This allows our swing check valve to close completely even when installed in a horizontal pipe run with no flow.
这使得我们的旋启式止回阀无论安装在水平管道还是垂直管道上，都能够实现完全的关闭。
Swing check valves are used to prevent reversal of flow in horizontal or vertical pipe lines.
旋启式止回阀用于防止水平管路或垂直管路的流体倒流。
The pipe racks are moved to and from their stored position by a hydraulic cylinder attached between the mast frame and the lower swing arm.
管架是通过一个装在支架框和下摇动臂之间的液压缸往返于其贮存位置的。
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