The high resistance characteristic of the grease delivery process makes the centralized lubrication system easy to cause pipeline blockage during the grease supply process. The main objective of the present article is to design a non-spool relief valve device based on the round pipe. The plug shape characteristics of the grease flow in the tube are established by combining the hydrodynamic equation and the grease rheological model. The mathematical model, whose relationship between velocity and flow is derived, is established with the core pipe of the grease spool-less relief valve of flow resistance, so the factors affecting grease pipe flow are obtained. The numerical simulation method is used to simulate the lipid overflow process of the simplified model with different influence parameters. Tecplot 360 EX 2015 R1 is used as a post-processing software to derive velocity and pressure clouds for grease flow in a circular tube, to investigate the factors influencing the relief pressure and relief capacity of the relief valve, to derive general rules for grease relief pressure, grease relief capacity and grease flow pattern distribution, and to establish an evaluation model for the relief pressure and relief capacity of the relief valve. The performance research test platform of the grease spool-less relief valve is built, and NLGI1 lithium grease is selected to carry out the experimental study on the performance of the grease relief valve under different influence parameters. The safety, stability, and feasibility of the overflow valve working with the pumping system are verified.
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