Las válvulas distribuidoras pueden clasificarse en dos grupos means "The distributor valves can be classified into two groups"
1. the mother of my mother my aunt my grandmother my sister-in-law 2. the husband of my sister my cousin my brother-in-law my grandchild 3. the wife (wife) of my son my mother my daughter-in-law my stepdaughter 4. the husband of the sister of my father my uncle my cousin my twin 5. the son of my son my uncle my nephew my grandchild 6. the daughter of my uncle my cousin my aunt my sister-in-law 7. the father of my father's father my step-father my great-grandfather my grandfather 8 my son's husband my son my stepson my son-in-law
The answer to your question is Surge