High vacuum oil diffusion unit AVDM-400 consists of the oil diffusion pump NVDM-400, liquid nitrogen trap LA 400 or flow trap LP-400R for reduction of operating liquid vapor return flow to pumped vessel and vacuum gate valve 2ZVE-400R for shutting off the inlet port of unit.

AVDM-400 responds to the requirements of the specifications TU 3648-035-00218526-2002.