This isn’t designed for low pressure use, and would be an expensive waist for such applications. It takes at least 3 intensifiers for optimal operation 60,000 psi, and 4 if you don’t want to replace seals every week. You could get by 2, but overspeed becomes an issue and you will work the system to death trying to keep up. With 1 pump running you could reach 30,000 psi with bursts of 50,000, but then you run into problems with the seals. So, why not turn the 1 pump down? Well, it’s not that simple! The intensifier pushes softened water, but use’s regular water for cooling the massive hydraulic system that’s comprised of a giant electric motor, pump, with manifolds, bleed down valves, etc… that are all designed to operate at a specific spec to push 60,000+ psi. The only way that I can see this system working properly is if the whole system is made smaller at perhaps 1/10 the scale of the current. My advice is to invest in a direct drive rotary pump which is more efficient at lower pressure with less maintenance involved.

For this kind of pressure, a pressure washer is probably the cheapest thing you could get. If you need higher pressures (e.g. 2000bar), depending on the flow rate you could use a common rail pump from a junkyard. It doesn't allow for continuous operation though, you'll get bursts of high pressure, but this may be fine if you don't mind going slower. If you want to absolutely use that system, the easiest besides getting a preassembled one is to use a big and a small cylinder, with the big one using the pumped fluid, and the smaller diameter one pumping for high pressure, the ratio of volume between the 2 mulriplies the pressure and divides the flow rate (with some loss). If you have a lathe you can relatively easily make one. Though you could as well use a gear reduction on the pump motor and actuate the high pressure pump directly, or use a 2 stage pump (where the lower pressure pump feeds directly into the higher pressure one), which is why it's not used that much until 10k psi+ Another way you can get high pressure if you don't need a constant duty cycle is through boiling, you basically use a pressure vessel, heat it and use a valve that opens as the pressure is reached, and then use the steam to actuate the pump, putting the exhaust back in the reservoir. That's less efficient than using a motor, but you can use any fuel or even a lens/mirror array to power it.

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