if we find an equation for the time closed in terms of Vf and k we can find the max of this for a given k value and Vf. Vf can be replaced with its eqn which would give us an eqn in terms of head, pipe diam, headloss, etc.
-eqn for force from water as function of time, find intersection with spring force when open and spring force when closed?
if we find an equation for the time closed in terms of Vf and k we can find the max of this for a given k value and Vf. Vf can be replaced with its eqn which would give us an eqn in terms of head, pipe diam, headloss, etc. -eqn for force from water as function of time, find intersection with spring force when open and spring force when closed?