You ar eboth right. When a piston is leaking it makes a lot more pressure in the system becuase the rod diameter is so small. This higher pressure will force it's way past a pretty good valve. It may also pop the thermal relief on some control valves. A leaking piston with the cylinder under load will overpressure something, sometimes the rod packing.
In reverse, this is the way to move a lightly loaded cylinder fast: you rig it up to apply pressure to both sides of the cylinder and it will extend based on the rod volume displaced. It moves faster because the cylinder, not under load, moves at the pump displacement rate, not because it has pressure on it.
A blocked-in cold system which warms up will try to move the cylinder the same way.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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