Posted by mEl on March 30, 2015 at 19:56:27 from (96.243.113.64):
In Reply to: Hydraulic valves posted by J. Schwiebert on March 30, 2015 at 18:48:08:
Heathouser has it exactly right, I put the very response on the Case forum to no avail, people will do it anyway, if the relief is in the first section and the second section is deadheaded the relief valve is effectively taken out of the system as pressurised oil backs up against the backside of the main relief, rendering it inefective, A power beyond type valve with individual drain lines is an absolute necessity, you cannot safely series garden variety valves in series , the exception to this would be to install a relief valve block with a drain prior to any valve stack, even then you have areas inside the valves that are handling pressures they were not designed for as these areas would normally be going to sump, now with the pressure flo through the whole valve assemble sees high pressure. Its not as simple as just throwing some valves together
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