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.
由于先导卸荷阀5内的单向阀作用，可以实现系统保压而油泵卸荷。
The pilot unloading valve 5 of the one-way valve can be achieved system-pressure pump and unloading.
采用单向阀通道降低液压系统内的液压流体的压力波动，保证了气门的平稳开启。
Pressure fluctuation of the hydraulic system is reduced by one-way valve to protect the valve steadily opening.
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