High pressure pump

Abstract

A high pressure fluid pump 10 supplies fluids to a water blasting or cutting gun 14. The pump 10 is preferably of the in-line type, wherein both an inlet check valve 60 and a discharge check valve 62 move linearly along the axis 40 of the plunger 30 during a complete pumping cycle. A plurality of compression rods 42 are spaced circumferentially about a plunger housing 24, and press the plunger housing into sealing engagement with a suction valve seat 56, press the suction valve seat into sealing engagement with a pump discharge housing 36, press the pump discharge housing into sealing engagement with a discharge end plate 38. Seal ring 66 is provided for sealing between a front planar face 114 of the suction valve seat and a rear planar face 112 of the plunger housing. A weep path 116 extends radially outward from the seal ring 66 to release fluids which pass by the compressible seal ring. Plunger housing 24 is provided with a uniform diameter bore 106 extending axially between the plunger seal 54 and the rear planar face 112. A selected bearing material bushing 82 is provided within the plunger housing 24, and a high temperature seal ring 80 is spaced radially outward from a front portion of the bushing to prevent the bushing from becoming seized to the plunger housing. One or more rod front ends 140 may be interconnected with a corresponding compression rod 42 for attaching a support rod 46 thereto during a pump service operation. An alignment connector 28 structurally interconnects a pump rod 26 and a plunger 30, and further reduces the time and expense of pump maintenance.