1.单向阀.有效流通面积大2.操作简单，滑动灵敏3.连接牙纹可灵活搭配选择 4.开闭时可将开关与执行组件之间的管路内气体排出，方便管路中组件的替换或维修。 1. One-way valve, make effective circulation area large 2. Simple operation, sliding sensitive 3. It can be flexible to choice the thread of the port to connect 4. When opening and closing the gas of the pipe between the switch and implementation components can discharge,so that it will be convenience to replacement of the pipe components or maintenance
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