So, as I will not be diving any time soon I've decided to conduct a preliminary test on land. I will preface the results by saying two things, firstly it did take more force than I had anticipated, I didn't expect it to turn to mush but it took more than I originally thought, so I sort of accept fault on that part. Secondly, although in previous threads I may have used words like shear etc., I was obviously, or maybe not so obviously exaggerating. The purpose of the test was to try and dislodge, shift, the yoke assembly to a point where it would develop a moderate leak, not a trickle. see the leak here:
The regulator was a brass mares mr12dfc
This was after it was struck 2 or so times with a metal tool, on the yoke handwheel, with a force equivalent of 5 newtons, or, wait for it, 1 pound force. Now when I saw this I had the same reaction that your having right now. It didn't make any sense to me either. So here is a good explanation of pound-force I found on quora.
The pound-force (lbf) is defined a bit differently than the Newton. One pound-force is defined. as the force required to accelerate an object with a mass of 1 pound-mass at a rate of 32.174 ft/s2. The number 32.174 comes from the acceleration due to gravity on Earth The pound-force (lbf) is defined a bit differently than the Newton. One pound-force is defined. as the force required to accelerate an object with a mass of 1 pound-mass at a rate of 32.174 ft/s2. The number 32.174 comes from the acceleration due to gravity on Earth A pound is a unit measurement of weight used in systems of measurement. ... An lbf, or a pound force, is the gravitational force exerted by a matter on the surface of the Earth. Thus, it is the force exerted by the mass of one avoirdupois pound. Thus, 1 lbf, or one pound force, can be measured or converted in Newtons.
An lbf, or a pound force, is the gravitational force exerted by a matter on the surface of the Earth. Thus, it is the force exerted by the mass of one avoirdupois pound. Thus, 1 lbf, or one pound force, can be measured or converted in Newtons. For example, 1 lbf = 0.45359237 kg × 9.80665 m/s² = 4.448 N, or one pound force is equivalent to the product of 1 avoirdupois pound and the force which is equivalent to the mass multiplied by the acceleration due to gravity.
I lied, this explanation didn't really help me. Now I tried calculating applied force, impact force, everything you can think of, and they all gave me a similar result. Now I imagine that I hit the yoke with 40-60 pounds of "weight".?.? I don't know anymore this whole physics thing messed me up. If you are a physicist and want to help here are some of the measurements:
Metal tool weighed 3.3lbs, swung with an acceleration of 9 ft/s^2, final impact speed of 3.5 mph, if you want more lmk.
After examining the yoke and valve, it appears the actual sealing surfaces were not significantly damaged, but the whole clamp assembly was bent in such a way that the sealing surfaces could not sit flush together anymore, thus the leak.
I don't know if or when ill do an in-water test, so I'll end on this. Every piece of modern equipment available will work, yoke, bcds, ffms, split fins (that one hurts to say), whatever, it all works. If I can find a better lbf explanation i'll post that, but for now im done, gn.