... value 0.6-0.9MPa) Structure:mainly by whole vision mask, demand valve, pressure reducer,warning ... frost". For valve and full mask as an organic whole, the under view is good,the space is ... 1000L/min. Pressure gauge and alarm are the organic wholerepeatedly, set in the user's chest ... changeful form, electrostatic discharge and heat insulation, the whole backboard weigh 0.6kg, the same backboard suiiontable ...