High vacuum oil diffusion unit AVDM-250 consists of the oil diffusion pump NVDM-250, liquid nitrogen trap LA 250 or flow trap LP-250R for reduction of operating liquid vapor return flow to pumped vessel and vacuum gate valve 2ZVE-250R for shutting off the inlet port of unit.

AVDM-250 responds to the requirements of the specifications TU 3648-035-00218526-2002.