成人小视频在线-成人小视频在线免费观看-成人性a激情免费视频-成人性毛片-日本一区二区三区不卡在线视频-日本一区二区三区精品国产

Problems to be paid attention to when purchasing pvc pipe production line

Date : 2021-04-15

At present, PVC pipe production lines for building drainage and random co-pe pipe production lines are mainly used in home decoration. Consumers should pay attention to the following points when choosing pvc pipe production line and pe pipe production line for building drainage:

(1) Pay attention to the appearance of the pipe. The pipe should be smooth, flat, free of bubbles, discoloration and other defects, with uniform color, no impurities, and uniform wall thickness.

(2) The pipes should have sufficient rigidity, especially drainage pipes, and they should not be deformed when they are pressed by hand.

(3) Pay attention to the pressure grade of the water supply pipes, and choose the pressure grade that meets the requirements of actual use. Generally speaking, hot water pipes should choose pipes with a pipe series S of less than 2.5, that is, the wall thickness of the pipe with an outer diameter of 20 should be 3.4mm or more, and the wall thickness of the pipe with an outer diameter of 25 should be 4.2mm or more.

(4) First choose products that implement the national standard. When purchasing pipes, consumers should pay attention to whether the pipes are marked to implement the national standard. If the implementation is an enterprise standard, they should pay attention.


Copyright ? Zhejiang Zhongjie Machinery Technology Co., Ltd.

Home

Tel

E-mail

Message

主站蜘蛛池模板: 日本不卡视频免费的 | 午夜影视在线 | 色偷偷亚洲综合网亚洲 | 亚洲不卡视频在线 | 欧美日韩国产一区二区三区不卡 | 五月天伦理| 狠狠色色综合网站 | 四虎国产永久在线精品免费观看 | 亚洲第七页 | 日本免费一区视频 | 成年1314在线观看 | 国产精品资源在线 | 色妞女女女女女bbbb | 亚洲精品久久久久久婷婷 | 激情五月婷婷网 | 在线观看播放视频www | 色人人 | 免费一级欧美在线观看视频片 | 色五丁香| 色天网站| 婷婷草 | 色在线网站免费观看 | www.色噜噜| 222网站高清免费观看 | 国产三片高清在线观看 | 精品日韩一区二区三区 | 国产资源在线播放 | 桃桃酱无缝丝袜在线播放 | 成年人一级片 | 欧美性色综合网 | 91国内在线国内在线播放 | 在线播放免费人成毛片乱码 | 午夜毛片网站 | 四虎884tt紧急大通知 | 精品卡1卡2卡三卡免费视频 | 中文字幕在线一区二区三区 | 黄色在线播放网址 | 欧美精品区 | 色停停 | 欧美日本一区 | 丁香六月啪 |