Question When loading compressed gas, the liquid discharge valves should be: Answers Closed. Removed. Opened. Explanation On a compressed gas tank, liquid discharge valves must always be kept closed, except during loading and unloading. Take a FREE Practice Test Now This questions appears in the following tests: Alabama HazMat , Iowa HazMat , Louisiana HazMat , Missouri HazMat , Ohio HazMat , Rhode Island HazMat , South Dakota HazMat , Vermont HazMat , Washington HazMat ,