Stroke the valve open and closed several times, with no line pressure.
在没有任何管道压力状态下开启和关闭阀门几次。
Closed system, negative pressure operation, no dust emissions, a good operating environment.
系统全封闭，微负压操作，无粉尘飞扬，操作环境好。
Because the reaction vessel was closed, high temperature and pressure were produced in this system.
因反应器密封，故该体系产生了高温高压。
Because the reaction vessel was closed, high temperature and pressure were produced in this system.
因反应器密封，故该体系产生了高温高压。
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