[English] It is used mainly for circulating of slurry upon rinsing of sand, washing of block, removing of block, shell washing and drilling of cement stopper when oil well being overhauled. Under condition of normal work, it needs not to remove pipe-column and big hook to speedily replace sealing packing. It is characterized by high capacity to withstand pressure, safety and reliability etc.
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The system is noted of its simple operation, high detecting precision, working safety and reliability etc.
该系统具有检测精度高、工作安全可靠、操作简便等特点。
So the pendant lamp holder of the utility model has the advantages of few parts, low cost, compact structure, convenient and quick installation, safety and reliability etc.
因此本实用新型的吊灯灯座具有零部件少、成本低、结构紧凑、安装方便快捷、安全可靠等优点。
The system has simple structure and high reliability, and it has broad application prospects in safety monitoring of residential areas, buildings, hospitals and warehouses, etc.
该系统具有结构简单、高可靠性等特点，在小区、大楼、医院、仓库等的安防监控中有广阔的应用前景。
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