Self-aligning reciprocating plunger pump

Claim 1

A combination of a reciprocating plunger pump and a water jet discharge device comprising: a fluid inlet passage and a fluid outlet passage, a main valve, a control valve, a jet pipe, a plurality of cylinder-plunger-push rod-cam assemblies, each of said assemblies comprising a push rod adapted to reciprocate in response to movement of a camming member, a cylinder provided with an abutment and communicating with said inlet and outlet passages, a plunger adapted to reciprocate in said cylinder and being provided at its lower end with a flange having an arcuately shaped base portion, and a spring provided between said flange and said abutment on said cylinder for urging said arcuately shaped base portion of said flange against said push rod, a first fluid passage coupling said fluid outlet passage to the input of said main valve, a second fluid passage coupling the output of said main valve to an input of said control valve, a third fluid passage coupling the output of said control valve to said jet pipe, a casing for housing said fluid inlet passage, said fluid outlet passage, and said plurality of assemblies, and a casing cover detachably fastened to said casing, said main valve and said control valve being attached to said casing cover and communicating with said first, second and third fluid passages.