Ultrahigh pressure generator

An ultrahigh pressure generator, comprising:

• a pressure intensifier configured to discharge a fluid, the pressure intensifier including
• a piston configured to be driven by a working medium,
• a double-acting drive cylinder having a first compartment and a second compartment that are separated by the piston,
• a high-pressure cylinder configured to discharge the fluid, and
• a plunger configured to reciprocate in the high-pressure cylinder together with the piston;
• a closed-circuit working medium pump having a first port and a second port being an inlet port and an outlet port for the working medium, the closed-circuit working medium pump being configured to drive the pressure intensifier by sucking and discharging the working medium from and to the first compartment and the second compartment respectively through the first port and the second port;
• a first working medium channel connecting the first compartment and the first port;
• a second working medium channel connecting the second compartment and the second port;
• a tank configured to store the working medium;
• a feed circuit configured to feed the working medium from the tank to the first working medium channel and the second working medium channel;
• a collector configured to collect the working medium from the first working medium channel and the second working medium channel into the tank;
• and
• a low-pressure selector configured to select, when the pressure of the working medium discharged toward the first compartment or the second compartment exceeds a predetermined threshold, the working medium discharged from one of the first compartment and the second compartment, and direct the selected working medium to the collector.