What is the primary function of a spacer ring in a pump packing gland?

The primary function of a spacer ring in a pump packing gland is to improve seal water distribution. When water or lubrication is distributed evenly around the packing material, it helps maintain optimal operating conditions by cooling the packing and reducing friction. Proper distribution of seal water is essential for prolonging the life of the packing, preventing overheating, and minimizing wear on both the packing and the shaft. This, in turn, enhances the reliability and efficiency of the pump operation.

While the other choices relate to important aspects of pump design or function, they do not directly describe the role of a spacer ring. Aligning the motor shaft and preventing fluid leakage, for instance, are functions performed by other components or systems within the pump.