This paper introduced that the structure, testing principle and boundary design of the system software for test system of the performance core of security valve.

介绍了安全阀铁心磁性能测试系统的结构、测量原理。系统软件界面设计。

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The structure, testing principle and boundary design of the system software for test system of the performance core of security valve are introduced in this paper.

介绍了安全阀铁心磁性能测试系统的结构、测量原理、系统软件界面设计。

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When the system pressure drops to the return pressure, the security valve will be closed and stop discharging, in the way of which the pipelines and equipments of the steam system will be protected.

当系统运行压力降低至安全阀的回座压力时，主蒸汽安全阀自行关闭，停止排放，从而对主蒸汽系统的管道和设备起安全保护作用。

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Ari Fleischer, President Bush's spokesman, said the goal of the executive action is to "provide a safety valve" if any national security issues might arise by releasing past presidential records.

CNN: Bush aides move to put hold on some papers of past presidents

Tyco (NYSE:TYC) spun off its ADT Corp. (NYSE: ADT) alarm security business as a separate public company on October 2 after selling its pipe and valve business earlier this year to pump maker Pentair.

FORBES: Corporate Castoffs Can Be Keepers