Wow, you’re gonna make me have to think back into my brains archives. I think the SS valve was a little balance valve. It required very little effort to open. I believe you tuned them with a jet, think carburetor, instead of a valve return spring. The jet size was determined by the smart guys at JSAR. When you build your own balance valve, you have to play with the jet size to get it opening and closing at its peak. It was a bit of a craze at one time to try and build a balance valve for anything that fired a pellet because of how good they worked when you got it right. The SSG is just a spring stopping guide. My rule of thumb is if your gun costs less than a grand, it needs one.
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