The valve listed as safety valve is the relief valve, regulator valve is the unloading circuit which operates in conjunction with the screen orfice and the regulator land on control spools to return system to low neutral pressure . Same basic idea as 300, 400 560 etc. The extra valve to operate hitch is a flow through type ported through the base to utilize same relief valve as rest of system. You can hook a gauge into the line going to hitch to check relief valve. I would advise using a flow rater or a valve in line with the gauge so you could very gradually restrict flow just in case some one installed something wrong in relief (safety) valve giving you too much pressure. I don't know pressure off the top of my head but I am thinking 1200 psi.
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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