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Link Hi I think video may help https://youtu.be/7Ts0Tq2KOY0

U can find information on https://www.eurotherm.com/in/glass-news-in/glass-industry-glossary-of-terms/ https://www.us.schott.com/d/tubing/ffed51fb-ea4f-47d3-972e-5a2c20f123f5/1.2/schott-brochure-technical-glasses_us.pdf

The main reasons are To minimize the starting torque on the motor. To load the delivery pipe network gradually if it is the only pump that feeds the network. If it is a parallel connected pump, this method will insure against any reverse flow due to malfunctioning of upstream side check valve.