Piston pumps work on reciprocating positive-displacement principle. When the first cycle takes place, the lubricant gets sucked through an inlet valve with the help of a piston traveling in one cylinder. This will then be discharged through the outlet valve. Once the first cycle is complete, relieve the pressure on the actuation pressure, so the pump is ready to suck in more lubricant. The connected distributors will then be reversed and refilled for the next cycle. The piston pumps in the centralized lubrication systems that contribute to total loss lubrication systems. Depending on the system and lubricant used, the technical specifications of the pumps vary. As for the piston pumps, they can be either installed separately or as part of the lubricant reservoir. They can also be flange-mounted inside the lubricant reservoir.