... 直接作用式压力调节器：directaction pressure controller 直接作用式安全阀：direct-operated relief valve 直接作用的：direct-acting ...
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direct operated proportional relief valve 直动比例安全阀
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There are four types for PWR pressure-relieving devices: direct acting safety valve, pilot-operated pressure relief valve, power-operated pressure relief valve and safety valve with auxiliaries.
PWR的压力释放装置主要有四种类型：直接作用式安全阀、先导操作压力释放阀、动力作用式压力释放阀和具有辅助装置的安全阀。
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