九九中文字幕国产_在线播放黄色毛片_欧美亚洲国产中文专区在线_日本高清免费一二区视频_aaa级大胆免费人体毛片_国产91口爆吞精_精品毛片无码久久久_亚洲日韩视频在看观看_人妻无码中文字幕2019_国产色吊吊色吊在线视频

Material of main parts:
Body / cover: ductile iron
Stem: 2Cr13
Gland cover: HDPE
Lower protective pipe: PVC or PE
Box / cover: ductile iron

Characteristic:
The direct buried technology does not need to be a gate well, which reduces the amount of installation and the range of embedded depth is adjustable.
It has the advantages of long service life and no internal leakage.
It does not affect the traffic and is safe and reliable. It is connected with the underground part to effectively prevent theft.
The special telescopic structure of the valve stem can effectively prevent the influence of ground subsidence on the valve.