如果上游压力会超过D101的设计压力则会给安全阀的调节带来出现意外堵塞的一种情况。
If upstream pressure can exceed D101 design pressure, it will add a block-in contingency to safety valve sizing.
安装在主管线内，防止上游压力降到预置最小压力以下。电磁阀的过载平衡功能使其能够进行电气开-关操作。
Installed in a mainline it prevents upstream pressure from dropping below a preset minimum. Solenoid override of the sustaining function allows for electrical on-off operation.
这样的设置，有望于提供海洋生物的栖息地和减轻每年有超过50万以上的水上游客访问这个地区所产生的、对天然珊瑚礁的压力。
It is hoped the installation will provide a habitat for Marine life, and relieve pressure on natural reefs from over half a million water-going tourists who visit the region every year.
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