Is there a positive displacement pump that experiences only rolling resistance? One with no sliding friction and diaphragm stretching?
Rolling diphragms have been around for many years now. See... https://www.diacom.com/rolling-diaphragm-theory
With or without the spring.
(With enough vacuum in the top you can get the membrane to slip upwards, but it is easily reset by cycling.)
Fabric reinforcement helps prevent stretch, but generally everything is elastic to some extent.
Additionally, https://www.airpot.com/ has made some innovative low friction graphite/glass piston/tube cylinders that I haven't tried with fluids other than air.
Progressing cavity pumps. The rotor executes a rolling motion in the stator, because of the different auger like shapes of rotor and stator the cavity between moves along the axis. This video shows the movement.