By using the theoretical study results, the modification of the developed vertical disc brush wheel type seeding apparatus was curried up and the results were proved well.

应用理论研究成果对研制的垂直圆盘刷种轮式排种器的参数进行了改进，收到了较好效果。

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NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.

注意：双阀瓣止回阀能够安装在水平或流向朝上的垂直位置。

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The swing check valve can also be mounted to the vertical position, provided the disc should not reach the valve position.

旋转式止回阀也可以安装在垂直位置，此时阀瓣应该无法达到阀门的位置。

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