When operated the tube on the bottom and back by, the oil is oil pipe piston cornered flows into the cavity I and II cavity of the tube on, pressed the check valve out and then flows into the cavity III through the gap between regulatory officials and regulators. Oil pressure pushes Pistons drifting to the left and rolled the same moderator moved under pneumatic presses, in compartment IV. When rolling the throttle to shift relative to the ring to make the hole area flowing between regulatory officials and regulators gradually small round again. Oil line flow through this gap with compressed air in the compartment IV created drag back.
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