... lever safety valve 杠杆安全阀; 杠杆式安全阀 piston valve 活塞阀; 活塞式阀门 overflow valve 溢流阀 ...
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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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