| 摘要 |
<p>A pressure control arrangement for a fluid line in a system, particularly a pressure swing adsorption system, wherein, in the event of a valve or control system malfunction, there is a risk of the fluid line being subject to an overpressure in an excess of its maximum design pressure, has normally open valve means, flow restricting means, and pressure sensing means disposed in the fluid line. The pressure sensing means are disposed upstream of the flow restricting means and arranged to sense the pressure in said line and to actuate said valve means to close said line in the event of the sensed pressure exceeding a predetermined limit. The predetermined limit is above the normal operating pressure range of the fluid line but below the maximum overpressure to which there is a risk of said line being subject, and that portion of the fluid line upstream of said flow restricting means is constructed to have a maximum design pressure at least equal to the maximum overpressure.</p> |
