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Why does this happen? This depends on how the relief valve works. The relief valve is a door leading to the low pressure chamber in the high pressure chamber of the oil pump. It mainly limits the maximum pressure of the hydraulic system and protects the hydraulic system, and can adjust the output of the dispenser. When the motor starts, when the pump is working, the pressure oil from the high pressure chamber of the pump will flow to the inlet of the oil separator and the left side of the relief valve. At this time, if the oil gun is opened, the pressure oil flows to the oil separator, the relief valve is closed, When the oil gun is closed, the pump oil can not be discharged from the pump outlet, the pressure in the hydraulic system rises rapidly, the pressure oil overcomes the spring force of the relief valve spring, so that the valve spool to the right , The relief valve opens, the high-pressure oil flows through the open relief valve to the low pressure chamber of the oil pump to realize the circulation within the oil pump. Diesel oil becomes very viscous (commonly known as "waxing") when winter temperatures are low, and oil flows slowly and increases resistance through the relief valve. After stoppage, the oil pump will continue to rotate due to inertia, the oil can not be discharged from the outlet of the pump, and can not pass the relief valve smoothly. The pressure of the oil rapidly increases, and the high-pressure oil will give the rotor a reaction force through the blades. So that the pump reverse phenomenon.
Why did the pump reverse after winter diesel tanker shut down?
In winter, maintenance personnel repair the dispenser, the test machine is often found hanging down after the pump, the pump stopped rotating before reversing two before stopping. Repair crews are unaware of the reasons and are worried that it will affect the tanker's normal work.