No problems with burkets at all, but I doubt the solenoid is the only factor limiting the pressure. My only problem is 50 Bar components operating at upto 69 bar.

Without knowing the design pressure of the assembly, the materal grades used and relative internal diameters & thicknesses - randomly choosing a test pressure could be dangerous. If you exceed the yield limits of the metals used, they will probably pass hydro test but may fail in service at some later date. But I agree that any valves should be tested if used above their intended design pressure - although I wouldn't want to provide the guarentee in case one did fail. Also I wouldn't test the units to a pressure any higher than is necessary.

Not being picky or arsey but safety is safety. I heard a horror story recently from a visting assessor coming in for a witnessed hydro test, he took a look at the assembly and pointed at the drain plugs we were using. He then went on to tell me how a man lost his life during a pressure test all thanks to a 1/4 BSPT plug that stripped its threads. Could you imagine having to live with that all for the sake of a hydro test?

For your own safety, if the components in the system are rated for less than the relief valve then get them tested.