Inlet Valve just needs to be rated to a minimum of 1000 WOG ...1000 psi Water Oil or Gas... material matters not.
The low pressure actuator needs to be rated so as to be able to overcome the valves initial torque and fully open it fast.
L.P. Regulator ONLY.
5/2 Valve sized to suit your low pressure ram.
H.P. Ram Exhaust valve ...A std 5404 Burkert or there are plenty of 1/4 2/2 valves around that have the correct rating.
Id suggest investigating a T port ball valve... this could give both inlet and exhaust.
You can use any pipe that you like ...just make sure it has the correct pressure rating.
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