... sealing system, increased tightness of the door; 3.Specially designed double retarders, running at adjustable speed, ensure driving more stable, ... and good tightness when the door closed.7.Specially designed return air system, ensure the balanced and all-around ... , medicine, pesticide, etc.technical parameters of ruiyuan 1000kg double shaft powder mixer Model MJ-300MJ-500MJ-1000MJ-1500MJ-2000Capacity ...