功率变压器和扼流圈装置- - -第5部分：液体高度，压力流动指示计，压力释放装置和脱水器。
Power transformer and reactor fittings — Part 5: Liquid level, pressure and flow indicators, pressure relief devices and dehydrating breathers.
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。
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.
释放单向阀用于释放管柱内的压力使装置顺利从套管中提出。
The releasing one-way valve is used to release the pressure from the casing string and pick up the device properly.
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