... dischange valve for above three mud pumps are interchangeable. F-500 mud pump uses API#5 valve pot, F- ... 800 and F-1000 mud pumps use API#6 valve ... sealing.Notes: Cylinders, liners, pistons, valves, valve seats, valve springs, seal rings, valve covers and cylinder ... on the suction manifold of the mud pump, the charging pump is driven by the special purpose motor ...