Before boiler working, pull the haulm of safe valve by hydraulic motor set until the safe valve spring.

在锅炉未点火启炉之前，采用液压马达助力装置主动提拉安全阀阀杆，使安全阀开启。

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The paper also analyzes the dynamical characteristics of the pressure-adjusting safe valve and optimizes it.

本文还对调压保险阀做了动态特性分析和结构优化。

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There is safe valve in the pump. It can protect the system to avoid damage at over pressure and it can be overflow automatically.

泵设有安全阀，可保护系统不受超压的损坏，自动溢流。

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Safe to say that the Department of Defense does not have a submersible with arms to shut off the valve of a deep-water oil well.

WHITEHOUSE: Aboard Air Force One En Route Andrews Air Force Base