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。

youdao

Our model is easy to operate and maintain.

我们的模型易于操作和维护。

youdao

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。

youdao

Certainly, spending cuts are necessary in order to operate and maintain a fiscally responsible government.

FORBES: How Will the Fiscal Cliff Impact Our Innovation Economy?

Companies like ours are able to operate and maintain many public parks using just the user fees that are already paid at the gate, without taxpayer subsidies.

FORBES: Regime Uncertainty and Obamacare

Secondly, if you spend all your money on these camera systems, which are very expensive to operate and maintain and monitor, you have fewer dollars for cops on the beat, for example.

NPR: Public Surveillance: Security vs. Privacy, Part 2