其特点具有启闭速度快，具有中心向两边调节流量的优点，使得通径介质始终是从中心向周边均匀调节通过。
Hoist speed and the advantage of flow from center to two sides to make path media uniform regulation through center to around.
其特点具有启闭速度快，具有中心向两边调节流量的优点，使得通径介质始终是从中心向周边均匀调节通过。
Hoist speed and the advantage of flow from center to two sides to make path media uniform regulation through center to around.
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