To achieve complete cycle of the materials, a user only needs to switch on the valve (4) regularly.

只要定期打开阀门（4）即可实 现物料完全循环。

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And then it puts forward study on the high speed switch valve, using GMM as valve's core, adopting DSP as controller and designing bus communication interface.

在此基础上提出了以超磁致伸缩材料为阀芯，以DSP为控制器，带有总线型接口的高速开关阀的研究课题。

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There is limit block on the valve disc to ensure the open-close position , which is controlled by the stroke switch.

阀门的启闭位置由行程开关控制，且阀板上设有限位挡块以保证阀板的启闭位置。

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