With a high pressure (pressure 0.6-1.0MPa) gas cooling function,it is used for vacuum gas-quenching, annealing, brazing of high- Models: WZDGQ ... -20, WZDGQ-30, WZDGQ-45, and WZDGQ-60.With a high pressure (pressure 0.6-1.0MPa) gas cooling function, it is used ...