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A reciprocating pump assembly has a pump housing with a crankshaft. A plunger is connected to the crankshaft for pumping a fluid through a cylinder. The cylinder has a fluid inlet port and an opening that provides access to the cylinder. A suction cover is mounted in the opening and has a hub that i

A reciprocating pump assembly has a pump housing with a crankshaft. A plunger is connected to the crankshaft for pumping a fluid through a cylinder. The cylinder has a fluid inlet port and an opening that provides access to the cylinder. A suction cover is mounted in the opening and has a hub that is coaxial with an axis of the suction cover. A suction valve stop is mounted adjacent one of the fluid ports and has a spring retainer. A column extends from the spring retainer, and a bushing is mounted to the spring retainer for engaging and being retained by the hub of the suction cover. The suction cover guides the suction valve stop in operation and, when the suction cover is removed from the opening, the suction valve stop is removable.

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What is claimed is: 1. A reciprocating pump assembly, comprising: a pump housing that houses a crankshaft; a plunger mechanically connected to the crankshaft for pumping a fluid through a cylinder, the cylinder having fluid ports for ingress and egress of fluid, the plunger being movable in forward

What is claimed is: 1. A reciprocating pump assembly, comprising: a pump housing that houses a crankshaft; a plunger mechanically connected to the crankshaft for pumping a fluid through a cylinder, the cylinder having fluid ports for ingress and egress of fluid, the plunger being movable in forward and rearward directions along a pathway; an opening in the cylinder for providing access to the cylinder, the opening having an axis; a suction cover mounted in and closing the opening and having an axis and a hub having an axis that is coaxial with the axis of the suction cover; a suction valve stop mounted adjacent one of the fluid ports and below the pathway of the plunger; and a column having a lower end portion joined to a forward edge of the valve stop and an upper end portion that slides into concentric engagement with the hub. 2. The reciprocating pump assembly of claim 1, wherein the column has an axis that is perpendicular to the axis of the suction cover. 3. The reciprocating pump assembly of claim 1, wherein the column extends generally parallel with an axis of the suction valve stop. 4. The reciprocating pump assembly of claim 1, wherein the hub protrudes from a central recess formed in a body of the suction cover, the central recess being axially recessed in the suction cover such that the hub coaxially protrudes from the suction cover and the central recess. 5. The reciprocating pump assembly of claim 1, wherein the axis of the suction cover is concentric with the axis of the plunger. 6. The reciprocating pump assembly of claim 1, wherein the upper end portion of the column comprises a bushing. 7. The reciprocating pump assembly of claim 1, wherein the hub is cylindrical and has an outer diameter smaller than the opening in the cylinder. 8. In a reciprocating pump assembly having a pump housing that houses a crankshaft, a plunger connected to the crankshaft for pumping a fluid through a cylinder, the cylinder having fluid ports for ingress and egress of fluid, and an opening in the cylinder for providing access to the cylinder, the opening having an axis, the improvement comprising: a suction cover mounted in the opening and having an axis and a cylindrical hub protruding therefrom into the cylinder, the cylindrical hub being coaxial with the axes of the opening and the suction cover; and a suction valve stop mounted adjacent one of the fluid ports and having a spring retainer for retaining a spring relative to said one of the fluid ports, a column extending from the spring retainer, and a cylindrical bushing mounted to the column for engaging and being retained by the cylindrical hub of the suction cover, such that the suction cover guides the suction valve stop in an operational position and, when the suction cover is removed from the opening, the suction valve stop is movable to non-operational position. 9. The reciprocating pump assembly of claim 8, wherein the spring retainer has an axis, the colunm extends axially from the spring retainer but is laterally offset from the axis of the spring retainer such that the column is eccentric relative to the axis of the spring retainer and perpendicular to the axis of the suction cover, and the cylindrical bushing has an axis that is oriented perpendicular to the axis of the spring retainer and concentric with the axis of the opening. 10. The reciprocating pump assembly of claim 8, wherein the axis of the opening is coaxial with an axis of the cylinder. 11. The reciprocating pump assembly of claim 8, wherein a clearance between the suction cover and the suction valve stop compensates for wear between the cylinder and the suction valve stop, and maintains engagement between the suction cover and the suction valve stop during operation, such that the suction cover continues to guide the suction valve stop. 12. The reciprocating pump assembly of claim 8, wherein the cylindrical hub protrudes from a central recess formed in a body of the suction cover. 13. The reciprocating pump assembly of claim 8, wherein the column of the suction valve stop is perpendicular to the axis of the opening and parallel to an axis of to said one of the fluid ports. 14. The reciprocating pump assembly of claim 8, wherein the suction valve stop exerts no torque on the suction cover, such that the suction cover is void of anti-rotation devices. 15. A reciprocating pump assembly, comprising: a pump housing that houses a crankshaft; a plunger mechanically connected to the crankshaft for pumping a fluid through a cylinder, the cylinder having an axis and fluid ports for ingress and egress of fluid; an opening in the cylinder for providing access to the cylinder, the opening having an axis that is coaxial with the axis of the cylinder; a suction cover mounted coaxially in the opening and having an axial central recess, a cylindrical hub protruding from the axial central recess into the cylinder, the cylindrical hub being coaxial with the axis of the opening; a suction valve stop mounted adjacent the fluid port for ingress and having a spring retainer for retaining a spring relative to the fluid port for ingress, a column extending from the spring retainer, and a cylindrical bushing mounted to the column for engaging and being retained by the cylindrical hub of the suction cover, such that the suction cover guides the suction valve stop in an operational position and, when the suction cover is removed from the opening, the suction valve stop is movable to non-operational position; and wherein the suction valve stop exerts no torque on the suction cover, such that the suction cover is void of anti-rotation devices. 16. The reciprocating pump assembly of claim 15, wherein the spring retainer has an axis, the column extends axially from the spring retainer but is laterally offset from the axis of the spring retainer such that the column is eccentric relative to the axis of the spring retainer, and the cylindrical bushing has an axis that is oriented perpendicular to the axis of the spring retainer and coaxial with the axis of the opening. 17. The reciprocating pump assembly of claim 15, wherein a clearance between the suction cover and the suction valve stop compensates for wear between the cylinder and the suction valve stop, and maintains engagement between the suction cover and the suction valve stop during operation, such that the suction cover continues to guide the suction valve stop. 18. The reciprocating pump assembly of claim 15, wherein the column of the suction valve stop is perpendicular to the axis of the opening and parallel to an axis of the fluid ports.