Coupling arrangement providing an axial space between a plunger and plunger adaptor of a high pressure fluid pump

1. A coupling of a pump connecting a plunger and a plunger adaptor, the coupling comprising:

a first body having a first recess into which a plunger flange of the plunger is received; and

a second body coupled to the first body, the second body having a second recess into which a plunger adaptor flange of the plunger adaptor is received;

wherein, in an installation orientation, the first recess and the second recess face in a first direction with a first angular orientation relative to a coupling axis,

wherein, in a locked orientation, the first recess faces in the first direction with the first angular orientation relative to the coupling axis, and the second recess faces in a second direction with a second angular orientation relative to the coupling axis, the first angular orientation is 180° opposite the second angular orientation, and

wherein the first body and the second body are adjusted 180° relative to one another to move from the installation orientation to the locked orientation, and wherein said plunger flange is in said first body recess and said adaptor flange is in said second body recess when said first body and second body are in said installation orientation and in said locked orientation.

2. The coupling of claim 1 wherein the first body includes

a first face surface extending radially from the coupling axis and perpendicular to the coupling axis;

an insert member extending axially away from the first face surface; and

a first aperture extending through the insert member into a central region of the first body.

3. The coupling of claim 2 wherein the first aperture includes threading disposed on an interior surface thereof.

4. The coupling of claim 1 further comprising at least second and third apertures disposed on the first face surface of the first body and spaced 180° degrees apart, the second and third apertures carrying respective first and second springs.

5. The coupling of claim 1 further comprising a groove rimming the first face surface of the first body.

6. The coupling of claim 1 further comprising a second face surface axially opposite and facing away from the first face surface, wherein the second face surface extends radially from the coupling axis.

7. The coupling of claim 6 wherein the second face surface of the first body includes an arcuate extension rimming at least a portion of the second face surface to form the first recess.

8. The coupling of claim 7 wherein the arcuate extension includes at least first and second radially outward angled ends angled in a radial direction away from the coupling axis and bounding the first recess.

9. The coupling of claim 6 wherein the second face surface of the first body includes an axially angled section slanting towards the first face surface of the first body.

10. The coupling of claim 1 wherein the second body includes an aperture extending therethrough, the aperture opening through a first face surface of the second body and a second face surface of the second body.

11. The coupling of claim 10 wherein the first face surface of the second body includes at least first and second detents spaced 180° degrees apart.

12. The coupling of claim 10 wherein the aperture extending through the second body includes a stepped portion, and an axial length extending from the first face surface of the second body to the stepped portion, wherein the axial length is less than an axial length of the insert member of the first body.

13. The coupling of claim 10 further comprising a groove rimming the first face surface of the second body.

14. The coupling of claim 10 wherein the second face surface of the second body includes an arcuate extension extending away from at least a portion of the second face surface of the second body to form the second recess.

15. The coupling of claim 14 wherein the arcuate extension includes at least first and second radially outward angled ends angled in a radial direction away from the coupling axis and bounding the second recess.

16. The coupling of claim 15 wherein the second face surface of the second body includes an axially angled section slanting towards the first face surface of the second body.

17. A coupling of a pump connecting a plunger and a plunger adaptor, the coupling comprising:

a first body having a first recess into which a plunger flange of the plunger is received, the first body including a first face surface axially opposite and facing away from a second face surface, and an insert member extending axially away from the first face surface of the first body; and

a second body having a second recess into which a plunger adaptor flange of the plunger adaptor is received, the second body including a first face surface axially opposite and facing away from a second face surface, and a first aperture extending from the first face surface of the second body, through the second body to the second face surface of the second body;

wherein the insert member of the first body is disposed within the first aperture of the second body to couple the first body to the second body,

wherein, when coupled together, the first body is separated from the second body by a first distance,

wherein, in an installation orientation, the first recess and the second recess face in a first direction with a first angular orientation relative to a coupling axis,

wherein, in a locked orientation, the first recess faces in the first direction with the first angular orientation relative to the coupling axis, and the second recess faces in a second direction with a second angular orientation relative to the coupling axis, the first angular orientation is 180° opposite the second angular orientation, and

wherein the first body and the second body are adjusted 180° relative to one another to move from the installation orientation to the locked orientation, and wherein said plunger flange is in said first body recess and said adaptor flange is in said second body recess when said first body and second body are in said installation orientation and in said locked orientation.

18. The coupling of claim 17 further comprising a threaded bolt extending through the second face surface of the second body into the first aperture of the second body and through the insert member of the first body.

19. The coupling of claim 18 further comprising a washer adjacent a head of the threaded bolt, wherein the washer abuts against a stepped portion of the first aperture of the second body.

20. The coupling of claim 17 further comprising at least first and second locator balls disposed between the first body and the second body.

21. The coupling of claim 20 wherein the first and second locator balls are carried by springs.

22. The coupling of claim 17 further comprising an O-ring disposed between the first body and the second body.

23. An assembly in a pump, said assembly comprising:

a frame, said frame defining a well, said well having an open end;

a plunger, said plunger having a first end with an end surface, said plunger having a second end with an end surface, said plunger linearly movable for a stroke length between a first position, wherein said plunger is at the beginning of a discharge stroke, and a second position, wherein said plunger is at an end of a discharge stroke, said plunger accessible from said well;

a plunger adaptor, said plunger adaptor having a first end with an end surface and a second end, said plunger adaptor linearly movable between a first position, wherein said plunger adaptor is at a beginning of said discharge stroke and a second position, wherein said plunger is at an end of said discharge stroke, said plunger adaptor accessible from said well; and

a space is between said plunger and said plunger adaptor; said space having a longitudinal length, said longitudinal length is measured along a longitudinal axis of the plunger;

an orientation selected from a group of orientations consisting of an assembled orientation wherein a coupling connects said plunger to said adaptor, and said coupling spans the longitudinal length; and a partially disassembled orientation wherein said plunger and plunger adaptor are not connected;

and wherein said longitudinal length of said space is at least great enough when said plunger is in said first position to enable removal of said second plunger end out of said well open end, when said pump assembly is in said partially disassembled orientation, and when said plunger adaptor first end is in said well.

24. The assembly of claim 23 wherein said coupling comprises:

a first body having a first face surface axially spaced from a second face surface;

an extension rims a portion of said first body second face surface;

a recess formed by said extension and said second face surface;

a second body having a first face surface and a second face surface;

an extension rims a portion of said second body second face surface;

a recess formed by said extension which rims said second body second face surface and said second body second face surface;

a longitudinal length between said second face surfaces;

a locator assembly forming a portion of said coupling;

wherein said first body is rotatably coupled to said second body, said first face surface of said first body faces said first face surface of said second body, said first face surfaces are rotatable relative to each about an axis of said coupling between a first position and a second position, said locator assembly signaling when said face surfaces are rotated from said first position to said second position; and

wherein said second position is a position which locks the coupling to the plunger and plunger adaptor when said assembly is in the assembled orientation and said first position is a position which allows removal of the coupling from the plunger and plunger adaptor when said assembly is in the assembled orientation, and when said assembly is in said assembled orientation and said coupling is rotated to be in said first position and rotated to be in said second position a flange at said plunger first end is in said recess formed by said extension and said second face surface of said first body and a flange at said adaptor first end is in said recess formed by said extension and second face surface of said second body.