A multi-piston pump includes a first pump configured to execute a discharge stroke, a suction stroke, a compression stroke, a hold, and a changeover, a second pump independent from the first pump, the second pump being configured to execute a discharge stroke, a suction stroke, a compression stroke, a hold, and the changeover; and a controller that coordinates operation of the first pump and the second pump so that while the first pump is executing the discharge stroke, the second pump is executing the suction stroke, the compression stroke, and the hold, and the first pump and the second pump execute the changeover simultaneously and while the second pump is executing the discharge stroke, the first pump is executing the suction stroke, the compression stroke, and the hold and the first pump and the second pump execute the changeover simultaneously

A multi-piston pump includes a first pump having a first linear position sensor and a first pressure sensor, a second pump independent from the first pump, the second pump having a second linear position sensor and a second pressure sensor, a discharge pipe connected to the first pump and the second pump, a user interface, and a controller configured to coordinate operations of the first pump and the second pump based upon sensor inputs to execute, in response to input received by the controller from the user interface, at least one diagnostic test from a group of diagnostic tests that includes a poppet seat leak pressure calibration test, a poppet seat leak test, a cylinder position test, a hydraulic pump leak down test, and a hydraulic piston seal test, and display a result of the diagnostic test on the user interface.

The hydraulic power increaser system includes: a power source (in this case, an electric motor), a hydraulic pump, a relief valve for safety, hydraulic conductors, a liquid fluid reservoir, 4-way directional valves operated by servo motors, and a digital/analog control system in conjunction with inductive proximity sensors located at the ends of the cylinders or boosters. Two boosters or cylinders are configured in series in the same line, each with an internal plunger that moves and displaces the fluid contained in the cylinders or boosters linearly. Hydraulic actuators or motors perform the work by transforming the energy of the system. All these aforementioned elements constitute the main block, which acts as a power source for the next secondary block, which contains the same elements as the main block except for the power source (in this case, an electric motor).

A hydraulic cylinder, in particular for a hydrogen tank pressurization installation, including a cylindrical body of longitudinal axis having a first low-pressure cylindrical body portion and a second high-pressure cylindrical body portion, a piston being mounted in the first cylindrical body portion and being mounted at a first end of a piston rod slidably extending in the second cylindrical body portion. A second end of the rod opposite the first end carries a removable cartridge slidably sealed in the second part of the cylindrical body, the second part of the cylindrical body being sealed by a removable shutter member arranged longitudinally opposite the removable cartridge.