Hi, Woodfar here taking in all the advice and mulling it around in my head. You may understand a little better if ou know the popper term is relief valve opposed to release valve.and it is to protect from blowing the valve seals out and the packing from the cylinder. It is adjusted to around 2500 psi, ,depending on need. When the pressure reaches more than 2500 psi the relief, or bypass valve will open and let the extra fluid go back to the tank instead of blowing the cylinder apart. Do know a little about hydraulics and have that covered. Sorry if I misled anyone with the way I asked the question. Hope others get a better understanding of the relief valve. Thanks for all the responses.