与孔板流量计相比，具有结构简单，安装、维护方便，测量范围宽等特点。
Comparing with orifice flowmeter, it features simple structure, ease installation and maintenance as well as wide range.
油井抽油泵输入泵衬套内孔尺寸镀铬批量生产中存在着工艺参数准确选择、夹具合理设计、槽液维护和调整等一系列问题。
There are a series of problems in batch production of plating chromium for lining inner bores of input tube in oil well pump such as parameter choice, clamp design, bath care and adjust.
容易靠近和维护，检查孔的门用标准绞链连接在皮带安全罩上。
To allow for easy access and serviceability, the inspection port doors are hinged as a standard on belt guards.
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