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1·Higher fast-forward speed requested, quick exhaust valve can be configured (optional).

操作时如需快速下降， 可选配快速排气阀。

2·Air filtering pressure reducing valve, solenoid valve, valve location feedback device, valve gate locator, quick exhaust valce.

空气过滤器减压阀，电磁阀，阀位反馈装置，阀门定位器，快速排气阀。