1. When the DVE vacuum pump pumps air out of the tank and reaches a certain negative pressure for the slag suction operation, usually close the back-end valve first, and then stop the DVE vacuum pump. At this time, there is still a certain degree of vacuum in the tank, and mechanical oil will be sucked into the tank (visible through the steel wire hose for connection).

2. When the DVE vacuum pump pumps air into the tank and sprays, because the vehicle is walking on the field, there is bound to be a gear shift requirement, but the pump will stop when the clutch is stepped on. If the DVE vacuum pump stops running, it will cause a large amount of mechanical oil to be sprayed outside.

Because the rotary vane DVE vacuum pump needs a certain amount of mechanical oil for lubrication and sealing when working, the existence of the above two phenomena will cause the loss of more than 1L of stored mechanical oil, which requires continuous supplementation by the operator. This will not only cause great Manpower and material resources are wasted, reducing work efficiency and even damaging DVE vacuum pump parts, which will also cause certain pollution, which severely restricts the promotion and use of this type of vehicle. In order to overcome the above problems, some companies use modified air compressors to replace DVE vacuum pumps, but the production costs have increased significantly, and the air compressors are too large and difficult to layout.
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