This can be simply calculated by understanding the volumetric displacement [bore x stroke] x by the input RPM, however all such piston pumps suffer from
hysteresis '
being the delay in a suction valve closing at the commencement of the pressure stroke
[one way to understand this is to consider such as the pump design here operating at 200 RPM...which all sounds OK, but we must understand 200 divided by 60 = the suction valve and delivery valve are opening and closing 3.3' times per second]
The shorter the pump stroke, the greater this effect as a % of volume pumped
Why not ask the Manufacturer [Microcosm] to offer comment.......
We note that Regner publish displacement of their servo driven piston pump.......we also hear the sound of these units a mile away
I have two of the original Microcosm boiler water makeup pumps, [1 x electric motor speed reducer and 1 x bare shaft] however from day 1, experienced issues
The original design included superbly finished CNC barrel bolt sealing surfaces complete with an 8 x 4 x 0.5 Teflon flat seal.......on test, the barrel bolt on the discharge side weeped with the Teflon
flat seal being displaced and as such a factual pulsating test to 3 Bar pressure could not be achieved & the test aborted
To counter this weepage, I substituted
RED fiber washers for the Teflon washers........these fiber washers were too hard/stiff, resulting in snapping of the M4 barrel bolt, and only functional when soaked in water for 24 hours, however this I believed to be a poor solution
I understand the latest design of the M5 Microcosm pump has encapsulated o-ring sealed barrel bolts which should certainly resolve the sealing issueHowever it is noted that this latest variant has valve poppets with miniature o-rings for the suction and delivery valves over the stainless ball & Teflon seat in the earlier pumps
All of my attempted test results were communicated with Jin, however disappointingly I was never able to resolve an acceptable solution to my issue which was I suggest......defective designHaving said all of this, I needed to perform a hydrostatic test on the boiler so installed a Microcosm hand operated boiler pump and added a wooden surround....the pump works perfectly and is a fixture, not just for the testThe images are........
1. the original Microcosm pump Teflon barrel bolt sealing washer
2. one Microsom pump [electric speed reducer drive] with the
RED fibre washer
3. second Microcosm pump [paddle shaft direct drive] with the
RED fibre washer
4. the newer Microcosm M5 pump with improved sealing and poppet valves
5. Microcosm hand pump
6. Micrososm decorated pump body
Derek