Outer coolingjacket made of glass borosilicate glass;
外部冷却套管由玻璃硼硅玻璃制成；
2
If an external coolingjacket is used, the requirement on valve material can be further reduced.
如在阀体外加上外冷却夹套，则可进一步降低对阀材料的要求。
3
For dirty water or sanitary sewage applications, clogging of the coolingjacket passages can easily occur due to a build-up of solids, grease, corrosion and other matter.