perma USA - Sales & Support - FAQ
I have used the spring-type lubricators. Are they like the perma?
Answer
In principle they are similar; in performance, they're quite different. The springs work on a tension method and may release all the lubricant too quickly if you have a bad or weak seal. If there is no place for the grease to go, you risk the possibility of the grease sitting and separating. Remember, a spring-loaded unit depends on the pressure in front of the piston for its rate of dispense. The perma depends on the pressure behind the piston (the rate of gas expansion for the CLASSC / FUTURA / FROST, or the timer cycles for the STAR series) to push out the grease in metered amounts.
