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The working principle of the air pump is: the engine drives the air pump crankshaft through two V-belts, so as to drive the piston to pump air, and the air that is injected is introduced into the air reservoir through the pipeline. On the other hand, the gas storage tube also guides the gas in the gas storage tube to a pressure regulating valve fixed on the gas pump through an air pipe to control the air pressure in the gas storage tube. When the pressure within the gas storage pressure regulator does not meet the regulation of the pressure regulator, the gas into the regulator from the gas cylinder valve can not be opened when the pressure regulator valve; when the pressure regulator within the gas cylinder to adjust the pressure , From the gas cylinder into the pressure regulator valve to open the top of the gas valve, into the air pump connected to the pressure regulator valve airway, and through the airway control of the air intake of the pump normally open, so that air pump load operation , To reduce power loss, the purpose of protecting the pump. When the gas pressure in the gas storage tank is lower than the pressure set by the pressure regulating valve because of the loss, the valve in the pressure regulating valve will be returned by the return spring to disconnect the control gas circuit of the gas pump, and the gas pump starts to pump gas again.