Posted by Heat Houser on March 30, 2015 at 17:40:54 from (192.43.65.245):
In Reply to: Re: Hydraulic valves posted by pete 23 on March 30, 2015 at 11:15:06:
Let's look at extending a cylinder. The down stream valve(s) will have the return oil coming back from the cylinder to use as it's supply. Open center in series is very dangerous unless they are power beyond. When you are extending a cylinder and the rod side oil is returning. In this case, the cylinder can be acting as a pressure intensifier due to the area difference between the piston and the rod. The second valve will be exposed to this pressure if it is operated. The second area of concern, the relief in the first valve dumps to the tank port which feeds the next valve. If both valves are operated, the work pressures will stack and you may crack housings, blow up pumps, blow hoses.
Do not plumb open center valves in series unless you use power beyond. Then each valve has it's own tank line and the pressures cannot stack.
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