The letdown back-pressure regulating valve maintains pressure in the section of letdown upstream or the letdown heat exchanger to prevent the letdown liquid flashing to steam.
下泄背压控制阀维持下泄流上游段或下泄热交换器处的压力，防止压力过低引起流体汽化。
Open the fore and rare valves of steam pressure regulating valve slowly after pressure is stabilized;
待压力稳定后，缓慢打开蒸汽调压阀前阀，蒸汽调压阀后阀。
Open the fore and rare valves of steam pressure regulating valve slowly after pressure is stabilized;
待压力稳定后，缓慢打开蒸汽调压阀前阀，蒸汽调压阀后阀。
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