| 摘要 |
A hybrid butterfly valve has a stationary seat and a valve closure disk which may rotate together with an actuating shaft from the fully open position to a position wherein the disk is aligned with the seat, and thereafter may be moved linearly into sealing relationship with the seat. The disk is supported by brackets having an elongated slot through which the shaft extends, the brackets being adapted to move linearly relative to the shaft. Cams fastened to the shaft initiate a 90 DEG rotation of the disk from the fully open position to the position where the valve disk is aligned with the seat, and the cams act thereafter in conjunction with followers carried by the disk to move the disk and the brackets linearly. The disk carries guide members which are positioned in a guide slot, the guide slot having an arcuate portion and a linear portion, and the disk is guided by the guide members guided in the arcuate portion when the disk is fully opened to and until the disk is aligned with the seat, and thereafter the guide members are guided by the linear portion of the slot. A portion of each cam is spring biased so that the cams tightly engage follower rollers carried by the brackets during the rotational portion of the movement of the disk.
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