Sealing plug of empty duct

　　1. 膨胀式机械原理，产品具有合理的结构设计，密封性能优越；

　　Inflatable mechanical principle: the product has a reasonable structure design and superior sealing performance.

　　2. 地域适应范围广:产品材料为高密度聚丙烯树脂，耐腐蚀、抗老化，能适应沿海地区、盐碱地区的地质环境；    

　　Extensive range of regional adaptation: the product material is polypropylene resin with high density and it is corrosion-resistant and anti-aging so it can adapt to geological environments in coastal areas and saline and alkaline lands.

　　3. 安装方便，重复使用，降低管道密封成本。

　　Easy to install and it can be used repeatedly so as to reduce the cost of pipeline sealing

　　膨胀式空管密封塞形状像个倒膨胀螺丝，在手柄的旋转下两端收紧，中间的皮圈向外张开，将空管完全密闭。在管道内有水压的情况下皮圈会越压越紧，可以承受15-30kpa的压力。

　　空管密封塞可变径范围在14mm或更大，可以适应多种管道内径，可反复使用。

　　Inflatable sealing plug of empty duct is shaped like an inverse setscrew. When the handle rotates, both ends tighten and the leather collar in the middle stretches outwards to completely close the empty duct. Under the condition that there is water pressure inside the pipeline, the leather collar will become tighter with more pressure and it can withstand 15-30 kpa of pressure. The variable diameter range of sealing plug of empty duct is 14 mm or more so it can adapt to a variety of pipeline inner diameter and can be used repeatedly.