n  Product Characteristics. n  n electronic vacuum degree display (other vacuum meters can be configured according to user requirements); n  n The sealing element has automatic compensation. Effectively used in vacuum, pressure conditions, to ensure that the vacuum pressure two do not leak, for vacuum, pressure dual-purpose special ball valve; n  n is equipped with various kinds of imported and domestic SF6 electrical equipment connectors; n  n Automatically vacuum according to the time or vacuum degree set by the user; n  n A variety of protection functions, effectively ensure the safe operation of vacuum pump; n  n easy maintenance, the devices are made of good performance parts, long time use without maintenance