On 2013-12-07, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus31823 fired this volley in
:

Think some more, you will realize that what I want to do is the nicest
way of doing it.


If your pump cuts in at 90, then all you've done is complicate the system
without improving the performance. The INSTANT your system hits 120,
it'll dump _all_ your main tank capacity into the reserve until the
pressure drops to 90 -- then the electric valve turns off and the pump
starts to run again... it will not improve the length of time it takes to
get the reserve up to pressure.

Actually, if you think about it, the compressor will run continuously
from the time the pressure hits 120, until such time the reserve tank
is filled. All the while, the system pressure will never drop below
90.

During filling, no energy will be lost, unlike with restricted valves.

i