Plunger pump cylinder for use in treating highly corrosive fluid

Claim 1

A plunger pump adapted for pumping corrosive fluids comprising a cylinder body having a cylindrical bore with a first section of uniform diameter and a second section of a smaller diameter than said uniform diameter, said cylinder body further having an inlet port perpendicular to said first section; a valve seat body mounted within said first section of said cylindrical bore and having a longitudinal bore therethrough; a delivery flange attached to said cylinder body; a first packing disposed between said delivery flange and said valve seat body; a delivery valve urged against a seat on said valve seat body, a stuffing box attached to said cylinder body; a second packing disposed between said stuffing box and said cylinder body; a plunger positioned within said stuffing box and adapted to move into said second section of said cylindrical bore; a suction valve support member mounted within said first section of said cylindrical bore of said cylinder body; a suction valve above said suction valve support member; means to urge said suction valve toward said valve seat body; said suction valve having an opening therethrough less than the diameter of said longitudinal bore of said valve seat body; at least one fluid passage through said valve seat body from said suction valve support member to said inlet port; and an annular groove around the inner periphery of said cylinder body and communicating between said inlet port and one end of said at least one fluid passage; said valve seat body and said suction valve support member being dimensioned to slidingly fit within said first section of said cylindrical bore.