Do you currently have car insurance? Insurance is mandatory to drive in California Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question When loading compressed gas, the liquid discharge valves should be: Answers Removed. Closed Opened. Explanation Keep liquid discharge valves on a compressed gas tank closed except when loading and unloading. Take a FREE Practice Test Now This questions appears in the following tests: Alaska HazMat , Idaho HazMat , Iowa HazMat , Kentucky HazMat , New Mexico HazMat , Virginia HazMat ,