Mecelec Design has refurbished a Hyjet power pack for a leading aerospace supplier. The original power pack wasn’t big enough and didn’t have all of the desired functionality.
There was a requirement to double the flow rate, have remote pressure control of the main pumps and also have a 10,000 psi proof pressure test functionality.
To double the flow rate, an additional high pressure pump was added therefore the refur-bished power pack had two high pressure pumps running in parallel.
The remote pressure control functionality was achieved by using pressure compensated pumps with proportional pressure limiting valves on the pilot circuit. The proportional valves were controlled by the PLC in a closed loop PID circuit with a downstream pres-sure transducer.
Hyjet is a very aggressive fluid and therefore the frame is raw stainless steel and all the hydraulic seals need to be EPDM.