The lubricator is just high enough to handle the longest string of tools between the wireline valve and the stuffing box.
防喷管的高度恰好足以在钢丝绳阀与盘根盒之间装卸最长的工具串。
Disc holder removable for replacement of disc without dismantling the valve - no special tools required.
阀瓣支架可拆卸进行阀瓣更换，无需拆卸阀门，不需要特殊工具。
This paper introduces the manufacture of sealing surface (valve body) about great size check valve and analyzes the choices and the decisions about geometrical parameters of tools.
介绍了大口径止回阀阀体密封面的加工方法，分析了刀具几何参数的选择与确定。
Seats and seat discs shall be replaceable in both check valves and the relief valve without the use of special tools.
两个止 回阀和安全阀的阀座和阀座阀瓣应该是可更换的，更换过程不需要特殊工具。
Seats and seat discs shall be replaceable in both check valves and the relief valve without the use of special tools.
两个止 回阀和安全阀的阀座和阀座阀瓣应该是可更换的，更换过程不需要特殊工具。
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