down arrow 下行箭头 down direction valve 下行控制阀 down final limit and terminal stopping switch 最低限位及最低楼层停机掣 ..
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Pay attention to the direction of medium in valve body. Add seal cushion between two flanges connection and screw down bolt.
安装时请注意阀体上标注介质流向，两法兰连接时必需加密封垫片，然后均匀锁紧螺栓。
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