The retaining ring is an important part of the waterjet intensifier pump that helps hold the plunger assembly in place during operation. The plunger assembly, including the plunger, seal, and other waterjet accessories, is subjected to very high pressure during operation, and the retaining ring helps prevent it from loosening or shifting.

Specifically, the retaining ring is located on top of the waterjet pump, just above the plunger assembly. It is designed to fit in a groove in the body of the waterjet intensifier and holds the plunger assembly in place by applying a constant force to the plunger assembly. This helps ensure that the plunger assembly remains in the correct position during operation, which is critical for consistent water pressure and cutting accuracy.

Retaining rings are typically made of high-strength materials such as stainless steel and are designed to withstand the high pressures and stresses of the waterjet cutting process. It is important to check the retaining rings regularly and replace them when they show signs of wear or damage, as damaged or worn retaining rings can lead to poor cutting performance and even pump failure.