Valve drive device and valve device for controlling fluid flow

The invention provides a valve drive device and a valve device for controlling a fluid flow. The valve drive device has a linear actuator comprising a shaft operatively coupled with an electric motor; a fluid-tight shield housing the shaft and a rotor of the electric motor therein; the control unit is positioned outside the isolation hood; and a housing in which the linear actuator, the shielding can, and the control unit are housed. According to the invention, the housing has a heat shield between the shield and the control unit. The heat shield may have a wall portion molded or mounted on an inner side of the housing, where the wall portion may circumferentially surround a front closed end of the shield. 本发明提供一种用于控制流体流的阀驱动装置和阀装置，所述阀驱动装置具有：包括操作上与电动机耦合的轴的线性执行机构；其中容纳有所述轴和所述电动机的转子的流体密封的隔离罩；位于所述隔离罩外部的控制单元；以及壳体，在其中收纳有所述线性执行机构、所述隔离罩和所述控制单元。根据本发明，所述壳体在所述隔离罩与所述控制单元之间具有隔热屏。所述隔热屏可以具有模制或安装在所述壳体的内侧上的壁部，其中，所述壁部可以沿周向包围所述隔离罩的前端闭合末端。