Another tip: Close the ball valve to ~80 degrees where it still seals.
Spring does not have to pull that initial 10 degrees.
Believe it or not, this is a bad idea. Here is the argument.
2 cars are drag racing. One starts 20 feet behind the starting line and is permitted a rolling start. Neither car can cross the line early. Both cross the start line at the same time. One is traveling 40mph as it crosses. Which car will make the first 40 feet the quickest?
A running start before the valve cracks open is a good thing as the actual time taken to open is shortened once it actually cracks open.
All my valves are using a pre open travel distance for a running start when they do open.
I don't see it completely that way.
Both cars have the same acceleration and the head start car will beat the other car to the finish line. I agree.
The question is whether the time to reach 90 ft from 0 ft is shorter than the time starting from 10 ft to reach 90 ft.
Both valves will have the same acceleration.
Like a drag race, the shortest E.T. is the goal (assuming the same reaction time to green).
(Exchange degrees for feet)
Springs weaken as they retract.
Therefore the first 10* of rotation is acted upon by the strongest force.
I could be wrong.