Self-Priming Pumps Which is better?

All self-priming pumps are not created equal though. Wet prime pumps can also be split into two categories. “Standard” self-priming pumps and those that are “guaranteed” to re-prime after each and every priming cycle is completed.

All wet prime pumps can produce a high vacuum when their casings are completely full, but in an unattended “pump-down” application where solids are present in the pumped fluid, solids can lodge in the pump’s suction check valve at the completion of a pumping cycle, causing the suction leg to drain, which in turn causes a siphoning of the pump casing. “Standard” self-priming pumps will not retain enough liquid to “guarantee” re-priming – particularly on a high suction lift.

“Guaranteed re-primers”, like Gorman-Rupp’s Super T and Ultra V series pumps, are guaranteed to reprime to levels published on their performance curves. Because of this capability, these pumps can be relied upon to operate automatically every single time at an unattended site.