Beyond Petroleum Equipment

14

2021

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01

What is the main reason for the leakage of the mud pump accessory valve box? How to extend the service life?

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The mud pump accessory valve box is an important component of the hydraulic end of the mud pump.

The mud pump accessory valve box is an important component of the hydraulic end of the mud pump. Due to the working conditions of the mud pump valve box being high pressure, high sprint, high wear resistance, and other harsh working environments, the valve box is a vulnerable component that needs to be replaced frequently during the maintenance and repair process of the mud pump.
The main reasons for the leakage of the mud pump accessory valve box are: long-term high-pressure use, fatigue of the valve box material, and when penetrating cracks occur, the current conditions cannot be repaired.
Due to the extremely harsh working conditions of the drilling pump valve, there is an impact on the valve disc and valve seat of the discharge and suction valves during each stroke. The higher the pump speed, the greater the impact and erosive wear. Because of this, the working stroke of the 3NB Qingzhou drilling pump is not very high. Even so, the working life of the drilling pump valve is still very short, which is one of the weak links in the drilling pump. The valve disc and valve seat need to be replaced frequently during work.
Method to extend the service life of mud pump accessory valve box:
According to the use and maintenance of the mud pump accessory valve box, most leaks occur on the installation surface of the valve seat and valve box. Therefore, it is necessary to regularly replace the valve seat. At the same time, check the inner and outer walls of the valve box, install and replace the valve disc. When installing the valve seat, clean the valve seat to ensure that the mounting surfaces of the valve box and valve seat are clean and dust-free. There should be no rust proof oil or any oil stains on the valve seat. By correctly installing and replacing the valve disc, carefully inspecting the valve seat and valve box, the fatigue limit of the valve box can be reduced, thereby extending the service life of the valve box.
When the valve box of the mud pump accessory leaks, the current repair method is welding, but the effect is average. Usually, a surface with leakage and obvious cracks can be used after the crane, and then welded to the original size. Therefore, a good welding repair process has certain value in extending the service life of the overhauled valve box. However, the penetrating cracks cannot be seen with the naked eye. It is difficult to fundamentally solve problems based on maintenance experience now.

 

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