Does not exhibit easy damping oil flows from bottom to top and bottom in the twin-tube structure which exhibits a damping force less oil flows from top to bottom is adopted, in compression stroke valve if, but disadvantageous in terms large diameter of the flame KJ radiating shock absorber and the piston valve is MIL vehicle structure want to exert a damping force in the extension stroke, but that it shares the role with two valves: stable performance is exhibited, with I your thigh XI are often used.