The ball type paraffin removal unit has low reliability in moving ; while the tooth type unit has the disadvantages of teeth being apt to break and causing damage of tubing inwall 球型清蜡器的主要缺点是运动的可靠性差，一旦钢球丧失锁紧功能，将失去“步进足”的作用；而齿型清蜡器的步进齿易破损及齿尖易刺伤油管内壁。
3.
In the situation that the reflection loss of the duct inwall was not in considering , even condensed the pump beam 100 times , it could realize the output efficiency of more than 70 % , this was that the other coupling way hardly to accomplish 在不考虑内壁反射损耗的情况下,即使将泵浦光束缩束100倍,也能够实现70 %以上的输出效率,这是现有其他耦合方式难以实现的。
4.
The inner lining of such materials as br , nr , cr , fer , rpp , pvd , ptfe and f46 in the valve body of all kinds of cast iron and carbon steel or in the inwall of pipe castings can not only adapt to corrosion medium under different working conditions , but also can replace a great many rare and precious metal , which has , under the normal working conditions of valve , saved a large amount of funds for the users 通过在各类铸铁、碳钢的阀体或管件内壁上进行内衬br / nr / cr / fer / rpp / pvd / ptfe / f46等材料，不但可以适用于不同工况下的腐蚀性介质，而且可以替代许多稀有贵重金属，为用户在保证阀门正常使用的条件下节约大量的资金。
