easy to maintain and operate 易于维护和操作
Requirements: the pressure differential relief valve must operate to maintain the "zone" between the two check valves at least 2 PSI less than the supply pressure.
要求:压差安全阀必须具有将两个止回阀之间的“区域”压力维持在比供应压力低至少2 P SI的功能。
Our model is easy to operate and maintain.
我们的模型易于操作和维护。
The scope of work would require the contractor to operate and maintain the existing enterprise intranet portal and design, install and maintain the future portal.
这项工作的范围将包括:承包商将运行并维护现有的企业内部网入口,并且设计、安装并维护未来的入口。
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