目前，法兰连接中大的问题主要是法兰本身不合格和法兰连接不合格。
现在市场上销售的一些法兰存在的质量问题有：
①法兰的钢材不合格，耐压强度较低，PVC管业加盟，在使用若干个月或若干个年后，出现渗水。
②法兰的螺栓孔外缘距法兰的边缘太小，小于5mm，衢州PVC管业，在螺栓紧固时，易使法兰边缘。
At present， the major problems in flange connection are the unqualified flange itself and the flange connection is unqualified.
Some of the quality problems of the flange sold in the market are as follows:
① The flange steel is unqualified and the pressure resistance is low. After several months or years of use， water seepage occurs.
② The outer edge of bolt hole of flange is too small from the flange edge， less than 5mm. When the bolts are tightened，PVC管业厂家， it is easy to make the flange edge.
PPR管和PVC管的区别可以以管径的粗细为依据，但是这种鉴别的要领就必要经历了。首先对管子的环境都要熟习，少要有印象。这样的话时间长了看到管子就知道其规格是多大的了。
The difference between PPR pipe and PVC pipe can be based on the thickness of pipe diameter， but the essentials of this identification must be experienced. First of all， we should be familiar with the environment of the pipe， and have less impression. In this way， after a long time， you can see the size of the pipe.
现在PPR水管的熔焊器制作合格的不多，因为一是缺少部件；二是生产厂家为了节省材料，一些厂家的底座采用很薄的白铁皮，造成上重下轻而不稳。操作时，PVC管业制造，往往需要另一个工人帮助稳住。
At present， there are few qualified welding tools for PPR water piPES because of the lack of parts; Second， in order to save materials， some manufacturers use very thin sheet iron for the base， which makes the top heavy and the bottom light and unstable. When operating， it often needs another worker to help stabilize.
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