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If I change my design to single acting, where I don't have to have a seal around the rod at the end closest to the center, I can run a much more robust rod. I could also dispense with the inboard cylinder caps and half of the valve bodies. comments please.
Angled yoke returns the pump ram quicker to the bottom ready for the slower upstroke that lifts the water, probably gives a slight mechanical advantage to the motor when under load on the up stroke too.