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A high pressure reciprocating pump has a flange plate or mounting plate secured to the plunger end of a pump drive housing and a suction and discharge manifold is hingedly connected thereto. A stuffing box in bores in the flange plate has a central bore receiving one end of the plunger and forming a

A high pressure reciprocating pump has a flange plate or mounting plate secured to the plunger end of a pump drive housing and a suction and discharge manifold is hingedly connected thereto. A stuffing box in bores in the flange plate has a central bore receiving one end of the plunger and forming a plunger pressure chamber coaxial with the plunger. A tapered packing assembly in the stuffing box surrounds the plunger in reciprocal sealing relation. A suction and discharge valve cartridge in one or more valve cavities in the manifold block is coaxial with the plunger. The hinged connection clamps the stuffing box in the flange plate for pivotal movement permitting clear access to the stuffing box and the valve cartridges whereby either may be removed as a unit for easy field maintenance. The valve cartridge comprises a common seat member with a suction valve and a discharge valve movably mounted thereon coaxial with the plunger and positioned concentric and radially spaced on the seat. When assembled, the valve cartridge is mechanically biased in the cavity by the stuffing box. The seat member has seals positioned to seal the cavity and the stuffing box around the pressure chamber. The seals are sized and positioned such that the valve cartridge is hydrostatically biased and urged toward the stuffing box by fluid pressure during operation of the pump plunger.

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In a high pressure reciprocating fluid pump including a pump drive housing having at least one reciprocating plunger extendable out of one end thereof; a mounting plate secured to said drive housing plunger end having a first face perpendicular to the axis of said plunger in contact therewith and a

In a high pressure reciprocating fluid pump including a pump drive housing having at least one reciprocating plunger extendable out of one end thereof; a mounting plate secured to said drive housing plunger end having a first face perpendicular to the axis of said plunger in contact therewith and a second, parallel face with at least one bore extending therethrough in axial alignment with said plunger, stuffing box means releasably received in said mounting plate bore and having one end extending into said pump drive housing and a central bore slidably receiving one end of said plunger, packing means surrounding said plunger in reciprocal sealing relation a pressure chamber in said stuffing box means at the opposite end of said central bore coaxial with said plunger, suction and discharge manifold means comprising block means secured on said mounting plate second face and having at least one interior cavity substantially coaxial with said stuffing box means central bore and having suction and discharge manifolds therein opening into the end of said cavity opposite said plunger, and a unitary suction and discharge valve cartridge assembly in said manifold means interior cavity abutting said stuffing box means and aligned with said plunger and said pressure chamber, and including a suction valve and a discharge valve movably mounted on a common seat member to control fluid flow into and out of the end of said cavity. A suction and discharge valve cartridge assembly for installation in a valve manifold apparatus having at least one valve cavity in communication with suction and discharge port passageways and the manifold apparatus of the type used in a high pressure reciprocating fluid pump having a pump drive housing and at least one reciprocating plunger extending through stuffing box means, the valve cartridge assembly comprising; a generally cylindrical seat member having a central bore extending therethrough, a suction valve seat surface and a discharge valve seat surface concentric and radially spaced relative to one another, a suction valve member and a discharge valve member movably mounted on said seat member relative to said suction valve seat surface and said discharge valve seat surface respectively, said suction valve and said discharge valve members positioned concentric and radially spaced relative to one another on said seat member and coaxial with the seat axis, and said suction valve having a surface opposite said seat surface substantially coplanar with one end of said cylindrical seat member.