Updated information on Kalsi Seal breakout torque


The Kalsi Engineering rotary seal handbook has been updated to revision level 24. The most significant revisions involve Chapter C12, “Kalsi Seal breakout torque” and Chapter D21, “Sticky drawer effect”. Minor technical, editorial, and/or cosmetic changes were also made to Chapters D11 and D15, and to Appendices 3 and 5.

Chapter C12 includes updated breakout torque test data showing the effect of differential pressure and lubricant viscosity on breakout torque. The data is more bounding, compared to the breakout torque presented in previous revisions. This chapter will continue to be updated as additional testing is performed. Our objective is to provide our customers with data from a wide range of test conditions, to aide in the selection of the most appropriate seal geometry and material combination for breakout torque sensitive applications.

The new Chapter D21 discusses the “sticky drawer effect”. This effect is most commonly encountered where a cocked, partially open wooden drawer will not close, no matter how much closing force is applied. The same effect can occur in piston type lubricant reservoirs and other mechanisms. This chapter explains how to avoid the “sticky drawer effect”.