Modified vanadium compound, producing method thereof, redox flow battery electrolyte composite and redox flow battery electrolyte producing method.

摘要

PROBLEM TO BE SOLVED: To increase a pressure side rear surface damping force generated on the check valve side of a piston smoothly from a very low piston speed range when a hydraulic shock absorber is switched from an extending stroke to a retracting stroke. SOLUTION: Check valves CV are opposed to a plurality of upper side opening windows 105D, 105E, 105F, and 105G of a piston 105 are allowed to communicate with a lower chamber B through outer peripheral ports 105d, 105e, 105f, and 105g with hole diameters increased in order at the upper side opening window 105D with the maximum opening area toward the upper side opening window 105G with the minimum opening area. When a piston rod 1 is lowered, the check valves CV are opened in order at the upper side opening window 105D with the large opening area and the small opening pressure toward the upper side opening window 105G with the small opening area and the large opening pressure. The pressure side rear surface damping force based on a passage resistance from the lower chamber B to an upper chamber A is increased smoothly as the piston speed is increased.