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

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.

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.