Functions of the “export drain pipe” and “return pipe” of the oil pump in the jacking oil pump

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The return pipe of the jacking pump is equipped with a manual return valve. This valve ensures that the outlet valve of the jacking pump can still be activated in order to start the pump for testing purposes, even when it is closed. To ensure the safe operation of the jacking pump and prevent overheating due to a lack of flow, the return valve is usually kept in an open position during normal operation, thereby maintaining a slight flow of fluid and avoiding the accumulation of oil and debris inside the pump over time. The function of the recirculation pipe is to allow the recirculation valve to open automatically when the oil pressure in the jacking oil outlet header or tank becomes too high, thereby preventing excessive jacking oil pressure. The pressure value at which the recirculation valve (which previously used springs) operates is determined based on the requirements of the manufacturer and the plant. Return oil pipe: It serves primarily as a circuit for the lubricating oil needed to keep the jacking oil pump operating. When the jacking oil pump is in use, the sliding shoes and pressure discs rotate at high speeds; to ensure lubrication of their end surfaces, some oil is used for this purpose, and then that oil is returned to the return oil pipe. The starting drain valve of the main oil pump functions like a tee: one end is connected to the main oil pump, another end to the starting oil pump, and the third end is connected to the lubricating oil return pipeline. Its main purpose is to allow bubbles to be discharged smoothly when the main oil pump does not operate properly during startup. Bubbles can also form during the startup of the high-pressure oil pump, and this valve helps ensure that the high-pressure oil pump operates properly.