The invention relates to a knife-shaped gate valve, in particular to a rising stem knife-shaped gate valve.
本发明涉及一种刀型闸阀，尤其涉及一种明杆刀型闸阀。
The gate length and the dimension of the gate head can be controlled in the T-shaped gate processing, and good process controllability and high yield can be achieved.
在该T型栅工艺中栅长和栅帽的尺寸分别进行控制，实现了较好的工艺可控性和较高的工艺成品率。
This article gives a brief description of a special tool for assembling and disassembling of seal rings in the wedge-shaped gate valve for oil (gas) well-head assembly.
本文简要地介绍了装拆采油(气)井口楔形闸密封圈的一种专用工具。
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