inner seat ring
... inner screen 内层筛管 inner seat ring 内座环 inner shelf deposit 内陆棚沉积 ...
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蜗壳内充水保压系统，主要包括加压水泵及其控制装置、蜗壳进口闷头、座环密封环等组成。
The water filling and pressure maintaining system mainly included: pressure pump and its control device, blockage end at the spiral case inlet, sealing ring on the stay ring of turbine, etc.
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