Common plunger for a linear actuated pump

A linear pump assembly comprising:

• a cylinder housing defining a cylinder chamber having first and second ends disposed along a longitudinal axis containing a cylinder piston;
• first and second plunger housings coupled to the first and second ends of the cylinder housing respectively and the first plunger housing defining a plunger chamber in linear alignment with the longitudinal axis of the cylinder chamber,
• the first plunger housing being configured to contain at least a portion of a first plunger-cylinder rod securely coupled to the cylinder piston, and
• the second plunger housing being configured to contain at least a portion of a second plunger-cylinder rod securely coupled to the cylinder piston;
• and
• first and second fluid ends coupled to the first and second plunger housings respectively,
• the first fluid end housing a suction valve and a discharge valve,
• the cylinder piston being configured to be displaced between first and second operational end points by a pressurized hydraulic fluid circulating in the cylinder housing to cause the first plunger-cylinder rod to be displaced and cause a frac fluid to be pumped in through the suction valve and out through the discharge valve, and
• the first plunger-cylinder rod being configured to contact the frac fluid in the first fluid end, wherein the first plunger-cylinder rod comprises:
• a rod having a first protruding nub and a second protruding nub, the second protruding nub being engaged with a cavity of the cylinder piston;
• a sleeve configured to enclose the rod;
• a washer configured to overlay and engage a first end of the sleeve and the first protruding nub;
• and
• a nut configured to engage the first protruding nub, secure the sleeve in place, and maintain a second end of the sleeve tightly abutting the cylinder piston.

A linear pump assembly comprising:

• a cylinder piston disposed in a cylinder chamber defined within a cylinder housing having first and second ends;
• a first plunger-cylinder rod securely coupled to a first end of the cylinder piston and configured to be disposed in a first plunger chamber defined within a first plunger housing in linear alignment with the cylinder housing;
• a second plunger-cylinder rod securely coupled to a second end of the cylinder piston and configured to be disposed in a second plunger chamber defined within a second plunger housing in linear alignment with the cylinder housing and the first plunger housing;
• and
• first and second fluid ends coupled to the first and second plunger housings respectively,
• the first and second fluid ends each housing a suction valve and a discharge valve,
• the cylinder piston being configured for reciprocating displacement between first and second operational end points by a pressurized hydraulic fluid circulating in the cylinder housing, causing the first and second plunger-cylinder rods to be displaced within the respective plunger housings, and further causing a frac fluid to be pumped in through the first and second fluid ends in an alternating manner, and
• the first plunger-cylinder rod being configured to contact the frac fluid in the first fluid end, wherein the first plunger-cylinder rod comprises:
• a rod having a first protruding threaded nub engaged with a threaded cavity of the cylinder piston;
• and
• a threaded nut configured to engage a second protruding threaded nub of the rod and maintain the first plunger-cylinder rod tightly abutting the cylinder piston.