As upstream pressure increases, the diaphragm pushes against the spring.

当上游压力增加, 隔膜就像弹簧施加推力.

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Upstream pressure is sensed under the diaphragm.

上游压力在隔膜下被感应到.

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Installed in a mainline it prevents upstream pressure from dropping below a preset minimum.

安装在主管线内,防止上游压力降到预置最小压力以下.

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Equipped with a pressure sustaining control which prevents upstream pressure from dropping below a preset minimum.

配置压力平衡控制器,防止上游压力下降到预先设置的最低压力以下.

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