Troubleshooting of Oil Outlet Valve of Volvo Diesel Generator

Jan. 14, 2022

In the project construction, the oil outlet valve of Volvo generator set is mainly to isolate the high-pressure oil pipe from the cavity at the upper end of the plunger when the power supply is stopped, so as to prevent the oil in the high-pressure oil pipe from flowing into the generator fuel injection pump. For the analysis of the maintenance of vulnerable parts of oil outlet valve coupling parts, Dingbo power is introduced!


1. Easily worn parts of oil outlet valve couple of Volvo generator set in project construction


A. Easily worn parts of the valve seat: at two places: the sealing cone and the guide hole.

B. Easily worn parts of coupling parts: sealing cone, pressure reducing ring belt and guide excircle. Among them, sealing cone and pressure reducing ring belt are more easily worn.


Volvo power generators diesel


2. The appearance inspection items and sealing inspection methods of the oil outlet room are as follows:


A. The sealing cone shall be free of wear marks, metal peeling and longitudinal scratches.

B. During the project construction, the oil outlet valve and valve seat cone of Volvo generator set shall not be rusted.

C. The oil outlet pressure reducing ring belt shall be free of wear marks.


3. Sliding inspection and repair methods of Volvo generator unit coupling parts in engineering construction


A. Sliding test method: place the cleaned coupling vertically, then extract 1 / 2 of the full length of the oil width in the vertical position, and loosen the oil valve after rotating at any angle. It is qualified if it can slide freely onto the reading seat by relying on its own quality; If blocking occurs during the sliding process, it is regarded as unqualified.

B. Repair method: after the sealing of the conical surface of the coupling becomes poor, clamp it on the grinder, apply a thin layer of grinding paste on the sealing conical surface, hold the reading seat by hand and close to the oil outlet valve, and then start the grinder for grinding. When there is no grinder, the moving method can also be used for grinding.


4. Impact caused by wear of coupling parts


The wear of the pressure reducing ring leads to the increase of the fit clearance between it and the reading seat hole, so that the lift of the oil outlet valve in the oil supply process is correspondingly reduced, the pressure reducing effect is relatively reduced, and the fuel injection pump stops supplying oil and high-pressure oil when supplying oil


The pressure of remaining diesel in the pipe increases, and the oil supply of diesel increases. When the diesel engine is running, there will be faults such as unstable speed, insufficient power and increased fuel consumption.


In the project construction, the sealing performance of the oil outlet valve coupling of Volvo generator set will deteriorate after the sealing cone is worn. When the fuel injection pump works, it will cause some diesel in the high-pressure oil pipe to flow into the plunger sleeve, reducing the oil pressure when the high-pressure diesel stops supplying oil. When the fuel injection pump injects fuel for the second time, the time for the diesel oil to rise from the lower oil pressure to the injection pressure increases accordingly, so the injection time lags behind and the fuel supply will be reduced accordingly.

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