求翻译：退出流程：压缩机关闭——(延时20秒)外风机关闭——(40秒后)水泵关闭——(30秒后)四通阀启动——（30秒后）四通阀关闭。是什么意思？

Exit process: compressor off - (delay 20 seconds) outside the fan off - (40 seconds) the pump off - (30 seconds) four-way valve start - (30 seconds) four-way valve is closed.

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Withdrawal flow: After after after compressor shutting down - - (time delay 20 seconds) outside air blower shutting down - - (40 seconds) water pump shutting down - - (30 seconds) the four-way valve starts - - (for 30 seconds) four-way valve shutting down.

Exit process: the compressor shut down--(delayed 20 seconds) fan off--(40 seconds) pumps shut down--(30 seconds) start--four-way valve (30 seconds) four-way valve to close.

Withdraw from the procedure: The compressor is shut off --(delay time for 20 seconds) the other air blower close --(40 seconds later) the water pump is shut off --(30 seconds later) Sitong valve is started --(30 seconds later) Sitong valve closes.