Burkert is a brand. They mainly do valves and such.
1 type of valve in their program is the Burkert 5405. the 1/2bsp (or simular sized NPT one) is one of the few easely available 2/2 valves with good flow and reasonable cost that can switch 750 psi.

It seems you want a basic Gravity style setup. Like used in a lot of heavy and feather flippers.

For a basic setup you need
CO2 storage bottle- buffertank (3times ram volume adviced)-1000psi Pressure relieve device (a valve that opens at 1000psi and vents the overpressure to the open air) valve to fire the ram (the formentioned burkert 5405- amount of valves used depend on ram size, below 70mm bore I say 1 above 2 or more).Valve to relieve the CO2 cought in the ram
A ram of suitable size and then a frame that can take the forces involved.

You can ask around, enough teams have experience.
Team Beast springs to mind.