Valve Disadvantages: Although the improvements to this generation of valves eliminate the more serious problems of damage from abusive closing, they are not totally immune to abuse.
阀门的缺点：尽管对这一代阀门的改进排除了由于粗暴关闭造成的损害问题中比较严重的问题，但它们还不能完全防止机械损伤。
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。
Built-in pressure relief valve to protect the unit against any abuse from strong pressure or strong wind when closing the door.
内置减压阀，避免因外来强压或强风形态下闭门而成造地弹簧保护或漏油。
Built-in pressure relief valve to protect the unit against any abuse from strong pressure or strong wind when closing the door.
内置减压阀，避免因外来强压或强风形态下闭门而成造地弹簧保护或漏油。
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