I'm looking for a source to purchase solenoid cartridge valves with ratings greater than 5 kpsi. Any help or pointing in right direction is greatly appreciated.
Sauer Danfoss goes to 5080 with some solutions to 6000 for oil hydraulic. For air see Cunico.
You do not specify purpose, fluid (air or oil hydraulic (guessing hydraulic), application, on/off or diverting, flow requirement, operation time or other technical details.
More details could perhaps give a more helpful answer.