With value system, I mean a pattern of thinking, a mindset. I am looking for different ways to look at quality and quality management, based on different values.
If you value order and structure and rules, you want a control quality system.
If you value success and winning, you want an improvement quality system.
I worked the edge of a university QM system for a bit. (My own role was liaison with industry an commerce.)
It looked to me as though (by identifying explicit objectives and stakeholders) the QM system was reaching towards a value-neutral evaluation of the university's undergraduates offerings. The question wasn't (to put it crudely) whether or not they were any good but rather: what objectives had been set by the university and whether, as a matter of fact, they had been met - possibly looking at that from the point of view of multiple stakeholders.
I hope you will agree with me that this is an academically / intellectually interesting move. From a certain point of view, the whole process is far from value-free. (ethnographically?) From another, it simply appears to be value-free by importing (perhaps uncritically) values from outside the QM process itself. From a third, and back to your question, QM sidesteps the apparent subjectivity of values and is an objective approach.
But maybe I'm talking about a whole different QM game than you?