off-line cipher machine

An attached mechanical sealing is used during pump shut down.

该密封装置采用负压密封原理解决砂泵在运转过程中的密封问题,用外装式机械密封作为停车密封,使砂泵在运转和停机时都能可靠地密封钻井液,无故障运转时间超过3 500 h。