| http://www.w3.org/ns/prov#value | - irst and a second semi-annular recess connectable respectively to one of said pressure lines and one of said return lines, said valve body having a first internal chamber connectable with the recess connectable to said return line, said semi-annular recesses and said chambers being so disposed about said cylindrical valve body and having such volume as to substantially equalize the pressures exert
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