Anyone recognize this type of valve under kitchen sink and how it works? (Pic link)?

https://1drv.ms/u/s!AqXjQmAX3_ughzN0XYxu...
I need to shut the water off because the tap started leaking and it s Friday night, so no one I can call. These valves are all there is and I ve turned them with no result. I m afraid to turn them too far in case they come apart.
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