US Patent 8069923 Top suction fluid end

A positive displacement wellbore servicing pump having a power end and a fluid end is disclosed. The fluid end has a main chamber and a suction bore in fluid connection with the main chamber and the suction bore has a suction central axis vector. A discharge bore is in fluid connection with the main chamber and the discharge bore has a discharge central axis vector. A portion of the suction central axis vector is vertically higher than any portion of the discharge central axis vector. A method of providing a wellbore servicing fluid to a wellbore is also disclosed. A method of providing a wellbore servicing fluid to a fluid end of a positive displacement pump is also disclosed.