will supply feed gas to two bed ports during a portion of the rotary movement and the exit cavity will receive exit gas from two beds during a different portion of the rotary movement. The flow of feed gas to the incinerator and the flow of cleaned exit gas from the incinerator is uninterrupted during movement of the valve rotor to cycle the beds. The circumferential space on the exterior cylindrical surface of the rotor between the feed cavity opening and the exit cavity opening is greater than the circumferential width of the widest bed port, thus preventing leakage of feed gas to the exit cavity by way of a bed port during rotation of the valve rotor from one operating position to another. Although the valve is particularly useful in 3 bed regenerative fume incinerators, constant flow valves are also shown for 5 and 10 bed incinerators.
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