采用薄膜式气缸替代活塞式气缸，排除了活塞环易损漏而导致无法启闭阀门的弊端。
Adopt film cylinder in place of piston cylinder, which remove the abuse that piston ring is easily damaged and lead to not open or close valve.
采用薄膜式气缸替代活塞式气缸，排除了活塞环易损漏而导致无法启闭阀门的弊端。
Adopt film cylinder in place of piston cylinder, which remove the abuse that piston ring is easily damaged and lead to not open or close valve.
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