Sounds like your buffer will be ok, the bigger the better. it will be one of those things to test with your compressor see how long it takes to get the system up to pressure. Hook it up to the ram, fire and retract the ram once then switch on the compressor timing how long it takes to get back up to pressure. see circuit
Dump Valve & PRV
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Compressor - Buffer - valve (5/2 probably) - ram
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Pressure Gauge
I think that the compressor fitting is 1/8 BSP
