Pressurization system for high pressure processing system

Pressurization unit for use in processing equipment handling high pressure fluid, where the pressurization unit comprises at least one inlet and an outlet, the pressurization unit being adapted to receive a feed fluid at a feed pressure level at the inlet, being adapted to isolate the received feed fluid from the inlet and from the outlet and being adapted to increase the pressure of the feed fluid to a higher predetermined level and further being adapted to output the fluid through the outlet into the high pressure process while still isolated towards the inlet, the unit comprising an actuated valve at the inlet and an actuated valve at the outlet and further a pressurization device between the inlet valve and the outlet valve, wherein

• the pressurization device includes a pump including
• first, second, and third cylinders, and
• first, second, and third pistons attached to a common piston rod and driven inside the first, second, and third cylinders, respectively, wherein the inlet valve and the outlet valve are fluidly connected to a first cylinder volume inside the first cylinder defined by a position of the first piston, wherein an energy storage is fluidly connected via a control valve to a second cylinder volume inside the second cylinder defined by a position of the second piston, wherein a supply of pressure control fluid is fluidly connected via another control valve to a third cylinder volume inside the third cylinder defined by a position of the third piston, wherein the pump is configured to transfer energy from a flow of energy recovery fluid from the energy storage through the second cylinder volume to the flow of the feed fluid through the first cylinder volume, and transfer energy from the flow of the pressure control fluid through the third cylinder volume to the flow of the feed fluid through the first cylinder volume, in order to increase the pressure of the feed fluid to the higher predetermined level, and
• within a pump cycle of the pressurization device during which each of the inlet valve and the outlet valve alternates between open and closed states, the inlet valve after having allowed inlet of a feed stream is closed for a period before the outlet valve is opened, hereby allowing pressure to be generated by the pressurization device and the outlet valve is closed for a period before the inlet valve is opened, hereby allowing pressure to be reduced in the pressurization device, such that the inlet valve is opened a different amount of time than the outlet valve during the pump cycle, wherein the open and closed states of both the inlet and outlet valves are controlled by control signals issued by a controller, and
• a position indicator is provided indicating the cycle position of the pressurization device and being adapted to provide a control signal for opening and closing of each of the inlet and outlet valves in the pressurization unit, the pressurization unit further comprising a control system, where the control system is adapted to allow opening of the valves when a certain maximum pressure difference is present between either side of the valve to be opened.