Patent ID: 6568925
Filing Date: 2003-05-27
Classification: F04B,Y10S

Abstract:
A pump housing for an abrasive, viscous liquid pump, said housing comprising:a bottom housing portion having a first bottom end, a second bottom end and an outlet through a wall of said bottom housing portion and spaced from said second bottom end, said bottom housing defining a first cylindrical volume; and a top housing portion having a first top end and a second top end, said second top end removably connected to said second bottom end of said bottom housing portion, said top housing portion defining a second cylindrical volume having a smaller diameter than said first cylindrical volume wherein said first cylindrical volume communicates with said second cylindrical volume defining a two-tiered cylindrical volume for receiving a piston component having a first piston assembly sized to sealably engage against an inner surface of said bottom housing portion and a second piston assembly having a smaller diameter than said first piston assembly and sized to sealably engage against an inner surface of said top housing portion and to prevent the abrasive, viscous liquid within said pump from passing upwardly around said second piston assembly in response to downward movement of said piston component within said pump.